chrt — manipulate the real-time attributes of a process
chrt [options] priority
command [ argument... ]
chrt [options] −p [priority] pid
chrt sets or
retrieves the real-time scheduling attributes of an existing
pid, or runs
command with the
given attributes.
−o, −−otherSet scheduling policy to SCHED_OTHER. This is the default
Linux scheduling policy.
−f, −−fifoSet scheduling policy to SCHED_FIFO.
−r, −−rrSet scheduling policy to SCHED_RR. When no policy is defined,
the SCHED_RR is used as
the default.
−b, −−batchSet scheduling policy to SCHED_BATCH (Linux-specific,
supported since 2.6.16). The priority argument has to
be set to zero.
−i, −−idleSet scheduling policy to SCHED_IDLE (Linux-specific, supported
since 2.6.23). The priority argument has to be set to
zero.
−d,
−−deadlineSet scheduling policy to SCHED_DEADLINE (Linux-specific,
supported since 3.14). The priority argument has to be
set to zero. See also −−sched−runtime,
−−sched−deadline and
−−sched−period. The
relation between the options required by the kernel is
runtime <= deadline <= period. chrt copies
period to
deadline
if −−sched−deadline is
not specified and deadline to
runtime
if −−sched−runtime is
not specified. It means that at least −−sched−period has to
be specified. See sched(7) for more
details.
−T, −−sched−runtime
nanosecondsSpecifies runtime parameter for SCHED_DEADLINE policy (Linux-specific).
−P, −−sched−period
nanosecondsSpecifies period parameter for SCHED_DEADLINE policy (Linux-specific).
−D, −−sched−deadline
nanosecondsSpecifies deadline parameter for SCHED_DEADLINE policy (Linux-specific).
−R, −−reset−on−forkAdd SCHED_RESET_ON_FORK flag to the
SCHED_FIFO or
SCHED_RR scheduling
policy (Linux-specific, supported since 2.6.31).
−a,
−−all−tasksSet or retrieve the scheduling attributes of all the tasks (threads) for a given PID.
−m,
−−maxShow minimum and maximum valid priorities, then exit.
−p,
−−pidOperate on an existing PID and do not launch a new task.
−v,
−−verboseShow status information.
−V,
−−versionDisplay version information and exit.
−h,
−−helpDisplay help text and exit.
chrt
priority
command[arguments]
chrt −p
pid
chrt −r −p priority pid
A user must possess CAP_SYS_NICE to change the scheduling
attributes of a process. Any user can retrieve the scheduling
information.
Only SCHED_FIFO,
SCHED_OTHER and SCHED_RR are part of POSIX 1003.1b Process
Scheduling. The other scheduling attributes may be ignored on
some systems.
Linux' default scheduling policy is SCHED_OTHER.
taskset(1), nice(1), renice(1), sched(7)
See sched_setscheduler(2) for a description of the Linux scheduling scheme.
The chrt command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
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chrt(1) manpage Copyright (C) 2004 Robert Love Copyright (C) 2015 Karel Zak <kzakredhat.com> This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2, as published by the Free Software Foundation. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |