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hwloc-mask

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).

--proclist

Report the comma-separated list of processors' 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

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

    hwloc-calc socket:2 ~proc:even

To combine two CPU masks:

    hwloc-calc 0x0000ffff 0xff000000

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

    hwloc-calc --proclist socket:1

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

   hwloc-calc --physical --nodelist 0xf0f0f0f0

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

   hwloc-calc proc:2 --physical-output --proclist

To combine both physical and logical indexes as input:

   hwloc-calc proc:2 --physical-input proc:3

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)