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   taskset    ( 1 )

установить или получить привязку к процессору процесса (set or retrieve a process's CPU affinity)

Имя (Name)

taskset - set or retrieve a process's CPU affinity

Синопсис (Synopsis)

taskset [options] mask command [argument...]

taskset [options] -p [mask] pid


Описание (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.


Параметры (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.


Использование (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


Разрешения (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.