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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | USAGE | PERMISSIONS | AUTHORS | COPYRIGHT | SEE ALSO | AVAILABILITY | COLOPHON |
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TASKSET(1) User Commands TASKSET(1)
taskset - set or retrieve a process's CPU affinity
taskset [options] mask command [argument...]
taskset [options] -p [mask] pid
taskset 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.
-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.
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
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.
Written by Robert M. Love.
Copyright © 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.
chrt(1), nice(1), renice(1), sched_getaffinity(2),
sched_setaffinity(2)
See sched(7) for a description of the Linux scheduling scheme.
The taskset command is part of the util-linux package and is
available from
https://www.kernel.org/pub/linux/utils/util-linux/.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found
at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you
have a bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
util-linux August 2014 TASKSET(1)
Pages that refer to this page: chrt(1), sched_setaffinity(2), cpuset(7), sched(7), migratepages(8)
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