Provided by: numactl_2.0.8~rc3-1_amd64 bug

NAME

       numactl - Control NUMA policy for processes or shared memory

SYNOPSIS

       numactl  [  --interleave  nodes ] [ --preferred node ] [ --membind nodes ] [ --cpunodebind
       nodes ] [ --physcpubind cpus ] [ --localalloc ] [--] command {arguments ...}
       numactl --show
       numactl --hardware
       numactl [ --huge ] [ --offset offset ] [  --shmmode  shmmode  ]  [  --length  length  ]  [
       --strict ]
       [ --shmid id ] --shm shmkeyfile | --file tmpfsfile
       [ --touch ] [ --dump ] [ --dump-nodes ] memory policy

DESCRIPTION

       numactl  runs  processes  with a specific NUMA scheduling or memory placement policy.  The
       policy is set for command and inherited by all of its children.  In addition  it  can  set
       persistent policy for shared memory segments or files.

       Use  --  before  command  if  using  command  options  that could be confused with numactl
       options.

       nodes may be specified as N,N,N or  N-N or N,N-N or  N-N,N-N and so forth.  Relative nodes
       may  be  specifed as +N,N,N or  +N-N or +N,N-N and so forth. The + indicates that the node
       numbers are relative to the process' set of allowed nodes in its current cpuset.   A  !N-N
       notation  indicates the inverse of N-N, in other words all nodes except N-N.  If used with
       + notation, specify !+N-N. When same is specified the previous nodemask specified  on  the
       command line is used.  all means all nodes in the current cpuset.

       Instead of a number a node can also be:

       netdev:DEV                 The node connected to network device DEV.
       file:PATH                  The node the block device of PATH.
       ip:HOST                    The node of the network device of HOST
       block:PATH                 The node of block device PATH
       pci:[seg:]bus:dev[:func]   The node of a PCI device.

       Note  that  block  resolves  the kernel block device names only for udev names in /dev use
       file:

       Policy settings are:

       --interleave=nodes, -i nodes
              Set a memory interleave policy. Memory will  be  allocated  using  round  robin  on
              nodes.   When memory cannot be allocated on the current interleave target fall back
              to other nodes.  Multiple nodes may be specified  on  --interleave,  --membind  and
              --cpunodebind.

       --membind=nodes, -m nodes
              Only  allocate  memory  from  nodes.  Allocation will fail when there is not enough
              memory available on these nodes.  nodes may be specified as noted above.

       --cpunodebind=nodes, -N nodes
              Only execute command on the CPUs of nodes.  Note that nodes may consist of multiple
              CPUs.  nodes may be specified as noted above.

       --physcpubind=cpus, -C cpus
              Only  execute  process on cpus.  This accepts cpu numbers as shown in the processor
              fields of /proc/cpuinfo, or relative cpus as in relative  to  the  current  cpuset.
              You  may  specify "all", which means all cpus in the current cpuset.  Physical cpus
              may be specified as N,N,N or  N-N or N,N-N or  N-N,N-N and so forth.  Relative cpus
              may be specifed as +N,N,N or  +N-N or +N,N-N and so forth. The + indicates that the
              cpu numbers are relative to the process' set of allowed cpus in its current cpuset.
              A  !N-N  notation indicates the inverse of N-N, in other words all cpus except N-N.
              If used with + notation, specify !+N-N.

       --localalloc, -l
              Always allocate on the current node.

       --preferred=node
              Preferably allocate memory on node, but if memory cannot be  allocated  there  fall
              back  to  other  nodes.   This  option  takes  only a single node number.  Relative
              notation may be used.

       --show, -s
              Show NUMA policy settings of the current process.

       --hardware, -H
              Show inventory of available nodes on the system.

       Numactl can set up policy for a SYSV shared memory segment or a file in shmfs/hugetlbfs.

       This policy is persistent and will be used by all mappings from that  shared  memory.  The
       order  of  options matters here.  The specification must at least include either of --shm,
       --shmid, --file to specify the shared memory segment or file  and  a  memory  policy  like
       described above ( --interleave, --localalloc, --preferred, --membind ).

       --huge
       When  creating  a SYSV shared memory segment use huge pages.  Only valid before --shmid or
       --shm

       --offset
       Specify offset into the shared memory segment. Default 0.  Valid units are m (for  MB),  g
       (for GB), k (for KB), otherwise it specifies bytes.

       --strict
       Give  an  error  when a page in the policied area in the shared memory segment already was
       faulted in with a conflicting policy. Default is to silently ignore this.

       --shmmode shmmode
       Only valid before --shmid or --shm When creating a shared memory segment set it to numeric
       mode shmmode.

       --length length
       Apply  policy to length range in the shared memory segment or make the segment length long
       Default is to use the remaining length Required when a shared memory  segment  is  created
       and  specifies the length of the new segment then. Valid units are m (for MB), g (for GB),
       k (for KB), otherwise it specifies bytes.

       --shmid id
       Create or use an shared memory segment with numeric ID id

       --shm shmkeyfile
       Create or use an  shared  memory  segment,  with  the  ID  generated  using  ftok(3)  from
       shmkeyfile

       --file tmpfsfile
       Set policy for a file in tmpfs or hugetlbfs

       --touch
       Touch  pages  to enforce policy early. Default is to not touch them, the policy is applied
       when an applications maps and accesses a page.

       --dump
       Dump policy in the specified range.

       --dump-nodes
       Dump all nodes of the specific range (very verbose!)

       Valid node specifiers

       all                 All nodes
       number              Node number
       number1{,number2}   Node number1 and Node number2
       number1-number2     Nodes from number1 to number2
       ! nodes             Invert selection of the following specification.

EXAMPLES

       numactl --physcpubind=+0-4,8-12 myapplic arguments Run myapplic on cpus 0-4  and  8-12  of
       the current cpuset.

       numactl   --interleave=all   bigdatabase  arguments  Run  big  database  with  its  memory
       interleaved on all CPUs.

       numactl --cpunodebind=0 --membind=0,1 process Run process on node 0 with memory  allocated
       on node 0 and 1.

       numactl  --cpunodebind=0  --membind=0,1  --  process  -l Run process as above, but with an
       option (-l) that would be confused with a numactl option.

       numactl --nodebind=netdev:eth0 --membind=netdev:eth0 network-server Run network-server  on
       the node of network device eth0 with its memory also in the same node.

       numactl --preferred=1 numactl --show Set preferred node 1 and show the resulting state.

       numactl --interleave=all --shmkeyfile /tmp/shmkey Interleave all of the sysv shared memory
       region specified by /tmp/shmkey over all nodes.

       Place a tmpfs file on 2 nodes:
         numactl --membind=2 dd if=/dev/zero of=/dev/shm/A bs=1M count=1024
         numactl --membind=3 dd if=/dev/zero of=/dev/shm/A seek=1024 bs=1M count=1024

       numactl --localalloc /dev/shm/file Reset the policy for the shared memory file file to the
       default localalloc policy.

NOTES

       Requires an NUMA policy aware kernel.

       Command  is  not  executed  using  a shell. If you want to use shell metacharacters in the
       child use sh -c as wrapper.

       Setting policy for a hugetlbfs file does currently not work because it cannot be  extended
       by truncate.

       Shared  memory segments larger than numactl's address space cannot be completely policied.
       This could be a problem on 32bit architectures.  Changing it piece by piece may work.

       The old --cpubind which accepts node numbers, not cpu numbers, is deprecated and  replaced
       with the new --cpunodebind and --physcpubind options.

FILES

       /proc/cpuinfo for the listing of active CPUs. See proc(5) for details.

       /sys/devices/system/node/node*/numastat for NUMA memory hit statistics.

COPYRIGHT

       Copyright  2002,2004  Andi  Kleen, SuSE Labs.  numactl and the demo programs are under the
       GNU General Public License, v.2

SEE ALSO

       set_mempolicy(2)   ,   get_mempolicy(2)    ,    mbind(2)    ,    sched_setaffinity(2)    ,
       sched_getaffinity(2) , proc(5) , ftok(3) , shmat(2) , migratepages(8)