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TASKSET(1) User Commands TASKSET(1)
NAME
taskset - set or retrieve a process's CPU affinity
SYNOPSIS
taskset [options] mask command [argument...]
taskset [options] -p [mask] pid
DESCRIPTION
The taskset command is used to set or retrieve the CPU affinity of a running process given
its pid, or to launch a new command with a given CPU affinity. CPU affinity is a scheduler
property that "bonds" a process to a given set of CPUs on the system. The Linux scheduler
will honor the given CPU affinity and the process will not run on any other CPUs. Note
that the Linux scheduler also supports natural CPU affinity: the scheduler attempts to
keep processes on the same CPU as long as practical for performance reasons. Therefore,
forcing a specific CPU affinity is useful only in certain applications.
The CPU affinity is represented as a bitmask, with the lowest order bit corresponding to
the first logical CPU and the highest order bit corresponding to the last logical CPU. Not
all CPUs may exist on a given system but a mask may specify more CPUs than are present. A
retrieved mask will reflect only the bits that correspond to CPUs physically on the
system. If an invalid mask is given (i.e., one that corresponds to no valid CPUs on the
current system) an error is returned. The masks may be specified in hexadecimal (with or
without a leading "0x"), or as a CPU list with the --cpu-list option. For example,
0x00000001
is processor #0,
0x00000003
is processors #0 and #1,
0xFFFFFFFF
is processors #0 through #31,
32
is processors #1, #4, and #5,
--cpu-list 0-2,6
is processors #0, #1, #2, and #6.
--cpu-list 0-10:2
is processors #0, #2, #4, #6, #8 and #10. The suffix ":N" specifies stride in the
range, for example 0-10:3 is interpreted as 0,3,6,9 list.
When taskset returns, it is guaranteed that the given program has been scheduled to a
legal CPU.
OPTIONS
-a, --all-tasks
Set or retrieve the CPU affinity of all the tasks (threads) for a given PID.
-c, --cpu-list
Interpret mask as numerical list of processors instead of a bitmask. Numbers are
separated by commas and may include ranges. For example: 0,5,8-11.
-p, --pid
Operate on an existing PID and do not launch a new task.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
USAGE
The default behavior is to run a new command with a given affinity mask:
taskset mask command [arguments]
You can also retrieve the CPU affinity of an existing task:
taskset -p pid
Or set it:
taskset -p mask pid
PERMISSIONS
A user can change the CPU affinity of a process belonging to the same user. A user must
possess CAP_SYS_NICE to change the CPU affinity of a process belonging to another user. A
user can retrieve the affinity mask of any process.
AUTHORS
Written by Robert M. Love.
COPYRIGHT
Copyright (C) 2004 Robert M. Love. This is free software; see the source for copying
conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
SEE ALSO
chrt(1), nice(1), renice(1), sched_getaffinity(2), sched_setaffinity(2)
See sched(7) for a description of the Linux scheduling scheme.
REPORTING BUGS
For bug reports, use the issue tracker at https://github.com/karelzak/util-linux/issues.
AVAILABILITY
The taskset command is part of the util-linux package which can be downloaded from Linux
Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.
util-linux 2.37.2 2021-06-02 TASKSET(1)
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On Apache
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