HWLOC-CALC(1)
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 --physi-cal, 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 --physi-cal, 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.