Provided by: slurm-client_21.08.5-2ubuntu2_amd64 
NAME
srun - Run parallel jobs
SYNOPSIS
srun [OPTIONS(0)... [executable(0) [args(0)...]]] [ : [OPTIONS(N)...]] executable(N)
[args(N)...]
Option(s) define multiple jobs in a co-scheduled heterogeneous job. For more details
about heterogeneous jobs see the document
https://slurm.schedmd.com/heterogeneous_jobs.html
DESCRIPTION
Run a parallel job on cluster managed by Slurm. If necessary, srun will first create a
resource allocation in which to run the parallel job.
The following document describes the influence of various options on the allocation of
cpus to jobs and tasks.
https://slurm.schedmd.com/cpu_management.html
RETURN VALUE
srun will return the highest exit code of all tasks run or the highest signal (with the
high-order bit set in an 8-bit integer -- e.g. 128 + signal) of any task that exited with
a signal.
The value 253 is reserved for out-of-memory errors.
EXECUTABLE PATH RESOLUTION
The executable is resolved in the following order:
1. If executable starts with ".", then path is constructed as: current working directory /
executable
2. If executable starts with a "/", then path is considered absolute.
3. If executable can be resolved through PATH. See path_resolution(7).
4. If executable is in current working directory.
Current working directory is the calling process working directory unless the --chdir
argument is passed, which will override the current working directory.
OPTIONS
--accel-bind=<options>
Control how tasks are bound to generic resources of type gpu and nic. Multiple
options may be specified. Supported options include:
g Bind each task to GPUs which are closest to the allocated CPUs.
n Bind each task to NICs which are closest to the allocated CPUs.
v Verbose mode. Log how tasks are bound to GPU and NIC devices.
This option applies to job allocations.
-A, --account=<account>
Charge resources used by this job to specified account. The account is an
arbitrary string. The account name may be changed after job submission using the
scontrol command. This option applies to job allocations.
--acctg-freq=<datatype>=<interval>[,<datatype>=<interval>...]
Define the job accounting and profiling sampling intervals in seconds. This can be
used to override the JobAcctGatherFrequency parameter in the slurm.conf file.
<datatype>=<interval> specifies the task sampling interval for the jobacct_gather
plugin or a sampling interval for a profiling type by the acct_gather_profile
plugin. Multiple comma-separated <datatype>=<interval> pairs may be specified.
Supported datatype values are:
task Sampling interval for the jobacct_gather plugins and for task profiling
by the acct_gather_profile plugin.
NOTE: This frequency is used to monitor memory usage. If memory limits
are enforced the highest frequency a user can request is what is
configured in the slurm.conf file. It can not be disabled.
energy Sampling interval for energy profiling using the acct_gather_energy
plugin.
network Sampling interval for infiniband profiling using the
acct_gather_interconnect plugin.
filesystem Sampling interval for filesystem profiling using the
acct_gather_filesystem plugin.
The default value for the task sampling interval is 30 seconds. The default value
for all other intervals is 0. An interval of 0 disables sampling of the specified
type. If the task sampling interval is 0, accounting information is collected only
at job termination (reducing Slurm interference with the job).
Smaller (non-zero) values have a greater impact upon job performance, but a value
of 30 seconds is not likely to be noticeable for applications having less than
10,000 tasks. This option applies to job allocations.
--bb=<spec>
Burst buffer specification. The form of the specification is system dependent.
Also see --bbf. This option applies to job allocations. When the --bb option is
used, Slurm parses this option and creates a temporary burst buffer script file
that is used internally by the burst buffer plugins. See Slurm's burst buffer guide
for more information and examples:
https://slurm.schedmd.com/burst_buffer.html
--bbf=<file_name>
Path of file containing burst buffer specification. The form of the specification
is system dependent. Also see --bb. This option applies to job allocations. See
Slurm's burst buffer guide for more information and examples:
https://slurm.schedmd.com/burst_buffer.html
--bcast[=<dest_path>]
Copy executable file to allocated compute nodes. If a file name is specified, copy
the executable to the specified destination file path. If the path specified ends
with '/' it is treated as a target directory, and the destination file name will be
slurm_bcast_<job_id>.<step_id>_<nodename>. If no dest_path is specified and the
slurm.conf BcastParameters DestDir is configured then it is used, and the filename
follows the above pattern. If none of the previous is specified, then --chdir is
used, and the filename follows the above pattern too. For example, "srun
--bcast=/tmp/mine -N3 a.out" will copy the file "a.out" from your current directory
to the file "/tmp/mine" on each of the three allocated compute nodes and execute
that file. This option applies to step allocations.
--bcast-exclude={NONE|<exclude_path>[,<exclude_path>...]}
Comma-separated list of absolute directory paths to be excluded when autodetecting
and broadcasting executable shared object dependencies through --bcast. If the
keyword "NONE" is configured, no directory paths will be excluded. The default
value is that of slurm.conf BcastExclude and this option overrides it. See also
--bcast and --send-libs.
-b, --begin=<time>
Defer initiation of this job until the specified time. It accepts times of the
form HH:MM:SS to run a job at a specific time of day (seconds are optional). (If
that time is already past, the next day is assumed.) You may also specify
midnight, noon, fika (3 PM) or teatime (4 PM) and you can have a time-of-day
suffixed with AM or PM for running in the morning or the evening. You can also say
what day the job will be run, by specifying a date of the form MMDDYY or MM/DD/YY
YYYY-MM-DD. Combine date and time using the following format
YYYY-MM-DD[THH:MM[:SS]]. You can also give times like now + count time-units, where
the time-units can be seconds (default), minutes, hours, days, or weeks and you can
tell Slurm to run the job today with the keyword today and to run the job tomorrow
with the keyword tomorrow. The value may be changed after job submission using the
scontrol command. For example:
--begin=16:00
--begin=now+1hour
--begin=now+60 (seconds by default)
--begin=2010-01-20T12:34:00
Notes on date/time specifications:
- Although the 'seconds' field of the HH:MM:SS time specification is allowed by
the code, note that the poll time of the Slurm scheduler is not precise enough to
guarantee dispatch of the job on the exact second. The job will be eligible to
start on the next poll following the specified time. The exact poll interval
depends on the Slurm scheduler (e.g., 60 seconds with the default sched/builtin).
- If no time (HH:MM:SS) is specified, the default is (00:00:00).
- If a date is specified without a year (e.g., MM/DD) then the current year is
assumed, unless the combination of MM/DD and HH:MM:SS has already passed for that
year, in which case the next year is used.
This option applies to job allocations.
-D, --chdir=<path>
Have the remote processes do a chdir to path before beginning execution. The
default is to chdir to the current working directory of the srun process. The path
can be specified as full path or relative path to the directory where the command
is executed. This option applies to job allocations.
--cluster-constraint=<list>
Specifies features that a federated cluster must have to have a sibling job
submitted to it. Slurm will attempt to submit a sibling job to a cluster if it has
at least one of the specified features.
-M, --clusters=<string>
Clusters to issue commands to. Multiple cluster names may be comma separated. The
job will be submitted to the one cluster providing the earliest expected job
initiation time. The default value is the current cluster. A value of 'all' will
query to run on all clusters. Note the --export option to control environment
variables exported between clusters. This option applies only to job allocations.
Note that the SlurmDBD must be up for this option to work properly.
--comment=<string>
An arbitrary comment. This option applies to job allocations.
--compress[=type]
Compress file before sending it to compute hosts. The optional argument specifies
the data compression library to be used. The default is BcastParameters
Compression= if set or "lz4" otherwise. Supported values are "lz4". Some
compression libraries may be unavailable on some systems. For use with the --bcast
option. This option applies to step allocations.
-C, --constraint=<list>
Nodes can have features assigned to them by the Slurm administrator. Users can
specify which of these features are required by their job using the constraint
option. Only nodes having features matching the job constraints will be used to
satisfy the request. Multiple constraints may be specified with AND, OR, matching
OR, resource counts, etc. (some operators are not supported on all system types).
Supported constraint options include:
Single Name
Only nodes which have the specified feature will be used. For example,
--constraint="intel"
Node Count
A request can specify the number of nodes needed with some feature by
appending an asterisk and count after the feature name. For example,
--nodes=16 --constraint="graphics*4 ..." indicates that the job requires 16
nodes and that at least four of those nodes must have the feature
"graphics."
AND If only nodes with all of specified features will be used. The ampersand is
used for an AND operator. For example, --constraint="intel&gpu"
OR If only nodes with at least one of specified features will be used. The
vertical bar is used for an OR operator. For example,
--constraint="intel|amd"
Matching OR
If only one of a set of possible options should be used for all allocated
nodes, then use the OR operator and enclose the options within square
brackets. For example, --constraint="[rack1|rack2|rack3|rack4]" might be
used to specify that all nodes must be allocated on a single rack of the
cluster, but any of those four racks can be used.
Multiple Counts
Specific counts of multiple resources may be specified by using the AND
operator and enclosing the options within square brackets. For example,
--constraint="[rack1*2&rack2*4]" might be used to specify that two nodes
must be allocated from nodes with the feature of "rack1" and four nodes must
be allocated from nodes with the feature "rack2".
NOTE: This construct does not support multiple Intel KNL NUMA or MCDRAM
modes. For example, while --constraint="[(knl&quad)*2&(knl&hemi)*4]" is not
supported, --constraint="[haswell*2&(knl&hemi)*4]" is supported.
Specification of multiple KNL modes requires the use of a heterogeneous job.
Brackets
Brackets can be used to indicate that you are looking for a set of nodes
with the different requirements contained within the brackets. For example,
--constraint="[(rack1|rack2)*1&(rack3)*2]" will get you one node with either
the "rack1" or "rack2" features and two nodes with the "rack3" feature. The
same request without the brackets will try to find a single node that meets
those requirements.
NOTE: Brackets are only reserved for Multiple Counts and Matching OR syntax.
AND operators require a count for each feature inside square brackets (i.e.
"[quad*2&hemi*1]").
Parenthesis
Parenthesis can be used to group like node features together. For example,
--constraint="[(knl&snc4&flat)*4&haswell*1]" might be used to specify that
four nodes with the features "knl", "snc4" and "flat" plus one node with the
feature "haswell" are required. All options within parenthesis should be
grouped with AND (e.g. "&") operands.
WARNING: When srun is executed from within salloc or sbatch, the constraint value
can only contain a single feature name. None of the other operators are currently
supported for job steps.
This option applies to job and step allocations.
--container=<path_to_container>
Absolute path to OCI container bundle.
--contiguous
If set, then the allocated nodes must form a contiguous set.
NOTE: If SelectPlugin=cons_res this option won't be honored with the topology/tree
or topology/3d_torus plugins, both of which can modify the node ordering. This
option applies to job allocations.
-S, --core-spec=<num>
Count of specialized cores per node reserved by the job for system operations and
not used by the application. The application will not use these cores, but will be
charged for their allocation. Default value is dependent upon the node's
configured CoreSpecCount value. If a value of zero is designated and the Slurm
configuration option AllowSpecResourcesUsage is enabled, the job will be allowed to
override CoreSpecCount and use the specialized resources on nodes it is allocated.
This option can not be used with the --thread-spec option. This option applies to
job allocations.
NOTE: This option may implicitly impact the number of tasks if -n was not
specified.
--cores-per-socket=<cores>
Restrict node selection to nodes with at least the specified number of cores per
socket. See additional information under -B option above when task/affinity plugin
is enabled. This option applies to job allocations.
--cpu-bind=[{quiet|verbose},]<type>
Bind tasks to CPUs. Used only when the task/affinity or task/cgroup plugin is
enabled. NOTE: To have Slurm always report on the selected CPU binding for all
commands executed in a shell, you can enable verbose mode by setting the
SLURM_CPU_BIND environment variable value to "verbose".
The following informational environment variables are set when --cpu-bind is in
use:
SLURM_CPU_BIND_VERBOSE
SLURM_CPU_BIND_TYPE
SLURM_CPU_BIND_LIST
See the ENVIRONMENT VARIABLES section for a more detailed description of the
individual SLURM_CPU_BIND variables. These variable are available only if the
task/affinity plugin is configured.
When using --cpus-per-task to run multithreaded tasks, be aware that CPU binding is
inherited from the parent of the process. This means that the multithreaded task
should either specify or clear the CPU binding itself to avoid having all threads
of the multithreaded task use the same mask/CPU as the parent. Alternatively, fat
masks (masks which specify more than one allowed CPU) could be used for the tasks
in order to provide multiple CPUs for the multithreaded tasks.
Note that a job step can be allocated different numbers of CPUs on each node or be
allocated CPUs not starting at location zero. Therefore one of the options which
automatically generate the task binding is recommended. Explicitly specified masks
or bindings are only honored when the job step has been allocated every available
CPU on the node.
Binding a task to a NUMA locality domain means to bind the task to the set of CPUs
that belong to the NUMA locality domain or "NUMA node". If NUMA locality domain
options are used on systems with no NUMA support, then each socket is considered a
locality domain.
If the --cpu-bind option is not used, the default binding mode will depend upon
Slurm's configuration and the step's resource allocation. If all allocated nodes
have the same configured CpuBind mode, that will be used. Otherwise if the job's
Partition has a configured CpuBind mode, that will be used. Otherwise if Slurm has
a configured TaskPluginParam value, that mode will be used. Otherwise automatic
binding will be performed as described below.
Auto Binding
Applies only when task/affinity is enabled. If the job step allocation
includes an allocation with a number of sockets, cores, or threads equal to
the number of tasks times cpus-per-task, then the tasks will by default be
bound to the appropriate resources (auto binding). Disable this mode of
operation by explicitly setting "--cpu-bind=none". Use
TaskPluginParam=autobind=[threads|cores|sockets] to set a default cpu
binding in case "auto binding" doesn't find a match.
Supported options include:
q[uiet]
Quietly bind before task runs (default)
v[erbose]
Verbosely report binding before task runs
no[ne] Do not bind tasks to CPUs (default unless auto binding is applied)
rank Automatically bind by task rank. The lowest numbered task on each
node is bound to socket (or core or thread) zero, etc. Not supported
unless the entire node is allocated to the job.
map_cpu:<list>
Bind by setting CPU masks on tasks (or ranks) as specified where
<list> is <cpu_id_for_task_0>,<cpu_id_for_task_1>,... CPU IDs are
interpreted as decimal values unless they are preceded with '0x' in
which case they interpreted as hexadecimal values. If the number of
tasks (or ranks) exceeds the number of elements in this list,
elements in the list will be reused as needed starting from the
beginning of the list. To simplify support for large task counts,
the lists may follow a map with an asterisk and repetition count.
For example "map_cpu:0x0f*4,0xf0*4".
mask_cpu:<list>
Bind by setting CPU masks on tasks (or ranks) as specified where
<list> is <cpu_mask_for_task_0>,<cpu_mask_for_task_1>,... The
mapping is specified for a node and identical mapping is applied to
the tasks on every node (i.e. the lowest task ID on each node is
mapped to the first mask specified in the list, etc.). CPU masks are
always interpreted as hexadecimal values but can be preceded with an
optional '0x'. If the number of tasks (or ranks) exceeds the number
of elements in this list, elements in the list will be reused as
needed starting from the beginning of the list. To simplify support
for large task counts, the lists may follow a map with an asterisk
and repetition count. For example "mask_cpu:0x0f*4,0xf0*4".
rank_ldom
Bind to a NUMA locality domain by rank. Not supported unless the
entire node is allocated to the job.
map_ldom:<list>
Bind by mapping NUMA locality domain IDs to tasks as specified where
<list> is <ldom1>,<ldom2>,...<ldomN>. The locality domain IDs are
interpreted as decimal values unless they are preceded with '0x' in
which case they are interpreted as hexadecimal values. Not supported
unless the entire node is allocated to the job.
mask_ldom:<list>
Bind by setting NUMA locality domain masks on tasks as specified
where <list> is <mask1>,<mask2>,...<maskN>. NUMA locality domain
masks are always interpreted as hexadecimal values but can be
preceded with an optional '0x'. Not supported unless the entire node
is allocated to the job.
sockets
Automatically generate masks binding tasks to sockets. Only the CPUs
on the socket which have been allocated to the job will be used. If
the number of tasks differs from the number of allocated sockets this
can result in sub-optimal binding.
cores Automatically generate masks binding tasks to cores. If the number
of tasks differs from the number of allocated cores this can result
in sub-optimal binding.
threads
Automatically generate masks binding tasks to threads. If the number
of tasks differs from the number of allocated threads this can result
in sub-optimal binding.
ldoms Automatically generate masks binding tasks to NUMA locality domains.
If the number of tasks differs from the number of allocated locality
domains this can result in sub-optimal binding.
help Show help message for cpu-bind
This option applies to job and step allocations.
--cpu-freq=<p1>[-p2[:p3]]
Request that the job step initiated by this srun command be run at some requested
frequency if possible, on the CPUs selected for the step on the compute node(s).
p1 can be [#### | low | medium | high | highm1] which will set the frequency
scaling_speed to the corresponding value, and set the frequency scaling_governor to
UserSpace. See below for definition of the values.
p1 can be [Conservative | OnDemand | Performance | PowerSave] which will set the
scaling_governor to the corresponding value. The governor has to be in the list set
by the slurm.conf option CpuFreqGovernors.
When p2 is present, p1 will be the minimum scaling frequency and p2 will be the
maximum scaling frequency.
p2 can be [#### | medium | high | highm1] p2 must be greater than p1.
p3 can be [Conservative | OnDemand | Performance | PowerSave | SchedUtil |
UserSpace] which will set the governor to the corresponding value.
If p3 is UserSpace, the frequency scaling_speed will be set by a power or energy
aware scheduling strategy to a value between p1 and p2 that lets the job run within
the site's power goal. The job may be delayed if p1 is higher than a frequency that
allows the job to run within the goal.
If the current frequency is < min, it will be set to min. Likewise, if the current
frequency is > max, it will be set to max.
Acceptable values at present include:
#### frequency in kilohertz
Low the lowest available frequency
High the highest available frequency
HighM1 (high minus one) will select the next highest available frequency
Medium attempts to set a frequency in the middle of the available range
Conservative attempts to use the Conservative CPU governor
OnDemand attempts to use the OnDemand CPU governor (the default value)
Performance attempts to use the Performance CPU governor
PowerSave attempts to use the PowerSave CPU governor
UserSpace attempts to use the UserSpace CPU governor
The following informational environment variable is set in the job
step when --cpu-freq option is requested.
SLURM_CPU_FREQ_REQ
This environment variable can also be used to supply the value for the CPU
frequency request if it is set when the 'srun' command is issued. The --cpu-freq
on the command line will override the environment variable value. The form on the
environment variable is the same as the command line. See the ENVIRONMENT
VARIABLES section for a description of the SLURM_CPU_FREQ_REQ variable.
NOTE: This parameter is treated as a request, not a requirement. If the job step's
node does not support setting the CPU frequency, or the requested value is outside
the bounds of the legal frequencies, an error is logged, but the job step is
allowed to continue.
NOTE: Setting the frequency for just the CPUs of the job step implies that the
tasks are confined to those CPUs. If task confinement (i.e.,
TaskPlugin=task/affinity or TaskPlugin=task/cgroup with the "ConstrainCores"
option) is not configured, this parameter is ignored.
NOTE: When the step completes, the frequency and governor of each selected CPU is
reset to the previous values.
NOTE: When submitting jobs with the --cpu-freq option with linuxproc as the
ProctrackType can cause jobs to run too quickly before Accounting is able to poll
for job information. As a result not all of accounting information will be present.
This option applies to job and step allocations.
--cpus-per-gpu=<ncpus>
Advise Slurm that ensuing job steps will require ncpus processors per allocated
GPU. Not compatible with the --cpus-per-task option.
-c, --cpus-per-task=<ncpus>
Request that ncpus be allocated per process. This may be useful if the job is
multithreaded and requires more than one CPU per task for optimal performance.
Explicitly requesting this option implies --exact. The default is one CPU per
process and does not imply --exact. If -c is specified without -n, as many tasks
will be allocated per node as possible while satisfying the -c restriction. For
instance on a cluster with 8 CPUs per node, a job request for 4 nodes and 3 CPUs
per task may be allocated 3 or 6 CPUs per node (1 or 2 tasks per node) depending
upon resource consumption by other jobs. Such a job may be unable to execute more
than a total of 4 tasks.
WARNING: There are configurations and options interpreted differently by job and
job step requests which can result in inconsistencies for this option. For example
srun -c2 --threads-per-core=1 prog may allocate two cores for the job, but if each
of those cores contains two threads, the job allocation will include four CPUs. The
job step allocation will then launch two threads per CPU for a total of two tasks.
WARNING: When srun is executed from within salloc or sbatch, there are
configurations and options which can result in inconsistent allocations when -c has
a value greater than -c on salloc or sbatch.
This option applies to job and step allocations.
--deadline=<OPT>
remove the job if no ending is possible before this deadline (start > (deadline -
time[-min])). Default is no deadline. Valid time formats are:
HH:MM[:SS] [AM|PM]
MMDD[YY] or MM/DD[/YY] or MM.DD[.YY]
MM/DD[/YY]-HH:MM[:SS]
YYYY-MM-DD[THH:MM[:SS]]]
now[+count[seconds(default)|minutes|hours|days|weeks]]
This option applies only to job allocations.
--delay-boot=<minutes>
Do not reboot nodes in order to satisfied this job's feature specification if the
job has been eligible to run for less than this time period. If the job has waited
for less than the specified period, it will use only nodes which already have the
specified features. The argument is in units of minutes. A default value may be
set by a system administrator using the delay_boot option of the
SchedulerParameters configuration parameter in the slurm.conf file, otherwise the
default value is zero (no delay).
This option applies only to job allocations.
-d, --dependency=<dependency_list>
Defer the start of this job until the specified dependencies have been satisfied
completed. This option does not apply to job steps (executions of srun within an
existing salloc or sbatch allocation) only to job allocations. <dependency_list>
is of the form <type:job_id[:job_id][,type:job_id[:job_id]]> or
<type:job_id[:job_id][?type:job_id[:job_id]]>. All dependencies must be satisfied
if the "," separator is used. Any dependency may be satisfied if the "?" separator
is used. Only one separator may be used. Many jobs can share the same dependency
and these jobs may even belong to different users. The value may be changed after
job submission using the scontrol command. Dependencies on remote jobs are allowed
in a federation. Once a job dependency fails due to the termination state of a
preceding job, the dependent job will never be run, even if the preceding job is
requeued and has a different termination state in a subsequent execution. This
option applies to job allocations.
after:job_id[[+time][:jobid[+time]...]]
After the specified jobs start or are cancelled and 'time' in minutes from
job start or cancellation happens, this job can begin execution. If no
'time' is given then there is no delay after start or cancellation.
afterany:job_id[:jobid...]
This job can begin execution after the specified jobs have terminated.
afterburstbuffer:job_id[:jobid...]
This job can begin execution after the specified jobs have terminated and
any associated burst buffer stage out operations have completed.
aftercorr:job_id[:jobid...]
A task of this job array can begin execution after the corresponding task ID
in the specified job has completed successfully (ran to completion with an
exit code of zero).
afternotok:job_id[:jobid...]
This job can begin execution after the specified jobs have terminated in
some failed state (non-zero exit code, node failure, timed out, etc).
afterok:job_id[:jobid...]
This job can begin execution after the specified jobs have successfully
executed (ran to completion with an exit code of zero).
singleton
This job can begin execution after any previously launched jobs sharing the
same job name and user have terminated. In other words, only one job by
that name and owned by that user can be running or suspended at any point in
time. In a federation, a singleton dependency must be fulfilled on all
clusters unless DependencyParameters=disable_remote_singleton is used in
slurm.conf.
-X, --disable-status
Disable the display of task status when srun receives a single SIGINT (Ctrl-C).
Instead immediately forward the SIGINT to the running job. Without this option a
second Ctrl-C in one second is required to forcibly terminate the job and srun will
immediately exit. May also be set via the environment variable
SLURM_DISABLE_STATUS. This option applies to job allocations.
-m,
--distribution={*|block|cyclic|arbitrary|plane=<size>}[:{*|block|cyclic|fcyclic}[:{*|block|cyclic|fcyclic}]][,{Pack|NoPack}]
Specify alternate distribution methods for remote processes. For job allocation,
this sets environment variables that will be used by subsequent srun requests and
also affects which cores will be selected for job allocation.
This option controls the distribution of tasks to the nodes on which resources have
been allocated, and the distribution of those resources to tasks for binding (task
affinity). The first distribution method (before the first ":") controls the
distribution of tasks to nodes. The second distribution method (after the first
":") controls the distribution of allocated CPUs across sockets for binding to
tasks. The third distribution method (after the second ":") controls the
distribution of allocated CPUs across cores for binding to tasks. The second and
third distributions apply only if task affinity is enabled. The third distribution
is supported only if the task/cgroup plugin is configured. The default value for
each distribution type is specified by *.
Note that with select/cons_res and select/cons_tres, the number of CPUs allocated
to each socket and node may be different. Refer to
https://slurm.schedmd.com/mc_support.html for more information on resource
allocation, distribution of tasks to nodes, and binding of tasks to CPUs.
First distribution method (distribution of tasks across nodes):
* Use the default method for distributing tasks to nodes (block).
block The block distribution method will distribute tasks to a node such that
consecutive tasks share a node. For example, consider an allocation of three
nodes each with two cpus. A four-task block distribution request will
distribute those tasks to the nodes with tasks one and two on the first
node, task three on the second node, and task four on the third node. Block
distribution is the default behavior if the number of tasks exceeds the
number of allocated nodes.
cyclic The cyclic distribution method will distribute tasks to a node such that
consecutive tasks are distributed over consecutive nodes (in a round-robin
fashion). For example, consider an allocation of three nodes each with two
cpus. A four-task cyclic distribution request will distribute those tasks to
the nodes with tasks one and four on the first node, task two on the second
node, and task three on the third node. Note that when SelectType is
select/cons_res, the same number of CPUs may not be allocated on each node.
Task distribution will be round-robin among all the nodes with CPUs yet to
be assigned to tasks. Cyclic distribution is the default behavior if the
number of tasks is no larger than the number of allocated nodes.
plane The tasks are distributed in blocks of size <size>. The size must be given
or SLURM_DIST_PLANESIZE must be set. The number of tasks distributed to each
node is the same as for cyclic distribution, but the taskids assigned to
each node depend on the plane size. Additional distribution specifications
cannot be combined with this option. For more details (including examples
and diagrams), please see https://slurm.schedmd.com/mc_support.html and
https://slurm.schedmd.com/dist_plane.html
arbitrary
The arbitrary method of distribution will allocate processes in-order as
listed in file designated by the environment variable SLURM_HOSTFILE. If
this variable is listed it will over ride any other method specified. If
not set the method will default to block. Inside the hostfile must contain
at minimum the number of hosts requested and be one per line or comma
separated. If specifying a task count (-n, --ntasks=<number>), your tasks
will be laid out on the nodes in the order of the file.
NOTE: The arbitrary distribution option on a job allocation only controls
the nodes to be allocated to the job and not the allocation of CPUs on those
nodes. This option is meant primarily to control a job step's task layout in
an existing job allocation for the srun command.
NOTE: If the number of tasks is given and a list of requested nodes is also
given, the number of nodes used from that list will be reduced to match that
of the number of tasks if the number of nodes in the list is greater than
the number of tasks.
Second distribution method (distribution of CPUs across sockets for binding):
* Use the default method for distributing CPUs across sockets (cyclic).
block The block distribution method will distribute allocated CPUs consecutively
from the same socket for binding to tasks, before using the next consecutive
socket.
cyclic The cyclic distribution method will distribute allocated CPUs for binding to
a given task consecutively from the same socket, and from the next
consecutive socket for the next task, in a round-robin fashion across
sockets. Tasks requiring more than one CPU will have all of those CPUs
allocated on a single socket if possible.
fcyclic
The fcyclic distribution method will distribute allocated CPUs for binding
to tasks from consecutive sockets in a round-robin fashion across the
sockets. Tasks requiring more than one CPU will have each CPUs allocated in
a cyclic fashion across sockets.
Third distribution method (distribution of CPUs across cores for binding):
* Use the default method for distributing CPUs across cores (inherited from
second distribution method).
block The block distribution method will distribute allocated CPUs consecutively
from the same core for binding to tasks, before using the next consecutive
core.
cyclic The cyclic distribution method will distribute allocated CPUs for binding to
a given task consecutively from the same core, and from the next consecutive
core for the next task, in a round-robin fashion across cores.
fcyclic
The fcyclic distribution method will distribute allocated CPUs for binding
to tasks from consecutive cores in a round-robin fashion across the cores.
Optional control for task distribution over nodes:
Pack Rather than evenly distributing a job step's tasks evenly across its
allocated nodes, pack them as tightly as possible on the nodes. This only
applies when the "block" task distribution method is used.
NoPack Rather than packing a job step's tasks as tightly as possible on the nodes,
distribute them evenly. This user option will supersede the
SelectTypeParameters CR_Pack_Nodes configuration parameter.
This option applies to job and step allocations.
--epilog={none|<executable>}
srun will run executable just after the job step completes. The command line
arguments for executable will be the command and arguments of the job step. If
none is specified, then no srun epilog will be run. This parameter overrides the
SrunEpilog parameter in slurm.conf. This parameter is completely independent from
the Epilog parameter in slurm.conf. This option applies to job allocations.
-e, --error=<filename_pattern>
Specify how stderr is to be redirected. By default in interactive mode, srun
redirects stderr to the same file as stdout, if one is specified. The --error
option is provided to allow stdout and stderr to be redirected to different
locations. See IO Redirection below for more options. If the specified file
already exists, it will be overwritten. This option applies to job and step
allocations.
--exact
Allow a step access to only the resources requested for the step. By default, all
non-GRES resources on each node in the step allocation will be used. This option
only applies to step allocations.
NOTE: Parallel steps will either be blocked or rejected until requested step
resources are available unless --overlap is specified. Job resources can be held
after the completion of an srun command while Slurm does job cleanup. Step epilogs
and/or SPANK plugins can further delay the release of step resources.
-x, --exclude={<host1[,<host2>...]|<filename>}
Request that a specific list of hosts not be included in the resources allocated to
this job. The host list will be assumed to be a filename if it contains a "/"
character. This option applies to job and step allocations.
--exclusive[={user|mcs}]
This option applies to job and job step allocations, and has two slightly different
meanings for each one. When used to initiate a job, the job allocation cannot
share nodes with other running jobs (or just other users with the "=user" option
or "=mcs" option). If user/mcs are not specified (i.e. the job allocation can not
share nodes with other running jobs), the job is allocated all CPUs and GRES on all
nodes in the allocation, but is only allocated as much memory as it requested. This
is by design to support gang scheduling, because suspended jobs still reside in
memory. To request all the memory on a node, use --mem=0. The default
shared/exclusive behavior depends on system configuration and the partition's
OverSubscribe option takes precedence over the job's option.
This option can also be used when initiating more than one job step within an
existing resource allocation (default), where you want separate processors to be
dedicated to each job step. If sufficient processors are not available to initiate
the job step, it will be deferred. This can be thought of as providing a mechanism
for resource management to the job within its allocation (--exact implied).
The exclusive allocation of CPUs applies to job steps by default, but --exact is
NOT the default. In other words, the default behavior is this: job steps will not
share CPUs, but job steps will be allocated all CPUs available to the job on all
nodes allocated to the steps.
In order to share the resources use the --overlap option.
See EXAMPLE below.
--export={[ALL,]<environment_variables>|ALL|NONE}
Identify which environment variables from the submission environment are propagated
to the launched application.
--export=ALL
Default mode if --export is not specified. All of the user's environment
will be loaded from the caller's environment.
--export=NONE
None of the user environment will be defined. User must use absolute path
to the binary to be executed that will define the environment. User can
not specify explicit environment variables with "NONE".
This option is particularly important for jobs that are submitted on one
cluster and execute on a different cluster (e.g. with different paths).
To avoid steps inheriting environment export settings (e.g. "NONE") from
sbatch command, either set --export=ALL or the environment variable
SLURM_EXPORT_ENV should be set to "ALL".
--export=[ALL,]<environment_variables>
Exports all SLURM* environment variables along with explicitly defined
variables. Multiple environment variable names should be comma separated.
Environment variable names may be specified to propagate the current
value (e.g. "--export=EDITOR") or specific values may be exported (e.g.
"--export=EDITOR=/bin/emacs"). If "ALL" is specified, then all user
environment variables will be loaded and will take precedence over any
explicitly given environment variables.
Example: --export=EDITOR,ARG1=test
In this example, the propagated environment will only contain the
variable EDITOR from the user's environment, SLURM_* environment
variables, and ARG1=test.
Example: --export=ALL,EDITOR=/bin/emacs
There are two possible outcomes for this example. If the caller has the
EDITOR environment variable defined, then the job's environment will
inherit the variable from the caller's environment. If the caller
doesn't have an environment variable defined for EDITOR, then the job's
environment will use the value given by --export.
-B, --extra-node-info=<sockets>[:cores[:threads]]
Restrict node selection to nodes with at least the specified number of sockets,
cores per socket and/or threads per core.
NOTE: These options do not specify the resource allocation size. Each value
specified is considered a minimum. An asterisk (*) can be used as a placeholder
indicating that all available resources of that type are to be utilized. Values can
also be specified as min-max. The individual levels can also be specified in
separate options if desired:
--sockets-per-node=<sockets>
--cores-per-socket=<cores>
--threads-per-core=<threads>
If task/affinity plugin is enabled, then specifying an allocation in this manner
also sets a default --cpu-bind option of threads if the -B option specifies a
thread count, otherwise an option of cores if a core count is specified, otherwise
an option of sockets. If SelectType is configured to select/cons_res, it must have
a parameter of CR_Core, CR_Core_Memory, CR_Socket, or CR_Socket_Memory for this
option to be honored. If not specified, the scontrol show job will display
'ReqS:C:T=*:*:*'. This option applies to job allocations.
NOTE: This option is mutually exclusive with --hint, --threads-per-core and
--ntasks-per-core.
NOTE: If the number of sockets, cores and threads were all specified, the number of
nodes was specified (as a fixed number, not a range) and the number of tasks was
NOT specified, srun will implicitly calculate the number of tasks as one task per
thread.
--gid=<group>
If srun is run as root, and the --gid option is used, submit the job with group's
group access permissions. group may be the group name or the numerical group ID.
This option applies to job allocations.
--gpu-bind=[verbose,]<type>
Bind tasks to specific GPUs. By default every spawned task can access every GPU
allocated to the step. If "verbose," is specified before <type>, then print out
GPU binding debug information to the stderr of the tasks. GPU binding is ignored if
there is only one task.
Supported type options:
closest Bind each task to the GPU(s) which are closest. In a NUMA environment,
each task may be bound to more than one GPU (i.e. all GPUs in that NUMA
environment).
map_gpu:<list>
Bind by setting GPU masks on tasks (or ranks) as specified where <list>
is <gpu_id_for_task_0>,<gpu_id_for_task_1>,... GPU IDs are interpreted as
decimal values unless they are preceded with '0x' in which case they
interpreted as hexadecimal values. If the number of tasks (or ranks)
exceeds the number of elements in this list, elements in the list will be
reused as needed starting from the beginning of the list. To simplify
support for large task counts, the lists may follow a map with an
asterisk and repetition count. For example "map_gpu:0*4,1*4". If the
task/cgroup plugin is used and ConstrainDevices is set in cgroup.conf,
then the GPU IDs are zero-based indexes relative to the GPUs allocated to
the job (e.g. the first GPU is 0, even if the global ID is 3). Otherwise,
the GPU IDs are global IDs, and all GPUs on each node in the job should
be allocated for predictable binding results.
mask_gpu:<list>
Bind by setting GPU masks on tasks (or ranks) as specified where <list>
is <gpu_mask_for_task_0>,<gpu_mask_for_task_1>,... The mapping is
specified for a node and identical mapping is applied to the tasks on
every node (i.e. the lowest task ID on each node is mapped to the first
mask specified in the list, etc.). GPU masks are always interpreted as
hexadecimal values but can be preceded with an optional '0x'. To simplify
support for large task counts, the lists may follow a map with an
asterisk and repetition count. For example "mask_gpu:0x0f*4,0xf0*4". If
the task/cgroup plugin is used and ConstrainDevices is set in
cgroup.conf, then the GPU IDs are zero-based indexes relative to the GPUs
allocated to the job (e.g. the first GPU is 0, even if the global ID is
3). Otherwise, the GPU IDs are global IDs, and all GPUs on each node in
the job should be allocated for predictable binding results.
none Do not bind tasks to GPUs (turns off binding if --gpus-per-task is
requested).
per_task:<gpus_per_task>
Each task will be bound to the number of gpus specified in
<gpus_per_task>. Gpus are assigned in order to tasks. The first task will
be assigned the first x number of gpus on the node etc.
single:<tasks_per_gpu>
Like --gpu-bind=closest, except that each task can only be bound to a
single GPU, even when it can be bound to multiple GPUs that are equally
close. The GPU to bind to is determined by <tasks_per_gpu>, where the
first <tasks_per_gpu> tasks are bound to the first GPU available, the
second <tasks_per_gpu> tasks are bound to the second GPU available, etc.
This is basically a block distribution of tasks onto available GPUs,
where the available GPUs are determined by the socket affinity of the
task and the socket affinity of the GPUs as specified in gres.conf's
Cores parameter.
--gpu-freq=[<type]=value>[,<type=value>][,verbose]
Request that GPUs allocated to the job are configured with specific frequency
values. This option can be used to independently configure the GPU and its memory
frequencies. After the job is completed, the frequencies of all affected GPUs will
be reset to the highest possible values. In some cases, system power caps may
override the requested values. The field type can be "memory". If type is not
specified, the GPU frequency is implied. The value field can either be "low",
"medium", "high", "highm1" or a numeric value in megahertz (MHz). If the specified
numeric value is not possible, a value as close as possible will be used. See below
for definition of the values. The verbose option causes current GPU frequency
information to be logged. Examples of use include "--gpu-freq=medium,memory=high"
and "--gpu-freq=450".
Supported value definitions:
low the lowest available frequency.
medium attempts to set a frequency in the middle of the available range.
high the highest available frequency.
highm1 (high minus one) will select the next highest available frequency.
-G, --gpus=[type:]<number>
Specify the total number of GPUs required for the job. An optional GPU type
specification can be supplied. For example "--gpus=volta:3". Multiple options can
be requested in a comma separated list, for example: "--gpus=volta:3,kepler:1".
See also the --gpus-per-node, --gpus-per-socket and --gpus-per-task options.
--gpus-per-node=[type:]<number>
Specify the number of GPUs required for the job on each node included in the job's
resource allocation. An optional GPU type specification can be supplied. For
example "--gpus-per-node=volta:3". Multiple options can be requested in a comma
separated list, for example: "--gpus-per-node=volta:3,kepler:1". See also the
--gpus, --gpus-per-socket and --gpus-per-task options.
--gpus-per-socket=[type:]<number>
Specify the number of GPUs required for the job on each socket included in the
job's resource allocation. An optional GPU type specification can be supplied.
For example "--gpus-per-socket=volta:3". Multiple options can be requested in a
comma separated list, for example: "--gpus-per-socket=volta:3,kepler:1". Requires
job to specify a sockets per node count ( --sockets-per-node). See also the
--gpus, --gpus-per-node and --gpus-per-task options. This option applies to job
allocations.
--gpus-per-task=[type:]<number>
Specify the number of GPUs required for the job on each task to be spawned in the
job's resource allocation. An optional GPU type specification can be supplied.
For example "--gpus-per-task=volta:1". Multiple options can be requested in a comma
separated list, for example: "--gpus-per-task=volta:3,kepler:1". See also the
--gpus, --gpus-per-socket and --gpus-per-node options. This option requires an
explicit task count, e.g. -n, --ntasks or "--gpus=X --gpus-per-task=Y" rather than
an ambiguous range of nodes with -N, --nodes. This option will implicitly set
--gpu-bind=per_task:<gpus_per_task>, but that can be overridden with an explicit
--gpu-bind specification.
--gres=<list>
Specifies a comma-delimited list of generic consumable resources. The format of
each entry on the list is "name[[:type]:count]". The name is that of the
consumable resource. The count is the number of those resources with a default
value of 1. The count can have a suffix of "k" or "K" (multiple of 1024), "m" or
"M" (multiple of 1024 x 1024), "g" or "G" (multiple of 1024 x 1024 x 1024), "t" or
"T" (multiple of 1024 x 1024 x 1024 x 1024), "p" or "P" (multiple of 1024 x 1024 x
1024 x 1024 x 1024). The specified resources will be allocated to the job on each
node. The available generic consumable resources is configurable by the system
administrator. A list of available generic consumable resources will be printed
and the command will exit if the option argument is "help". Examples of use
include "--gres=gpu:2", "--gres=gpu:kepler:2", and "--gres=help". NOTE: This
option applies to job and step allocations. By default, a job step is allocated all
of the generic resources that have been allocated to the job. To change the
behavior so that each job step is allocated no generic resources, explicitly set
the value of --gres to specify zero counts for each generic resource OR set
"--gres=none" OR set the SLURM_STEP_GRES environment variable to "none".
--gres-flags=<type>
Specify generic resource task binding options. This option applies to job
allocations.
disable-binding
Disable filtering of CPUs with respect to generic resource locality. This
option is currently required to use more CPUs than are bound to a GRES (i.e.
if a GPU is bound to the CPUs on one socket, but resources on more than one
socket are required to run the job). This option may permit a job to be
allocated resources sooner than otherwise possible, but may result in lower
job performance.
NOTE: This option is specific to SelectType=cons_res.
enforce-binding
The only CPUs available to the job will be those bound to the selected GRES
(i.e. the CPUs identified in the gres.conf file will be strictly enforced).
This option may result in delayed initiation of a job. For example a job
requiring two GPUs and one CPU will be delayed until both GPUs on a single
socket are available rather than using GPUs bound to separate sockets,
however, the application performance may be improved due to improved
communication speed. Requires the node to be configured with more than one
socket and resource filtering will be performed on a per-socket basis.
NOTE: This option is specific to SelectType=cons_tres.
-h, --help
Display help information and exit.
--het-group=<expr>
Identify each component in a heterogeneous job allocation for which a step is to be
created. Applies only to srun commands issued inside a salloc allocation or sbatch
script. <expr> is a set of integers corresponding to one or more options offsets
on the salloc or sbatch command line. Examples: "--het-group=2",
"--het-group=0,4", "--het-group=1,3-5". The default value is --het-group=0.
--hint=<type>
Bind tasks according to application hints.
NOTE: This option cannot be used in conjunction with any of --ntasks-per-core,
--threads-per-core, --cpu-bind (other than --cpu-bind=verbose) or -B. If --hint is
specified as a command line argument, it will take precedence over the environment.
compute_bound
Select settings for compute bound applications: use all cores in each
socket, one thread per core.
memory_bound
Select settings for memory bound applications: use only one core in each
socket, one thread per core.
[no]multithread
[don't] use extra threads with in-core multi-threading which can benefit
communication intensive applications. Only supported with the task/affinity
plugin.
help show this help message
This option applies to job allocations.
-H, --hold
Specify the job is to be submitted in a held state (priority of zero). A held job
can now be released using scontrol to reset its priority (e.g. "scontrol release
<job_id>"). This option applies to job allocations.
-I, --immediate[=<seconds>]
exit if resources are not available within the time period specified. If no
argument is given (seconds defaults to 1), resources must be available immediately
for the request to succeed. If defer is configured in SchedulerParameters and
seconds=1 the allocation request will fail immediately; defer conflicts and takes
precedence over this option. By default, --immediate is off, and the command will
block until resources become available. Since this option's argument is optional,
for proper parsing the single letter option must be followed immediately with the
value and not include a space between them. For example "-I60" and not "-I 60".
This option applies to job and step allocations.
-i, --input=<mode>
Specify how stdin is to redirected. By default, srun redirects stdin from the
terminal all tasks. See IO Redirection below for more options. For OS X, the
poll() function does not support stdin, so input from a terminal is not possible.
This option applies to job and step allocations.
-J, --job-name=<jobname>
Specify a name for the job. The specified name will appear along with the job id
number when querying running jobs on the system. The default is the supplied
executable program's name. NOTE: This information may be written to the
slurm_jobacct.log file. This file is space delimited so if a space is used in the
jobname name it will cause problems in properly displaying the contents of the
slurm_jobacct.log file when the sacct command is used. This option applies to job
and step allocations.
--jobid=<jobid>
Initiate a job step under an already allocated job with job id id. Using this
option will cause srun to behave exactly as if the SLURM_JOB_ID environment
variable was set. This option applies to step allocations.
-K, --kill-on-bad-exit[=0|1]
Controls whether or not to terminate a step if any task exits with a non-zero exit
code. If this option is not specified, the default action will be based upon the
Slurm configuration parameter of KillOnBadExit. If this option is specified, it
will take precedence over KillOnBadExit. An option argument of zero will not
terminate the job. A non-zero argument or no argument will terminate the job.
Note: This option takes precedence over the -W, --wait option to terminate the job
immediately if a task exits with a non-zero exit code. Since this option's
argument is optional, for proper parsing the single letter option must be followed
immediately with the value and not include a space between them. For example "-K1"
and not "-K 1".
-l, --label
Prepend task number to lines of stdout/err. The --label option will prepend lines
of output with the remote task id. This option applies to step allocations.
-L, --licenses=<license>[@db][:count][,license[@db][:count]...]
Specification of licenses (or other resources available on all nodes of the
cluster) which must be allocated to this job. License names can be followed by a
colon and count (the default count is one). Multiple license names should be comma
separated (e.g. "--licenses=foo:4,bar"). This option applies to job allocations.
--mail-type=<type>
Notify user by email when certain event types occur. Valid type values are NONE,
BEGIN, END, FAIL, REQUEUE, ALL (equivalent to BEGIN, END, FAIL, INVALID_DEPEND,
REQUEUE, and STAGE_OUT), INVALID_DEPEND (dependency never satisfied), STAGE_OUT
(burst buffer stage out and teardown completed), TIME_LIMIT, TIME_LIMIT_90 (reached
90 percent of time limit), TIME_LIMIT_80 (reached 80 percent of time limit), and
TIME_LIMIT_50 (reached 50 percent of time limit). Multiple type values may be
specified in a comma separated list. The user to be notified is indicated with
--mail-user. This option applies to job allocations.
--mail-user=<user>
User to receive email notification of state changes as defined by --mail-type. The
default value is the submitting user. This option applies to job allocations.
--mcs-label=<mcs>
Used only when the mcs/group plugin is enabled. This parameter is a group among
the groups of the user. Default value is calculated by the Plugin mcs if it's
enabled. This option applies to job allocations.
--mem=<size>[units]
Specify the real memory required per node. Default units are megabytes. Different
units can be specified using the suffix [K|M|G|T]. Default value is DefMemPerNode
and the maximum value is MaxMemPerNode. If configured, both of parameters can be
seen using the scontrol show config command. This parameter would generally be
used if whole nodes are allocated to jobs (SelectType=select/linear). Specifying a
memory limit of zero for a job step will restrict the job step to the amount of
memory allocated to the job, but not remove any of the job's memory allocation from
being available to other job steps. Also see --mem-per-cpu and --mem-per-gpu. The
--mem, --mem-per-cpu and --mem-per-gpu options are mutually exclusive. If --mem,
--mem-per-cpu or --mem-per-gpu are specified as command line arguments, then they
will take precedence over the environment (potentially inherited from salloc or
sbatch).
NOTE: A memory size specification of zero is treated as a special case and grants
the job access to all of the memory on each node for newly submitted jobs and all
available job memory to new job steps.
Specifying new memory limits for job steps are only advisory.
If the job is allocated multiple nodes in a heterogeneous cluster, the memory limit
on each node will be that of the node in the allocation with the smallest memory
size (same limit will apply to every node in the job's allocation).
NOTE: Enforcement of memory limits currently relies upon the task/cgroup plugin or
enabling of accounting, which samples memory use on a periodic basis (data need not
be stored, just collected). In both cases memory use is based upon the job's
Resident Set Size (RSS). A task may exceed the memory limit until the next periodic
accounting sample.
This option applies to job and step allocations.
--mem-bind=[{quiet|verbose},]<type>
Bind tasks to memory. Used only when the task/affinity plugin is enabled and the
NUMA memory functions are available. Note that the resolution of CPU and memory
binding may differ on some architectures. For example, CPU binding may be performed
at the level of the cores within a processor while memory binding will be performed
at the level of nodes, where the definition of "nodes" may differ from system to
system. By default no memory binding is performed; any task using any CPU can use
any memory. This option is typically used to ensure that each task is bound to the
memory closest to its assigned CPU. The use of any type other than "none" or
"local" is not recommended. If you want greater control, try running a simple test
code with the options "--cpu-bind=verbose,none --mem-bind=verbose,none" to
determine the specific configuration.
NOTE: To have Slurm always report on the selected memory binding for all commands
executed in a shell, you can enable verbose mode by setting the SLURM_MEM_BIND
environment variable value to "verbose".
The following informational environment variables are set when --mem-bind is in
use:
SLURM_MEM_BIND_LIST
SLURM_MEM_BIND_PREFER
SLURM_MEM_BIND_SORT
SLURM_MEM_BIND_TYPE
SLURM_MEM_BIND_VERBOSE
See the ENVIRONMENT VARIABLES section for a more detailed description of the
individual SLURM_MEM_BIND* variables.
Supported options include:
help show this help message
local Use memory local to the processor in use
map_mem:<list>
Bind by setting memory masks on tasks (or ranks) as specified where <list>
is <numa_id_for_task_0>,<numa_id_for_task_1>,... The mapping is specified
for a node and identical mapping is applied to the tasks on every node (i.e.
the lowest task ID on each node is mapped to the first ID specified in the
list, etc.). NUMA IDs are interpreted as decimal values unless they are
preceded with '0x' in which case they interpreted as hexadecimal values. If
the number of tasks (or ranks) exceeds the number of elements in this list,
elements in the list will be reused as needed starting from the beginning of
the list. To simplify support for large task counts, the lists may follow a
map with an asterisk and repetition count. For example
"map_mem:0x0f*4,0xf0*4". For predictable binding results, all CPUs for each
node in the job should be allocated to the job.
mask_mem:<list>
Bind by setting memory masks on tasks (or ranks) as specified where <list>
is <numa_mask_for_task_0>,<numa_mask_for_task_1>,... The mapping is
specified for a node and identical mapping is applied to the tasks on every
node (i.e. the lowest task ID on each node is mapped to the first mask
specified in the list, etc.). NUMA masks are always interpreted as
hexadecimal values. Note that masks must be preceded with a '0x' if they
don't begin with [0-9] so they are seen as numerical values. If the number
of tasks (or ranks) exceeds the number of elements in this list, elements in
the list will be reused as needed starting from the beginning of the list.
To simplify support for large task counts, the lists may follow a mask with
an asterisk and repetition count. For example "mask_mem:0*4,1*4". For
predictable binding results, all CPUs for each node in the job should be
allocated to the job.
no[ne] don't bind tasks to memory (default)
nosort avoid sorting free cache pages (default, LaunchParameters configuration
parameter can override this default)
p[refer]
Prefer use of first specified NUMA node, but permit
use of other available NUMA nodes.
q[uiet]
quietly bind before task runs (default)
rank bind by task rank (not recommended)
sort sort free cache pages (run zonesort on Intel KNL nodes)
v[erbose]
verbosely report binding before task runs
This option applies to job and step allocations.
--mem-per-cpu=<size>[units]
Minimum memory required per allocated CPU. Default units are megabytes. Different
units can be specified using the suffix [K|M|G|T]. The default value is
DefMemPerCPU and the maximum value is MaxMemPerCPU (see exception below). If
configured, both parameters can be seen using the scontrol show config command.
Note that if the job's --mem-per-cpu value exceeds the configured MaxMemPerCPU,
then the user's limit will be treated as a memory limit per task; --mem-per-cpu
will be reduced to a value no larger than MaxMemPerCPU; --cpus-per-task will be set
and the value of --cpus-per-task multiplied by the new --mem-per-cpu value will
equal the original --mem-per-cpu value specified by the user. This parameter would
generally be used if individual processors are allocated to jobs
(SelectType=select/cons_res). If resources are allocated by core, socket, or whole
nodes, then the number of CPUs allocated to a job may be higher than the task count
and the value of --mem-per-cpu should be adjusted accordingly. Specifying a memory
limit of zero for a job step will restrict the job step to the amount of memory
allocated to the job, but not remove any of the job's memory allocation from being
available to other job steps. Also see --mem and --mem-per-gpu. The --mem,
--mem-per-cpu and --mem-per-gpu options are mutually exclusive.
NOTE: If the final amount of memory requested by a job can't be satisfied by any of
the nodes configured in the partition, the job will be rejected. This could happen
if --mem-per-cpu is used with the --exclusive option for a job allocation and
--mem-per-cpu times the number of CPUs on a node is greater than the total memory
of that node.
--mem-per-gpu=<size>[units]
Minimum memory required per allocated GPU. Default units are megabytes. Different
units can be specified using the suffix [K|M|G|T]. Default value is DefMemPerGPU
and is available on both a global and per partition basis. If configured, the
parameters can be seen using the scontrol show config and scontrol show partition
commands. Also see --mem. The --mem, --mem-per-cpu and --mem-per-gpu options are
mutually exclusive.
--mincpus=<n>
Specify a minimum number of logical cpus/processors per node. This option applies
to job allocations.
--mpi=<mpi_type>
Identify the type of MPI to be used. May result in unique initiation procedures.
list Lists available mpi types to choose from.
pmi2 To enable PMI2 support. The PMI2 support in Slurm works only if the MPI
implementation supports it, in other words if the MPI has the PMI2 interface
implemented. The --mpi=pmi2 will load the library lib/slurm/mpi_pmi2.so
which provides the server side functionality but the client side must
implement PMI2_Init() and the other interface calls.
pmix To enable PMIx support (https://pmix.github.io). The PMIx support in Slurm
can be used to launch parallel applications (e.g. MPI) if it supports PMIx,
PMI2 or PMI1. Slurm must be configured with pmix support by passing
"--with-pmix=<PMIx installation path>" option to its "./configure" script.
At the time of writing PMIx is supported in Open MPI starting from version
2.0. PMIx also supports backward compatibility with PMI1 and PMI2 and can
be used if MPI was configured with PMI2/PMI1 support pointing to the PMIx
library ("libpmix"). If MPI supports PMI1/PMI2 but doesn't provide the way
to point to a specific implementation, a hack'ish solution leveraging
LD_PRELOAD can be used to force "libpmix" usage.
none No special MPI processing. This is the default and works with many other
versions of MPI.
This option applies to step allocations.
--msg-timeout=<seconds>
Modify the job launch message timeout. The default value is MessageTimeout in the
Slurm configuration file slurm.conf. Changes to this are typically not
recommended, but could be useful to diagnose problems. This option applies to job
allocations.
--multi-prog
Run a job with different programs and different arguments for each task. In this
case, the executable program specified is actually a configuration file specifying
the executable and arguments for each task. See MULTIPLE PROGRAM CONFIGURATION
below for details on the configuration file contents. This option applies to step
allocations.
--network=<type>
Specify information pertaining to the switch or network. The interpretation of
type is system dependent. This option is supported when running Slurm on a Cray
natively. It is used to request using Network Performance Counters. Only one
value per request is valid. All options are case in-sensitive. In this
configuration supported values include:
system
Use the system-wide network performance counters. Only nodes requested will
be marked in use for the job allocation. If the job does not fill up the
entire system the rest of the nodes are not able to be used by other jobs
using NPC, if idle their state will appear as PerfCnts. These nodes are
still available for other jobs not using NPC.
blade Use the blade network performance counters. Only nodes requested will be
marked in use for the job allocation. If the job does not fill up the entire
blade(s) allocated to the job those blade(s) are not able to be used by other
jobs using NPC, if idle their state will appear as PerfCnts. These nodes are
still available for other jobs not using NPC.
In all cases the job allocation request must specify the --exclusive option and the step
cannot specify the --overlap option. Otherwise the request will be denied.
Also with any of these options steps are not allowed to share blades, so resources would
remain idle inside an allocation if the step running on a blade does not take up all the
nodes on the blade.
The network option is also supported on systems with IBM's Parallel Environment (PE). See
IBM's LoadLeveler job command keyword documentation about the keyword "network" for more
information. Multiple values may be specified in a comma separated list. All options are
case in-sensitive. Supported values include:
BULK_XFER[=<resources>]
Enable bulk transfer of data using Remote Direct-Memory Access (RDMA).
The optional resources specification is a numeric value which can have
a suffix of "k", "K", "m", "M", "g" or "G" for kilobytes, megabytes or
gigabytes. NOTE: The resources specification is not supported by the
underlying IBM infrastructure as of Parallel Environment version 2.2
and no value should be specified at this time. The devices allocated
to a job must all be of the same type. The default value depends upon
depends upon what hardware is available and in order of preferences is
IPONLY (which is not considered in User Space mode), HFI, IB, HPCE, and
KMUX.
CAU=<count> Number of Collective Acceleration Units (CAU) required. Applies only
to IBM Power7-IH processors. Default value is zero. Independent CAU
will be allocated for each programming interface (MPI, LAPI, etc.)
DEVNAME=<name>
Specify the device name to use for communications (e.g. "eth0" or
"mlx4_0").
DEVTYPE=<type>
Specify the device type to use for communications. The supported
values of type are: "IB" (InfiniBand), "HFI" (P7 Host Fabric
Interface), "IPONLY" (IP-Only interfaces), "HPCE" (HPC Ethernet), and
"KMUX" (Kernel Emulation of HPCE). The devices allocated to a job must
all be of the same type. The default value depends upon depends upon
what hardware is available and in order of preferences is IPONLY (which
is not considered in User Space mode), HFI, IB, HPCE, and KMUX.
IMMED =<count>
Number of immediate send slots per window required. Applies only to
IBM Power7-IH processors. Default value is zero.
INSTANCES =<count>
Specify number of network connections for each task on each network
connection. The default instance count is 1.
IPV4 Use Internet Protocol (IP) version 4 communications (default).
IPV6 Use Internet Protocol (IP) version 6 communications.
LAPI Use the LAPI programming interface.
MPI Use the MPI programming interface. MPI is the default interface.
PAMI Use the PAMI programming interface.
SHMEM Use the OpenSHMEM programming interface.
SN_ALL Use all available switch networks (default).
SN_SINGLE Use one available switch network.
UPC Use the UPC programming interface.
US Use User Space communications.
Some examples of network specifications:
Instances=2,US,MPI,SN_ALL
Create two user space connections for MPI communications on every switch
network for each task.
US,MPI,Instances=3,Devtype=IB
Create three user space connections for MPI communications on every
InfiniBand network for each task.
IPV4,LAPI,SN_Single
Create a IP version 4 connection for LAPI communications on one switch
network for each task.
Instances=2,US,LAPI,MPI
Create two user space connections each for LAPI and MPI communications on
every switch network for each task. Note that SN_ALL is the default option
so every switch network is used. Also note that Instances=2 specifies that
two connections are established for each protocol (LAPI and MPI) and each
task. If there are two networks and four tasks on the node then a total of
32 connections are established (2 instances x 2 protocols x 2 networks x 4
tasks).
This option applies to job and step allocations.
--nice[=adjustment]
Run the job with an adjusted scheduling priority within Slurm. With no adjustment
value the scheduling priority is decreased by 100. A negative nice value increases
the priority, otherwise decreases it. The adjustment range is +/- 2147483645. Only
privileged users can specify a negative adjustment.
-Z, --no-allocate
Run the specified tasks on a set of nodes without creating a Slurm "job" in the
Slurm queue structure, bypassing the normal resource allocation step. The list of
nodes must be specified with the -w, --nodelist option. This is a privileged
option only available for the users "SlurmUser" and "root". This option applies to
job allocations.
-k, --no-kill[=off]
Do not automatically terminate a job if one of the nodes it has been allocated
fails. This option applies to job and step allocations. The job will assume all
responsibilities for fault-tolerance. Tasks launch using this option will not be
considered terminated (e.g. -K, --kill-on-bad-exit and -W, --wait options will have
no effect upon the job step). The active job step (MPI job) will likely suffer a
fatal error, but subsequent job steps may be run if this option is specified.
Specify an optional argument of "off" disable the effect of the SLURM_NO_KILL
environment variable.
The default action is to terminate the job upon node failure.
-F, --nodefile=<node_file>
Much like --nodelist, but the list is contained in a file of name node file. The
node names of the list may also span multiple lines in the file. Duplicate node
names in the file will be ignored. The order of the node names in the list is not
important; the node names will be sorted by Slurm.
-w, --nodelist={<node_name_list>|<filename>}
Request a specific list of hosts. The job will contain all of these hosts and
possibly additional hosts as needed to satisfy resource requirements. The list may
be specified as a comma-separated list of hosts, a range of hosts (host[1-5,7,...]
for example), or a filename. The host list will be assumed to be a filename if it
contains a "/" character. If you specify a minimum node or processor count larger
than can be satisfied by the supplied host list, additional resources will be
allocated on other nodes as needed. Rather than repeating a host name multiple
times, an asterisk and a repetition count may be appended to a host name. For
example "host1,host1" and "host1*2" are equivalent. If the number of tasks is given
and a list of requested nodes is also given, the number of nodes used from that
list will be reduced to match that of the number of tasks if the number of nodes in
the list is greater than the number of tasks. This option applies to job and step
allocations.
-N, --nodes=<minnodes>[-maxnodes]
Request that a minimum of minnodes nodes be allocated to this job. A maximum node
count may also be specified with maxnodes. If only one number is specified, this
is used as both the minimum and maximum node count. The partition's node limits
supersede those of the job. If a job's node limits are outside of the range
permitted for its associated partition, the job will be left in a PENDING state.
This permits possible execution at a later time, when the partition limit is
changed. If a job node limit exceeds the number of nodes configured in the
partition, the job will be rejected. Note that the environment variable
SLURM_JOB_NUM_NODES (and SLURM_NNODES for backwards compatibility) will be set to
the count of nodes actually allocated to the job. See the ENVIRONMENT VARIABLES
section for more information. If -N is not specified, the default behavior is to
allocate enough nodes to satisfy the requirements of the -n and -c options. The
job will be allocated as many nodes as possible within the range specified and
without delaying the initiation of the job. If the number of tasks is given and a
number of requested nodes is also given, the number of nodes used from that request
will be reduced to match that of the number of tasks if the number of nodes in the
request is greater than the number of tasks. The node count specification may
include a numeric value followed by a suffix of "k" (multiplies numeric value by
1,024) or "m" (multiplies numeric value by 1,048,576). This option applies to job
and step allocations.
-n, --ntasks=<number>
Specify the number of tasks to run. Request that srun allocate resources for ntasks
tasks. The default is one task per node, but note that the --cpus-per-task option
will change this default. This option applies to job and step allocations.
--ntasks-per-core=<ntasks>
Request the maximum ntasks be invoked on each core. This option applies to the job
allocation, but not to step allocations. Meant to be used with the --ntasks
option. Related to --ntasks-per-node except at the core level instead of the node
level. Masks will automatically be generated to bind the tasks to specific cores
unless --cpu-bind=none is specified. NOTE: This option is not supported when using
SelectType=select/linear.
--ntasks-per-gpu=<ntasks>
Request that there are ntasks tasks invoked for every GPU. This option can work in
two ways: 1) either specify --ntasks in addition, in which case a type-less GPU
specification will be automatically determined to satisfy --ntasks-per-gpu, or 2)
specify the GPUs wanted (e.g. via --gpus or --gres) without specifying --ntasks,
and the total task count will be automatically determined. The number of CPUs
needed will be automatically increased if necessary to allow for any calculated
task count. This option will implicitly set --gpu-bind=single:<ntasks>, but that
can be overridden with an explicit --gpu-bind specification. This option is not
compatible with a node range (i.e. -N<minnodes-maxnodes>). This option is not
compatible with --gpus-per-task, --gpus-per-socket, or --ntasks-per-node. This
option is not supported unless SelectType=cons_tres is configured (either directly
or indirectly on Cray systems).
--ntasks-per-node=<ntasks>
Request that ntasks be invoked on each node. If used with the --ntasks option, the
--ntasks option will take precedence and the --ntasks-per-node will be treated as a
maximum count of tasks per node. Meant to be used with the --nodes option. This
is related to --cpus-per-task=ncpus, but does not require knowledge of the actual
number of cpus on each node. In some cases, it is more convenient to be able to
request that no more than a specific number of tasks be invoked on each node.
Examples of this include submitting a hybrid MPI/OpenMP app where only one MPI
"task/rank" should be assigned to each node while allowing the OpenMP portion to
utilize all of the parallelism present in the node, or submitting a single
setup/cleanup/monitoring job to each node of a pre-existing allocation as one step
in a larger job script. This option applies to job allocations.
--ntasks-per-socket=<ntasks>
Request the maximum ntasks be invoked on each socket. This option applies to the
job allocation, but not to step allocations. Meant to be used with the --ntasks
option. Related to --ntasks-per-node except at the socket level instead of the
node level. Masks will automatically be generated to bind the tasks to specific
sockets unless --cpu-bind=none is specified. NOTE: This option is not supported
when using SelectType=select/linear.
--open-mode={append|truncate}
Open the output and error files using append or truncate mode as specified. For
heterogeneous job steps the default value is "append". Otherwise the default value
is specified by the system configuration parameter JobFileAppend. This option
applies to job and step allocations.
-o, --output=<filename_pattern>
Specify the "filename pattern" for stdout redirection. By default in interactive
mode, srun collects stdout from all tasks and sends this output via TCP/IP to the
attached terminal. With --output stdout may be redirected to a file, to one file
per task, or to /dev/null. See section IO Redirection below for the various forms
of filename pattern. If the specified file already exists, it will be overwritten.
If --error is not also specified on the command line, both stdout and stderr will
directed to the file specified by --output. This option applies to job and step
allocations.
-O, --overcommit
Overcommit resources. This option applies to job and step allocations.
When applied to a job allocation (not including jobs requesting exclusive access to
the nodes) the resources are allocated as if only one task per node is requested.
This means that the requested number of cpus per task (-c, --cpus-per-task) are
allocated per node rather than being multiplied by the number of tasks. Options
used to specify the number of tasks per node, socket, core, etc. are ignored.
When applied to job step allocations (the srun command when executed within an
existing job allocation), this option can be used to launch more than one task per
CPU. Normally, srun will not allocate more than one process per CPU. By
specifying --overcommit you are explicitly allowing more than one process per CPU.
However no more than MAX_TASKS_PER_NODE tasks are permitted to execute per node.
NOTE: MAX_TASKS_PER_NODE is defined in the file slurm.h and is not a variable, it
is set at Slurm build time.
--overlap
Allow steps to overlap each other on the CPUs. By default steps do not share CPUs
with other parallel steps.
-s, --oversubscribe
The job allocation can over-subscribe resources with other running jobs. The
resources to be over-subscribed can be nodes, sockets, cores, and/or hyperthreads
depending upon configuration. The default over-subscribe behavior depends on
system configuration and the partition's OverSubscribe option takes precedence over
the job's option. This option may result in the allocation being granted sooner
than if the --oversubscribe option was not set and allow higher system utilization,
but application performance will likely suffer due to competition for resources.
This option applies to step allocations.
-p, --partition=<partition_names>
Request a specific partition for the resource allocation. If not specified, the
default behavior is to allow the slurm controller to select the default partition
as designated by the system administrator. If the job can use more than one
partition, specify their names in a comma separate list and the one offering
earliest initiation will be used with no regard given to the partition name
ordering (although higher priority partitions will be considered first). When the
job is initiated, the name of the partition used will be placed first in the job
record partition string. This option applies to job allocations.
--power=<flags>
Comma separated list of power management plugin options. Currently available flags
include: level (all nodes allocated to the job should have identical power caps,
may be disabled by the Slurm configuration option PowerParameters=job_no_level).
This option applies to job allocations.
-E, --preserve-env
Pass the current values of environment variables SLURM_JOB_NUM_NODES and
SLURM_NTASKS through to the executable, rather than computing them from command
line parameters. This option applies to job allocations.
--priority=<value>
Request a specific job priority. May be subject to configuration specific
constraints. value should either be a numeric value or "TOP" (for highest possible
value). Only Slurm operators and administrators can set the priority of a job.
This option applies to job allocations only.
--profile={all|none|<type>[,<type>...]}
Enables detailed data collection by the acct_gather_profile plugin. Detailed data
are typically time-series that are stored in an HDF5 file for the job or an
InfluxDB database depending on the configured plugin. This option applies to job
and step allocations.
All All data types are collected. (Cannot be combined with other values.)
None No data types are collected. This is the default.
(Cannot be combined with other values.)
Valid type values are:
Energy Energy data is collected.
Task Task (I/O, Memory, ...) data is collected.
Filesystem
Filesystem data is collected.
Network
Network (InfiniBand) data is collected.
--prolog=<executable>
srun will run executable just before launching the job step. The command line
arguments for executable will be the command and arguments of the job step. If
executable is "none", then no srun prolog will be run. This parameter overrides the
SrunProlog parameter in slurm.conf. This parameter is completely independent from
the Prolog parameter in slurm.conf. This option applies to job allocations.
--propagate[=rlimit[,rlimit...]]
Allows users to specify which of the modifiable (soft) resource limits to propagate
to the compute nodes and apply to their jobs. If no rlimit is specified, then all
resource limits will be propagated. The following rlimit names are supported by
Slurm (although some options may not be supported on some systems):
ALL All limits listed below (default)
NONE No limits listed below
AS The maximum address space (virtual memory) for a process.
CORE The maximum size of core file
CPU The maximum amount of CPU time
DATA The maximum size of a process's data segment
FSIZE The maximum size of files created. Note that if the user sets FSIZE to
less than the current size of the slurmd.log, job launches will fail with
a 'File size limit exceeded' error.
MEMLOCK The maximum size that may be locked into memory
NOFILE The maximum number of open files
NPROC The maximum number of processes available
RSS The maximum resident set size. Note that this only has effect with Linux
kernels 2.4.30 or older or BSD.
STACK The maximum stack size
This option applies to job allocations.
--pty Execute task zero in pseudo terminal mode. Implicitly sets --unbuffered.
Implicitly sets --error and --output to /dev/null for all tasks except task zero,
which may cause those tasks to exit immediately (e.g. shells will typically exit
immediately in that situation). This option applies to step allocations.
-q, --qos=<qos>
Request a quality of service for the job. QOS values can be defined for each
user/cluster/account association in the Slurm database. Users will be limited to
their association's defined set of qos's when the Slurm configuration parameter,
AccountingStorageEnforce, includes "qos" in its definition. This option applies to
job allocations.
-Q, --quiet
Suppress informational messages from srun. Errors will still be displayed. This
option applies to job and step allocations.
--quit-on-interrupt
Quit immediately on single SIGINT (Ctrl-C). Use of this option disables the status
feature normally available when srun receives a single Ctrl-C and causes srun to
instead immediately terminate the running job. This option applies to step
allocations.
--reboot
Force the allocated nodes to reboot before starting the job. This is only
supported with some system configurations and will otherwise be silently ignored.
Only root, SlurmUser or admins can reboot nodes. This option applies to job
allocations.
-r, --relative=<n>
Run a job step relative to node n of the current allocation. This option may be
used to spread several job steps out among the nodes of the current job. If -r is
used, the current job step will begin at node n of the allocated nodelist, where
the first node is considered node 0. The -r option is not permitted with -w or -x
option and will result in a fatal error when not running within a prior allocation
(i.e. when SLURM_JOB_ID is not set). The default for n is 0. If the value of
--nodes exceeds the number of nodes identified with the --relative option, a
warning message will be printed and the --relative option will take precedence.
This option applies to step allocations.
--reservation=<reservation_names>
Allocate resources for the job from the named reservation. If the job can use more
than one reservation, specify their names in a comma separate list and the one
offering earliest initiation. Each reservation will be considered in the order it
was requested. All reservations will be listed in scontrol/squeue through the life
of the job. In accounting the first reservation will be seen and after the job
starts the reservation used will replace it.
--resv-ports[=count]
Reserve communication ports for this job. Users can specify the number of port they
want to reserve. The parameter MpiParams=ports=12000-12999 must be specified in
slurm.conf. If not specified and Slurm's OpenMPI plugin is used, then by default
the number of reserved equal to the highest number of tasks on any node in the job
step allocation. If the number of reserved ports is zero then no ports is
reserved. Used for OpenMPI. This option applies to job and step allocations.
--send-libs[=yes|no]
If set to yes (or no argument), autodetect and broadcast the executable's shared
object dependencies to allocated compute nodes. The files are placed in a directory
alongside the executable. The LD_LIBRARY_PATH is automatically updated to include
this cache directory as well. This overrides the default behavior configured in
slurm.conf SbcastParameters send_libs. This option only works in conjunction with
--bcast. See also --bcast-exclude.
--signal=[R:]<sig_num>[@sig_time]
When a job is within sig_time seconds of its end time, send it the signal sig_num.
Due to the resolution of event handling by Slurm, the signal may be sent up to 60
seconds earlier than specified. sig_num may either be a signal number or name
(e.g. "10" or "USR1"). sig_time must have an integer value between 0 and 65535.
By default, no signal is sent before the job's end time. If a sig_num is specified
without any sig_time, the default time will be 60 seconds. This option applies to
job allocations. Use the "R:" option to allow this job to overlap with a
reservation with MaxStartDelay set. To have the signal sent at preemption time see
the preempt_send_user_signal SlurmctldParameter.
--slurmd-debug=<level>
Specify a debug level for slurmd(8). The level may be specified either an integer
value between 0 [quiet, only errors are displayed] and 4 [verbose operation] or the
SlurmdDebug tags.
quiet Log nothing
fatal Log only fatal errors
error Log only errors
info Log errors and general informational messages
verbose Log errors and verbose informational messages
The slurmd debug information is copied onto the stderr of the job. By default only
errors are displayed. This option applies to job and step allocations.
--sockets-per-node=<sockets>
Restrict node selection to nodes with at least the specified number of sockets.
See additional information under -B option above when task/affinity plugin is
enabled. This option applies to job allocations.
NOTE: This option may implicitly impact the number of tasks if -n was not
specified.
--spread-job
Spread the job allocation over as many nodes as possible and attempt to evenly
distribute tasks across the allocated nodes. This option disables the
topology/tree plugin. This option applies to job allocations.
--switches=<count>[@max-time]
When a tree topology is used, this defines the maximum count of leaf switches
desired for the job allocation and optionally the maximum time to wait for that
number of switches. If Slurm finds an allocation containing more switches than the
count specified, the job remains pending until it either finds an allocation with
desired switch count or the time limit expires. It there is no switch count limit,
there is no delay in starting the job. Acceptable time formats include "minutes",
"minutes:seconds", "hours:minutes:seconds", "days-hours", "days-hours:minutes" and
"days-hours:minutes:seconds". The job's maximum time delay may be limited by the
system administrator using the SchedulerParameters configuration parameter with the
max_switch_wait parameter option. On a dragonfly network the only switch count
supported is 1 since communication performance will be highest when a job is
allocate resources on one leaf switch or more than 2 leaf switches. The default
max-time is the max_switch_wait SchedulerParameters. This option applies to job
allocations.
--task-epilog=<executable>
The slurmstepd daemon will run executable just after each task terminates. This
will be executed before any TaskEpilog parameter in slurm.conf is executed. This is
meant to be a very short-lived program. If it fails to terminate within a few
seconds, it will be killed along with any descendant processes. This option applies
to step allocations.
--task-prolog=<executable>
The slurmstepd daemon will run executable just before launching each task. This
will be executed after any TaskProlog parameter in slurm.conf is executed. Besides
the normal environment variables, this has SLURM_TASK_PID available to identify the
process ID of the task being started. Standard output from this program of the
form "export NAME=value" will be used to set environment variables for the task
being spawned. This option applies to step allocations.
--test-only
Returns an estimate of when a job would be scheduled to run given the current job
queue and all the other srun arguments specifying the job. This limits srun's
behavior to just return information; no job is actually submitted. The program
will be executed directly by the slurmd daemon. This option applies to job
allocations.
--thread-spec=<num>
Count of specialized threads per node reserved by the job for system operations and
not used by the application. The application will not use these threads, but will
be charged for their allocation. This option can not be used with the --core-spec
option. This option applies to job allocations.
-T, --threads=<nthreads>
Allows limiting the number of concurrent threads used to send the job request from
the srun process to the slurmd processes on the allocated nodes. Default is to use
one thread per allocated node up to a maximum of 60 concurrent threads. Specifying
this option limits the number of concurrent threads to nthreads (less than or equal
to 60). This should only be used to set a low thread count for testing on very
small memory computers. This option applies to job allocations.
--threads-per-core=<threads>
Restrict node selection to nodes with at least the specified number of threads per
core. In task layout, use the specified maximum number of threads per core. Implies
--exact and --cpu-bind=threads unless overridden by command line or environment
options. NOTE: "Threads" refers to the number of processing units on each core
rather than the number of application tasks to be launched per core. See additional
information under -B option above when task/affinity plugin is enabled. This option
applies to job and step allocations.
NOTE: This option may implicitly impact the number of tasks if -n was not
specified.
-t, --time=<time>
Set a limit on the total run time of the job allocation. If the requested time
limit exceeds the partition's time limit, the job will be left in a PENDING state
(possibly indefinitely). The default time limit is the partition's default time
limit. When the time limit is reached, each task in each job step is sent SIGTERM
followed by SIGKILL. The interval between signals is specified by the Slurm
configuration parameter KillWait. The OverTimeLimit configuration parameter may
permit the job to run longer than scheduled. Time resolution is one minute and
second values are rounded up to the next minute.
A time limit of zero requests that no time limit be imposed. Acceptable time
formats include "minutes", "minutes:seconds", "hours:minutes:seconds",
"days-hours", "days-hours:minutes" and "days-hours:minutes:seconds". This option
applies to job and step allocations.
--time-min=<time>
Set a minimum time limit on the job allocation. If specified, the job may have its
--time limit lowered to a value no lower than --time-min if doing so permits the
job to begin execution earlier than otherwise possible. The job's time limit will
not be changed after the job is allocated resources. This is performed by a
backfill scheduling algorithm to allocate resources otherwise reserved for higher
priority jobs. Acceptable time formats include "minutes", "minutes:seconds",
"hours:minutes:seconds", "days-hours", "days-hours:minutes" and
"days-hours:minutes:seconds". This option applies to job allocations.
--tmp=<size>[units]
Specify a minimum amount of temporary disk space per node. Default units are
megabytes. Different units can be specified using the suffix [K|M|G|T]. This
option applies to job allocations.
--uid=<user>
Attempt to submit and/or run a job as user instead of the invoking user id. The
invoking user's credentials will be used to check access permissions for the target
partition. User root may use this option to run jobs as a normal user in a RootOnly
partition for example. If run as root, srun will drop its permissions to the uid
specified after node allocation is successful. user may be the user name or
numerical user ID. This option applies to job and step allocations.
-u, --unbuffered
By default, the connection between slurmstepd and the user-launched application is
over a pipe. The stdio output written by the application is buffered by the glibc
until it is flushed or the output is set as unbuffered. See setbuf(3). If this
option is specified the tasks are executed with a pseudo terminal so that the
application output is unbuffered. This option applies to step allocations.
--usage
Display brief help message and exit.
--use-min-nodes
If a range of node counts is given, prefer the smaller count.
-v, --verbose
Increase the verbosity of srun's informational messages. Multiple -v's will
further increase srun's verbosity. By default only errors will be displayed. This
option applies to job and step allocations.
-V, --version
Display version information and exit.
-W, --wait=<seconds>
Specify how long to wait after the first task terminates before terminating all
remaining tasks. A value of 0 indicates an unlimited wait (a warning will be issued
after 60 seconds). The default value is set by the WaitTime parameter in the slurm
configuration file (see slurm.conf(5)). This option can be useful to ensure that a
job is terminated in a timely fashion in the event that one or more tasks terminate
prematurely. Note: The -K, --kill-on-bad-exit option takes precedence over -W,
--wait to terminate the job immediately if a task exits with a non-zero exit code.
This option applies to job allocations.
--wckey=<wckey>
Specify wckey to be used with job. If TrackWCKey=no (default) in the slurm.conf
this value is ignored. This option applies to job allocations.
--x11[={all|first|last}]
Sets up X11 forwarding on "all", "first" or "last" node(s) of the allocation. This
option is only enabled if Slurm was compiled with X11 support and PrologFlags=x11
is defined in the slurm.conf. Default is "all".
srun will submit the job request to the slurm job controller, then initiate all processes
on the remote nodes. If the request cannot be met immediately, srun will block until the
resources are free to run the job. If the -I (--immediate) option is specified srun will
terminate if resources are not immediately available.
When initiating remote processes srun will propagate the current working directory, unless
--chdir=<path> is specified, in which case path will become the working directory for the
remote processes.
The -n, -c, and -N options control how CPUs and nodes will be allocated to the job. When
specifying only the number of processes to run with -n, a default of one CPU per process
is allocated. By specifying the number of CPUs required per task (-c), more than one CPU
may be allocated per process. If the number of nodes is specified with -N, srun will
attempt to allocate at least the number of nodes specified.
Combinations of the above three options may be used to change how processes are
distributed across nodes and cpus. For instance, by specifying both the number of
processes and number of nodes on which to run, the number of processes per node is
implied. However, if the number of CPUs per process is more important then number of
processes (-n) and the number of CPUs per process (-c) should be specified.
srun will refuse to allocate more than one process per CPU unless --overcommit (-O) is
also specified.
srun will attempt to meet the above specifications "at a minimum." That is, if 16 nodes
are requested for 32 processes, and some nodes do not have 2 CPUs, the allocation of nodes
will be increased in order to meet the demand for CPUs. In other words, a minimum of 16
nodes are being requested. However, if 16 nodes are requested for 15 processes, srun will
consider this an error, as 15 processes cannot run across 16 nodes.
IO Redirection
By default, stdout and stderr will be redirected from all tasks to the stdout and stderr
of srun, and stdin will be redirected from the standard input of srun to all remote tasks.
If stdin is only to be read by a subset of the spawned tasks, specifying a file to read
from rather than forwarding stdin from the srun command may be preferable as it avoids
moving and storing data that will never be read.
For OS X, the poll() function does not support stdin, so input from a terminal is not
possible.
This behavior may be changed with the --output, --error, and --input (-o, -e, -i) options.
Valid format specifications for these options are
all stdout stderr is redirected from all tasks to srun. stdin is broadcast to all
remote tasks. (This is the default behavior)
none stdout and stderr is not received from any task. stdin is not sent to any task
(stdin is closed).
taskid stdout and/or stderr are redirected from only the task with relative id equal to
taskid, where 0 <= taskid <= ntasks, where ntasks is the total number of tasks
in the current job step. stdin is redirected from the stdin of srun to this
same task. This file will be written on the node executing the task.
filename srun will redirect stdout and/or stderr to the named file from all tasks. stdin
will be redirected from the named file and broadcast to all tasks in the job.
filename refers to a path on the host that runs srun. Depending on the
cluster's file system layout, this may result in the output appearing in
different places depending on whether the job is run in batch mode.
filename pattern
srun allows for a filename pattern to be used to generate the named IO file
described above. The following list of format specifiers may be used in the
format string to generate a filename that will be unique to a given jobid,
stepid, node, or task. In each case, the appropriate number of files are opened
and associated with the corresponding tasks. Note that any format string
containing %t, %n, and/or %N will be written on the node executing the task
rather than the node where srun executes, these format specifiers are not
supported on a BGQ system.
\\ Do not process any of the replacement symbols.
%% The character "%".
%A Job array's master job allocation number.
%a Job array ID (index) number.
%J jobid.stepid of the running job. (e.g. "128.0")
%j jobid of the running job.
%s stepid of the running job.
%N short hostname. This will create a separate IO file per node.
%n Node identifier relative to current job (e.g. "0" is the first node of
the running job) This will create a separate IO file per node.
%t task identifier (rank) relative to current job. This will create a
separate IO file per task.
%u User name.
%x Job name.
A number placed between the percent character and format specifier may be used
to zero-pad the result in the IO filename. This number is ignored if the format
specifier corresponds to non-numeric data (%N for example).
Some examples of how the format string may be used for a 4 task job step with a
Job ID of 128 and step id of 0 are included below:
job%J.out job128.0.out
job%4j.out job0128.out
job%j-%2t.out job128-00.out, job128-01.out, ...
PERFORMANCE
Executing srun sends a remote procedure call to slurmctld. If enough calls from srun or
other Slurm client commands that send remote procedure calls to the slurmctld daemon come
in at once, it can result in a degradation of performance of the slurmctld daemon,
possibly resulting in a denial of service.
Do not run srun or other Slurm client commands that send remote procedure calls to
slurmctld from loops in shell scripts or other programs. Ensure that programs limit calls
to srun to the minimum necessary for the information you are trying to gather.
INPUT ENVIRONMENT VARIABLES
Upon startup, srun will read and handle the options set in the following environment
variables. The majority of these variables are set the same way the options are set, as
defined above. For flag options that are defined to expect no argument, the option can be
enabled by setting the environment variable without a value (empty or NULL string), the
string 'yes', or a non-zero number. Any other value for the environment variable will
result in the option not being set. There are a couple exceptions to these rules that are
noted below.
NOTE: Command line options always override environment variable settings.
PMI_FANOUT This is used exclusively with PMI (MPICH2 and MVAPICH2) and controls
the fanout of data communications. The srun command sends messages
to application programs (via the PMI library) and those applications
may be called upon to forward that data to up to this number of
additional tasks. Higher values offload work from the srun command
to the applications and likely increase the vulnerability to
failures. The default value is 32.
PMI_FANOUT_OFF_HOST This is used exclusively with PMI (MPICH2 and MVAPICH2) and controls
the fanout of data communications. The srun command sends messages
to application programs (via the PMI library) and those applications
may be called upon to forward that data to additional tasks. By
default, srun sends one message per host and one task on that host
forwards the data to other tasks on that host up to PMI_FANOUT. If
PMI_FANOUT_OFF_HOST is defined, the user task may be required to
forward the data to tasks on other hosts. Setting
PMI_FANOUT_OFF_HOST may increase performance. Since more work is
performed by the PMI library loaded by the user application,
failures also can be more common and more difficult to diagnose.
Should be disabled/enabled by setting to 0 or 1.
PMI_TIME This is used exclusively with PMI (MPICH2 and MVAPICH2) and controls
how much the communications from the tasks to the srun are spread
out in time in order to avoid overwhelming the srun command with
work. The default value is 500 (microseconds) per task. On
relatively slow processors or systems with very large processor
counts (and large PMI data sets), higher values may be required.
SLURM_ACCOUNT Same as -A, --account
SLURM_ACCTG_FREQ Same as --acctg-freq
SLURM_BCAST Same as --bcast
SLURM_BCAST_EXCLUDE Same as --bcast-exclude
SLURM_BURST_BUFFER Same as --bb
SLURM_CLUSTERS Same as -M, --clusters
SLURM_COMPRESS Same as --compress
SLURM_CONF The location of the Slurm configuration file.
SLURM_CONSTRAINT Same as -C, --constraint
SLURM_CORE_SPEC Same as --core-spec
SLURM_CPU_BIND Same as --cpu-bind
SLURM_CPU_FREQ_REQ Same as --cpu-freq.
SLURM_CPUS_PER_GPU Same as --cpus-per-gpu
SLURM_CPUS_PER_TASK Same as -c, --cpus-per-task
SLURM_DEBUG Same as -v, --verbose. Must be set to 0 or 1 to disable or enable
the option.
SLURM_DELAY_BOOT Same as --delay-boot
SLURM_DEPENDENCY Same as -d, --dependency=<jobid>
SLURM_DISABLE_STATUS Same as -X, --disable-status
SLURM_DIST_PLANESIZE Plane distribution size. Only used if --distribution=plane, without
=<size>, is set.
SLURM_DISTRIBUTION Same as -m, --distribution
SLURM_EPILOG Same as --epilog
SLURM_EXACT Same as --exact
SLURM_EXCLUSIVE Same as --exclusive
SLURM_EXIT_ERROR Specifies the exit code generated when a Slurm error occurs (e.g.
invalid options). This can be used by a script to distinguish
application exit codes from various Slurm error conditions. Also
see SLURM_EXIT_IMMEDIATE.
SLURM_EXIT_IMMEDIATE Specifies the exit code generated when the --immediate option is
used and resources are not currently available. This can be used by
a script to distinguish application exit codes from various Slurm
error conditions. Also see SLURM_EXIT_ERROR.
SLURM_EXPORT_ENV Same as --export
SLURM_GPU_BIND Same as --gpu-bind
SLURM_GPU_FREQ Same as --gpu-freq
SLURM_GPUS Same as -G, --gpus
SLURM_GPUS_PER_NODE Same as --gpus-per-node
SLURM_GPUS_PER_TASK Same as --gpus-per-task
SLURM_GRES Same as --gres. Also see SLURM_STEP_GRES
SLURM_GRES_FLAGS Same as --gres-flags
SLURM_HINT Same as --hint
SLURM_IMMEDIATE Same as -I, --immediate
SLURM_JOB_ID Same as --jobid
SLURM_JOB_NAME Same as -J, --job-name except within an existing allocation, in
which case it is ignored to avoid using the batch job's name as the
name of each job step.
SLURM_JOB_NUM_NODES Same as -N, --nodes. Total number of nodes in the job’s resource
allocation.
SLURM_KILL_BAD_EXIT Same as -K, --kill-on-bad-exit. Must be set to 0 or 1 to disable or
enable the option.
SLURM_LABELIO Same as -l, --label
SLURM_MEM_BIND Same as --mem-bind
SLURM_MEM_PER_CPU Same as --mem-per-cpu
SLURM_MEM_PER_GPU Same as --mem-per-gpu
SLURM_MEM_PER_NODE Same as --mem
SLURM_MPI_TYPE Same as --mpi
SLURM_NETWORK Same as --network
SLURM_NNODES Same as -N, --nodes. Total number of nodes in the job’s resource
allocation. See SLURM_JOB_NUM_NODES. Included for backwards
compatibility.
SLURM_NO_KILL Same as -k, --no-kill
SLURM_NPROCS Same as -n, --ntasks. See SLURM_NTASKS. Included for backwards
compatibility.
SLURM_NTASKS Same as -n, --ntasks
SLURM_NTASKS_PER_CORE Same as --ntasks-per-core
SLURM_NTASKS_PER_GPU Same as --ntasks-per-gpu
SLURM_NTASKS_PER_NODE Same as --ntasks-per-node
SLURM_NTASKS_PER_SOCKET
Same as --ntasks-per-socket
SLURM_OPEN_MODE Same as --open-mode
SLURM_OVERCOMMIT Same as -O, --overcommit
SLURM_OVERLAP Same as --overlap
SLURM_PARTITION Same as -p, --partition
SLURM_PMI_KVS_NO_DUP_KEYS
If set, then PMI key-pairs will contain no duplicate keys. MPI can
use this variable to inform the PMI library that it will not use
duplicate keys so PMI can skip the check for duplicate keys. This
is the case for MPICH2 and reduces overhead in testing for
duplicates for improved performance
SLURM_POWER Same as --power
SLURM_PROFILE Same as --profile
SLURM_PROLOG Same as --prolog
SLURM_QOS Same as --qos
SLURM_REMOTE_CWD Same as -D, --chdir=
SLURM_REQ_SWITCH When a tree topology is used, this defines the maximum count of
switches desired for the job allocation and optionally the maximum
time to wait for that number of switches. See --switches
SLURM_RESERVATION Same as --reservation
SLURM_RESV_PORTS Same as --resv-ports
SLURM_SEND_LIBS Same as --send-libs
SLURM_SIGNAL Same as --signal
SLURM_SPREAD_JOB Same as --spread-job
SLURM_SRUN_REDUCE_TASK_EXIT_MSG
if set and non-zero, successive task exit messages with the same
exit code will be printed only once.
SLURM_STDERRMODE Same as -e, --error
SLURM_STDINMODE Same as -i, --input
SLURM_STDOUTMODE Same as -o, --output
SLURM_STEP_GRES Same as --gres (only applies to job steps, not to job allocations).
Also see SLURM_GRES
SLURM_STEP_KILLED_MSG_NODE_ID=ID
If set, only the specified node will log when the job or step are
killed by a signal.
SLURM_TASK_EPILOG Same as --task-epilog
SLURM_TASK_PROLOG Same as --task-prolog
SLURM_TEST_EXEC If defined, srun will verify existence of the executable program
along with user execute permission on the node where srun was called
before attempting to launch it on nodes in the step.
SLURM_THREAD_SPEC Same as --thread-spec
SLURM_THREADS Same as -T, --threads
SLURM_THREADS_PER_CORE
Same as --threads-per-core
SLURM_TIMELIMIT Same as -t, --time
SLURM_UNBUFFEREDIO Same as -u, --unbuffered
SLURM_USE_MIN_NODES Same as --use-min-nodes
SLURM_WAIT Same as -W, --wait
SLURM_WAIT4SWITCH Max time waiting for requested switches. See --switches
SLURM_WCKEY Same as -W, --wckey
SLURM_WORKING_DIR -D, --chdir
SLURMD_DEBUG Same as -d, --slurmd-debug. Must be set to 0 or 1 to disable or
enable the option.
SRUN_CONTAINER Same as --container.
SRUN_EXPORT_ENV Same as --export, and will override any setting for
SLURM_EXPORT_ENV.
OUTPUT ENVIRONMENT VARIABLES
srun will set some environment variables in the environment of the executing tasks on the
remote compute nodes. These environment variables are:
SLURM_*_HET_GROUP_# For a heterogeneous job allocation, the environment variables are
set separately for each component.
SLURM_CLUSTER_NAME Name of the cluster on which the job is executing.
SLURM_CPU_BIND_LIST --cpu-bind map or mask list (list of Slurm CPU IDs or masks for this
node, CPU_ID = Board_ID x threads_per_board + Socket_ID x
threads_per_socket + Core_ID x threads_per_core + Thread_ID).
SLURM_CPU_BIND_TYPE --cpu-bind type (none,rank,map_cpu:,mask_cpu:).
SLURM_CPU_BIND_VERBOSE
--cpu-bind verbosity (quiet,verbose).
SLURM_CPU_FREQ_REQ Contains the value requested for cpu frequency on the srun command
as a numerical frequency in kilohertz, or a coded value for a
request of low, medium,highm1 or high for the frequency. See the
description of the --cpu-freq option or the SLURM_CPU_FREQ_REQ input
environment variable.
SLURM_CPUS_ON_NODE Number of CPUs available to the step on this node. NOTE: The
select/linear plugin allocates entire nodes to jobs, so the value
indicates the total count of CPUs on the node. For the
select/cons_res and cons/tres plugins, this number indicates the
number of CPUs on this node allocated to the step.
SLURM_CPUS_PER_TASK Number of cpus requested per task. Only set if the --cpus-per-task
option is specified.
SLURM_DISTRIBUTION Distribution type for the allocated jobs. Set the distribution with
-m, --distribution.
SLURM_GPUS_ON_NODE Number of GPUs available to the step on this node.
SLURM_GTIDS Global task IDs running on this node. Zero origin and comma
separated. It is read internally by pmi if Slurm was built with pmi
support. Leaving the variable set may cause problems when using
external packages from within the job (Abaqus and Ansys have been
known to have problems when it is set - consult the appropriate
documentation for 3rd party software).
SLURM_HET_SIZE Set to count of components in heterogeneous job.
SLURM_JOB_ACCOUNT Account name associated of the job allocation.
SLURM_JOB_CPUS_PER_NODE
Count of CPUs available to the job on the nodes in the allocation,
using the format CPU_count[(xnumber_of_nodes)][,CPU_count
[(xnumber_of_nodes)] ...]. For example:
SLURM_JOB_CPUS_PER_NODE='72(x2),36' indicates that on the first and
second nodes (as listed by SLURM_JOB_NODELIST) the allocation has 72
CPUs, while the third node has 36 CPUs. NOTE: The select/linear
plugin allocates entire nodes to jobs, so the value indicates the
total count of CPUs on allocated nodes. The select/cons_res and
select/cons_tres plugins allocate individual CPUs to jobs, so this
number indicates the number of CPUs allocated to the job.
SLURM_JOB_DEPENDENCY Set to value of the --dependency option.
SLURM_JOB_ID Job id of the executing job.
SLURM_JOB_NAME Set to the value of the --job-name option or the command name when
srun is used to create a new job allocation. Not set when srun is
used only to create a job step (i.e. within an existing job
allocation).
SLURM_JOB_NODELIST List of nodes allocated to the job.
SLURM_JOB_NODES Total number of nodes in the job's resource allocation.
SLURM_JOB_PARTITION Name of the partition in which the job is running.
SLURM_JOB_QOS Quality Of Service (QOS) of the job allocation.
SLURM_JOB_RESERVATION Advanced reservation containing the job allocation, if any.
SLURM_JOBID Job id of the executing job. See SLURM_JOB_ID. Included for
backwards compatibility.
SLURM_LAUNCH_NODE_IPADDR
IP address of the node from which the task launch was initiated
(where the srun command ran from).
SLURM_LOCALID Node local task ID for the process within a job.
SLURM_MEM_BIND_LIST --mem-bind map or mask list (<list of IDs or masks for this node>).
SLURM_MEM_BIND_PREFER --mem-bind prefer (prefer).
SLURM_MEM_BIND_SORT Sort free cache pages (run zonesort on Intel KNL nodes).
SLURM_MEM_BIND_TYPE --mem-bind type (none,rank,map_mem:,mask_mem:).
SLURM_MEM_BIND_VERBOSE
--mem-bind verbosity (quiet,verbose).
SLURM_NODE_ALIASES Sets of node name, communication address and hostname for nodes
allocated to the job from the cloud. Each element in the set if
colon separated and each set is comma separated. For example:
SLURM_NODE_ALIASES=ec0:1.2.3.4:foo,ec1:1.2.3.5:bar
SLURM_NODEID The relative node ID of the current node.
SLURM_NPROCS Total number of processes in the current job or job step. See
SLURM_NTASKS. Included for backwards compatibility.
SLURM_NTASKS Total number of processes in the current job or job step.
SLURM_OVERCOMMIT Set to 1 if --overcommit was specified.
SLURM_PRIO_PROCESS The scheduling priority (nice value) at the time of job submission.
This value is propagated to the spawned processes.
SLURM_PROCID The MPI rank (or relative process ID) of the current process.
SLURM_SRUN_COMM_HOST IP address of srun communication host.
SLURM_SRUN_COMM_PORT srun communication port.
SLURM_CONTAINER OCI Bundle for job. Only set if --container is specified.
SLURM_STEP_ID The step ID of the current job.
SLURM_STEP_LAUNCHER_PORT
Step launcher port.
SLURM_STEP_NODELIST List of nodes allocated to the step.
SLURM_STEP_NUM_NODES Number of nodes allocated to the step.
SLURM_STEP_NUM_TASKS Number of processes in the job step or whole heterogeneous job step.
SLURM_STEP_TASKS_PER_NODE
Number of processes per node within the step.
SLURM_STEPID The step ID of the current job. See SLURM_STEP_ID. Included for
backwards compatibility.
SLURM_SUBMIT_DIR The directory from which the allocation was invoked from.
SLURM_SUBMIT_HOST The hostname of the computer from which the allocation was invoked
from.
SLURM_TASK_PID The process ID of the task being started.
SLURM_TASKS_PER_NODE Number of tasks to be initiated on each node. Values are comma
separated and in the same order as SLURM_JOB_NODELIST. If two or
more consecutive nodes are to have the same task count, that count
is followed by "(x#)" where "#" is the repetition count. For
example, "SLURM_TASKS_PER_NODE=2(x3),1" indicates that the first
three nodes will each execute two tasks and the fourth node will
execute one task.
SLURM_TOPOLOGY_ADDR This is set only if the system has the topology/tree plugin
configured. The value will be set to the names network switches
which may be involved in the job's communications from the system's
top level switch down to the leaf switch and ending with node name.
A period is used to separate each hardware component name.
SLURM_TOPOLOGY_ADDR_PATTERN
This is set only if the system has the topology/tree plugin
configured. The value will be set component types listed in
SLURM_TOPOLOGY_ADDR. Each component will be identified as either
"switch" or "node". A period is used to separate each hardware
component type.
SLURM_UMASK The umask in effect when the job was submitted.
SLURMD_NODENAME Name of the node running the task. In the case of a parallel job
executing on multiple compute nodes, the various tasks will have
this environment variable set to different values on each compute
node.
SRUN_DEBUG Set to the logging level of the srun command. Default value is 3
(info level). The value is incremented or decremented based upon
the --verbose and --quiet options.
SIGNALS AND ESCAPE SEQUENCES
Signals sent to the srun command are automatically forwarded to the tasks it is
controlling with a few exceptions. The escape sequence <control-c> will report the state
of all tasks associated with the srun command. If <control-c> is entered twice within one
second, then the associated SIGINT signal will be sent to all tasks and a termination
sequence will be entered sending SIGCONT, SIGTERM, and SIGKILL to all spawned tasks. If a
third <control-c> is received, the srun program will be terminated without waiting for
remote tasks to exit or their I/O to complete.
The escape sequence <control-z> is presently ignored.
MPI SUPPORT
MPI use depends upon the type of MPI being used. There are three fundamentally different
modes of operation used by these various MPI implementations.
1. Slurm directly launches the tasks and performs initialization of communications through
the PMI2 or PMIx APIs. For example: "srun -n16 a.out".
2. Slurm creates a resource allocation for the job and then mpirun launches tasks using
Slurm's infrastructure (OpenMPI).
3. Slurm creates a resource allocation for the job and then mpirun launches tasks using
some mechanism other than Slurm, such as SSH or RSH. These tasks are initiated outside of
Slurm's monitoring or control. Slurm's epilog should be configured to purge these tasks
when the job's allocation is relinquished, or the use of pam_slurm_adopt is highly
recommended.
See https://slurm.schedmd.com/mpi_guide.html for more information on use of these various
MPI implementations with Slurm.
MULTIPLE PROGRAM CONFIGURATION
Comments in the configuration file must have a "#" in column one. The configuration file
contains the following fields separated by white space:
Task rank
One or more task ranks to use this configuration. Multiple values may be comma
separated. Ranges may be indicated with two numbers separated with a '-' with the
smaller number first (e.g. "0-4" and not "4-0"). To indicate all tasks not
otherwise specified, specify a rank of '*' as the last line of the file. If an
attempt is made to initiate a task for which no executable program is defined, the
following error message will be produced "No executable program specified for this
task".
Executable
The name of the program to execute. May be fully qualified pathname if desired.
Arguments
Program arguments. The expression "%t" will be replaced with the task's number.
The expression "%o" will be replaced with the task's offset within this range (e.g.
a configured task rank value of "1-5" would have offset values of "0-4"). Single
quotes may be used to avoid having the enclosed values interpreted. This field is
optional. Any arguments for the program entered on the command line will be added
to the arguments specified in the configuration file.
For example:
$ cat silly.conf
###################################################################
# srun multiple program configuration file
#
# srun -n8 -l --multi-prog silly.conf
###################################################################
4-6 hostname
1,7 echo task:%t
0,2-3 echo offset:%o
$ srun -n8 -l --multi-prog silly.conf
0: offset:0
1: task:1
2: offset:1
3: offset:2
4: linux15.llnl.gov
5: linux16.llnl.gov
6: linux17.llnl.gov
7: task:7
EXAMPLES
This simple example demonstrates the execution of the command hostname in eight tasks. At
least eight processors will be allocated to the job (the same as the task count) on
however many nodes are required to satisfy the request. The output of each task will be
proceeded with its task number. (The machine "dev" in the example below has a total of
two CPUs per node)
$ srun -n8 -l hostname
0: dev0
1: dev0
2: dev1
3: dev1
4: dev2
5: dev2
6: dev3
7: dev3
The srun -r option is used within a job script to run two job steps on disjoint nodes in
the following example. The script is run using allocate mode instead of as a batch job in
this case.
$ cat test.sh
#!/bin/sh
echo $SLURM_JOB_NODELIST
srun -lN2 -r2 hostname
srun -lN2 hostname
$ salloc -N4 test.sh
dev[7-10]
0: dev9
1: dev10
0: dev7
1: dev8
The following script runs two job steps in parallel within an allocated set of nodes.
$ cat test.sh
#!/bin/bash
srun -lN2 -n4 -r 2 sleep 60 &
srun -lN2 -r 0 sleep 60 &
sleep 1
squeue
squeue -s
wait
$ salloc -N4 test.sh
JOBID PARTITION NAME USER ST TIME NODES NODELIST
65641 batch test.sh grondo R 0:01 4 dev[7-10]
STEPID PARTITION USER TIME NODELIST
65641.0 batch grondo 0:01 dev[7-8]
65641.1 batch grondo 0:01 dev[9-10]
This example demonstrates how one executes a simple MPI job. We use srun to build a list
of machines (nodes) to be used by mpirun in its required format. A sample command line and
the script to be executed follow.
$ cat test.sh
#!/bin/sh
MACHINEFILE="nodes.$SLURM_JOB_ID"
# Generate Machinefile for mpi such that hosts are in the same
# order as if run via srun
#
srun -l /bin/hostname | sort -n | awk '{print $2}' > $MACHINEFILE
# Run using generated Machine file:
mpirun -np $SLURM_NTASKS -machinefile $MACHINEFILE mpi-app
rm $MACHINEFILE
$ salloc -N2 -n4 test.sh
This simple example demonstrates the execution of different jobs on different nodes in the
same srun. You can do this for any number of nodes or any number of jobs. The
executables are placed on the nodes sited by the SLURM_NODEID env var. Starting at 0 and
going to the number specified on the srun command line.
$ cat test.sh
case $SLURM_NODEID in
0) echo "I am running on "
hostname ;;
1) hostname
echo "is where I am running" ;;
esac
$ srun -N2 test.sh
dev0
is where I am running
I am running on
dev1
This example demonstrates use of multi-core options to control layout of tasks. We
request that four sockets per node and two cores per socket be dedicated to the job.
$ srun -N2 -B 4-4:2-2 a.out
This example shows a script in which Slurm is used to provide resource management for a
job by executing the various job steps as processors become available for their dedicated
use.
$ cat my.script
#!/bin/bash
srun -n4 prog1 &
srun -n3 prog2 &
srun -n1 prog3 &
srun -n1 prog4 &
wait
This example shows how to launch an application called "server" with one task, 8 CPUs and
16 GB of memory (2 GB per CPU) plus another application called "client" with 16 tasks, 1
CPU per task (the default) and 1 GB of memory per task.
$ srun -n1 -c16 --mem-per-cpu=1gb server : -n16 --mem-per-cpu=1gb client
COPYING
Copyright (C) 2006-2007 The Regents of the University of California. Produced at Lawrence
Livermore National Laboratory (cf, DISCLAIMER).
Copyright (C) 2008-2010 Lawrence Livermore National Security.
Copyright (C) 2010-2021 SchedMD LLC.
This file is part of Slurm, a resource management program. For details, see
<https://slurm.schedmd.com/>.
Slurm is free software; you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
Slurm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
SEE ALSO
salloc(1), sattach(1), sbatch(1), sbcast(1), scancel(1), scontrol(1), squeue(1),
slurm.conf(5), sched_setaffinity (2), numa (3) getrlimit (2)