plucky (1) hwloc-annotate.1.gz
NAME
hwloc-annotate - Modify attributes in a XML topology
SYNOPSIS
hwloc-annotate [options] <input.xml> <output.xml> -- <location1> <location2> ... -- <mode> <annotation>
hwloc-annotate [options] <input.xml> <output.xml> <location> <mode> <annotation>
Note that hwloc(7) provides a detailed explanation of the hwloc system and of valid <location> formats;
it should be read before reading this man page.
OPTIONS
--ri Remove all info attributes that exist with the same name before adding the new one. This
option is only accepted in "info" mode. If the info value is omitted, existing infos are
replaced with nothing.
--ci Clear the existing info attributes in the target objects before annotating. If no new
annotation has to be added after clearing, mode should be set to none.
--cu Clear the existing userdata from the target objects. If nothing else has to be performed after
clearing, mode should be set to none.
--cd Clear the existing distances from the topology. If nothing else has to be performed after
clearing, mode should be set to none.
--version Report version and exit.
-h --help Display help message and exit.
DESCRIPTION
hwloc-annotate loads a topology from a XML file, adds some annotations, and export the resulting topology
to another XML file. The input and output files may be the same.
The annotation may be string info attributes. This is specified by the mode:
info <name> <value>
Specifies a new string info attribute whose name is name and value is value.
subtype <subtype>
Specifies that the subtype attribute of the object should now be subtype. If an empty string is
given, the subtype is removed.
size <size>
Specifies the size of a cache or NUMA node. The value may be suffixed with kB, KiB, MB, MiB, GB,
GiB, etc.
misc <name>
Specifies a new Misc object name.
memattr <name> <flags>
Register a new memory attribute whose name is name and flags is flags. location is ignored in
this mode.
Flags may be given as numeric values or as a comma-separated list of flag names that are passed to
hwloc_memattr_register(). Those names may be substrings of actual flag names as long as a single
one matches. For instance, a value of 1 (or higher) means that highest values are considered best
for this attribute.
memattr <name> <initiator> <value>
Set the memory attribute (whose name is name) from initiator initiator (either an object or a CPU-
set) to target NUMA node location to value value.
If this attribute does not require specific initiators, initiator is ignored.
Standard attribute names are Capacity, Locality, Bandwidth, and Latency. All existing attributes
in the input topology may be listed with
$ lstopo --memattrs -i input.xml
cpukind <cpuset> <efficiency> <flags> [<infoname> <infovalue>]
Specifies the kind of CPU for PUs listed in the given cpuset. location is ignored in this mode.
efficiency is an abstracted efficiency value that will enforce ranking of kinds. It should be -1
if unknown.
flags must be 0 for now.
If infoname and infovalue are given and non-empty, they are added as info attributes to this kind
of CPU.
See the function hwloc_cpukinds_register() for details.
distances <filename> [<flags>]
Specifies new distances to be added to the topology using specifications in <filename>. The
optional flags (0 unless specified) corresponds to the flags given to the function
hwloc_distances_set(). location is ignored in this mode.
The real first line of the pointed file must be a integer representing a distances kind as defined
in hwloc/distances.h. The second line is the number of objects involved in the distances. The
next lines contain one object each. The next lines contain one distance value each, or a single
line may be given with a integer combination of format x*y or x*y*z. An optional line before all
others may start with name= to specify the name of the distances structure if any.
distances-transform <name> links
Transform a bandwidth distances structure named <name> into links. See the documentation of
HWLOC_DISTANCES_TRANSFORM_LINKS in hwloc/distances.h for details.
distances-transform <name> merge-switch-ports
When switches appear in the matrix as different ports, merge all of them into a single port for
clarity. This currently only applies to the NVLinkBandwidth matrix between NVIDIA GPUs. See the
documentation of HWLOC_DISTANCES_TRANSFORM_MERGE_SWITCH_PORTS in hwloc/distances.h for details.
distances-transform <name> transitive-closure
If objects are connected across a switch, apply a transitive-closure to report the bandwidth
through that switch. This currently only applies to the NVLinkBandwidth matrix between NVIDIA
GPUs. The bandwidth between all pairs of GPUs will be exposed instead of bandwidths between
single GPUs and single NVSwitch ports. See the documentation of
HWLOC_DISTANCES_TRANSFORM_TRANSITIVE_CLOSURE in hwloc/distances.h for details.
distances-transform <name> remove-obj <obj>
Remove the given object from the distances structure named <name>.
distances-transform <name> replace-objs <oldtype> <newtype>
Replace objects of type <oldtype> in distances structure named <name> with objects of type
<newtype> with same locality. If <oldtype> or <newtype> are not object types, they are assumed
subtypes of OS devices, e.g. "NVML" or "OpenCL". See the documentation of
hwloc_get_obj_with_same_locality() in hwloc/helper.h for details.
If <newtype> is "NULL", objects are removed from the distances structure.
none No new annotation is added. This is useful when clearing existing attributes.
Annotations may be added to one specific object in the topology, all of them, or all of a given type.
This is specified by the location (see also EXAMPLES below). Multiple locations may be affected if they
are specified between --. Objects may be specified as location tuples, as explained in hwloc(7).
However hexadecimal bitmasks are not accepted since they may correspond to multiple objects.
NOTE: The existing annotations may be listed with hwloc-info.
NOTE: It is highly recommended that you read the hwloc(7) overview page before reading this man page.
Most of the concepts described in hwloc(7) directly apply to the hwloc-annotate utility.
EXAMPLES
hwloc-annotate's operation is best described through several examples.
Add an info attribute to all Core and PU objects:
$ hwloc-annotate input.xml output.xml -- Core:all PU:all -- info infoname infovalue
Only add to all Core objects:
$ hwloc-annotate input.xml output.xml Core:all info infoname infovalue
Add an info attribute to OS device #2 and #3:
$ hwloc-annotate input.xml output.xml os:2-3 info infoname infovalue
Change package objects to green with red text in the lstopo graphical output:
$ hwloc-annotate topo.xml topo.xml package:all info lstopoStyle "Background=#00ff00;Text=#ff0000"
$ lstopo -i topo.xml
Add a Misc object named "foobar" under the root object of the topology and modify the input XML directly:
$ hwloc-annotate file.xml file.xml root misc foobar
Examples with memory attributes
Set the memory attribute latency to 123 nanoseconds from the PUs in the first package to the first NUMA
node:
$ hwloc-annotate topo.xml topo.xml numanode:0 memattr Latency $(hwloc-calc package:0) 123
Register a memory attribute MyApplicationPerformance (with flags specifying that it requires an initiator
and reports higher values first) and set its value for initiator CPU-set 0x11 to NUMA node #2 to 2345:
$ hwloc-annotate topo.xml topo.xml ignored memattr MyApplicationPerformance need_init,higher
$ hwloc-annotate topo.xml topo.xml numanode:2 memattr MyApplicationPerformance 0x11 2345
To clarify that NUMA node #0 is DDR while NUMA node #1 is HBM:
$ hwloc-annotate topo.xml topo.xml numa:0 subtype DDR
$ hwloc-annotate topo.xml topo.xml numa:1 subtype HBM
Examples with CPU kinds
Specify that PU 0-3 and PU 4-7 are of different kinds, and the latter is more efficient:
$ hwloc-annotate topo.xml topo.xml dummy cpukind 0x0f 0 0 CoreType Small
$ hwloc-annotate topo.xml topo.xml dummy cpukind 0xf0 1 0 CoreType Big
Examples with distances matrices
Replace NUMA nodes with Packages in the NUMALatency distances matrix, when they have the exact same
locality.
$ hwloc-annotate topo.xml topo.xml -- dummy -- distances-transform NUMALatency replace-objs numanode
packages
Remove NUMA node #3 from the NUMALatency distances matrix:
$ hwloc-annotate topo.xml topo.xml -- dummy -- distances-transform NUMALatency remove-obj numa:3
Merge all NVSwitch ports bandwidth information into a single port in the NVLinkBandwidth matrix:
$ hwloc-annotate topo.xml topo.xml -- dummy -- distances-transform NVLinkBandwidth merge-switch-ports
Apply a transitive closure to get inter-GPU bandwidth across NVSwitches in the NVLinkBandwidth matrix:
$ hwloc-annotate topo.xml topo.xml -- dummy -- distances-transform NVLinkBandwidth transitive-closure
RETURN VALUE
Upon successful execution, hwloc-annotate generates the output topology. The return value is 0.
hwloc-annotate will return nonzero if any kind of error occurs, such as (but not limited to) failure to
parse the command line.
SEE ALSO
hwloc(7), lstopo(1), hwloc-info(1)