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hwloc-mask

Langue: en

Autres versions - même langue

Version: Jul 20, 2010 (fedora - 01/12/10)

Section: 1 (Commandes utilisateur)

NAME

hwloc-calc - Operate on cpu mask strings and objects

SYNOPSIS

hwloc-calc [options] <location1> [<location2> [...] ]  

OPTIONS

-p --physical
Use OS/physical indexes instead of logical indexes for both input and output.
-l --logical
Use logical indexes instead of physical/OS indexes for both input and output (default).
--pi --physical-input
Use OS/physical indexes instead of logical indexes for input.
--li --logical-input
Use logical indexes instead of physical/OS indexes for input (default).
--po --physical-input
Use OS/physical indexes instead of logical indexes for output.
--lo --logical-output
Use logical indexes instead of physical/OS indexes for output (default).
--PUlist
Report the comma-separated list of processing units' indexes instead of the cpu mask string. When combined with --physical, the list is convenient to pass to external tools such as taskset or numactl --physcpubind.
--nodelist
Report the comma-separated list of memory nodes' indexes instead of the cpu mask string. When combined with --physical, the list is convenient to pass to external tools such as numactl --membind.
--objects
Report the list of highest objects instead of the cpu mask string.
--single
Singlify the output to a single CPU.
-v
Verbose output.
--version
Report version and exit.

DESCRIPTION

hwloc-calc generates and manipulates CPU mask strings or objects. Both input and output may be either objects (with physical or logical indexes) or CPU mask strings (no logical or physical index involved).

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-calc utility.

EXAMPLES

hwloc-calc's operation is best described through several examples.

To display the CPU mask corresponding to the second socket:


    $ hwloc-calc socket:1
    0x000000f0

To display the CPU mask corresponding to the third socket, excluding its even numbered logical processors:


    $ hwloc-calc socket:2 ~PU:even
    0x00000c00

To combine two CPU masks:


    $ hwloc-calc 0x0000ffff 0xff000000
    0xff00ffff

To display the list of logical processors included in the second socket:


    $ hwloc-calc --PUlist socket:1
    0,2,4,6

To display the list of NUMA nodes, by physical indexes, that intersect a given CPU mask:


    $ hwloc-calc --physical --nodelist 0xf0f0f0f0
    0,2

To display the physical index of a processor given by its logical index:


    $ hwloc-calc PU:2 --physical-output --PUlist
    3

To combine both physical and logical indexes as input:


    $ hwloc-calc PU:2 --physical-input PU:3
    0x0000000c

RETURN VALUE

Upon successful execution, hwloc-calc displays the CPU mask string. The return value is 0.

hwloc-calc 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)
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