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. Both the policy (one of SCHED_OTHER, SCHED_FIFO, SCHED_RR, SCHED_BATCH, or SCHED_IDLE) and the priority can be set and
retrieved.
The SCHED_BATCH policy is
supported since Linux 2.6.16. The SCHED_IDLE policy is supported since Linux
2.6.23.
The SCHED_RESET_ON_FORK flag
for policies SCHED_RR and SCHED_FIFO is supported since Linux
2.6.31.
−a,
−−all−tasksSet or retrieve the scheduling attributes of all the tasks (threads) for a given PID.
−b,
−−batchSet scheduling policy to SCHED_BATCH (Linux-specific). The
priority argument has to be set to zero.
−f,
−−fifoSet scheduling policy to SCHED_FIFO.
−i,
−−idleSet scheduling policy to SCHED_IDLE (Linux-specific). The
priority argument has to be set to zero.
−m,
−−maxShow minimum and maximum valid priorities, then exit.
−o,
−−otherSet policy scheduling policy to SCHED_OTHER.
−p,
−−pidOperate on an existing PID and do not launch a new task.
−R,
−−reset−on−forkAdd SCHED_RESET_ON_FORK flag to the
SCHED_FIFO or
SCHED_RR scheduling
policy (Linux-specific).
−r,
−−rrSet scheduling policy to SCHED_RR. When policy is not defined
the SCHED_RR is used as
default.
−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)
See sched_setscheduler(2) for a description of the Linux scheduling scheme.
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.
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 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. |