chrt — manipulate real-time attributes of a process
chrt [options] prio command
[arg...]
chrt [options] −p [prio] pid
chrt(1) sets or retrieves
the real-time scheduling attributes of an existing PID, or
runs COMMAND with the given attributes. Both policy (one of
SCHED_OTHER, SCHED_FIFO, SCHED_RR, SCHED_BATCH, or SCHED_IDLE) and 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.
−p,−−pidoperate on an existing PID and do not launch a new task
−b,−−batchset scheduling policy to SCHED_BATCH (Linux specific)
−f,−−fifoset scheduling policy to SCHED_FIFO
−i,−−idleset schedulng policy to SCHED_IDLE (Linux specific)
−m,−−maxshow minimum and maximum valid priorities, then exit
−o,−−otherset policy scheduling policy to SCHED_OTHER
−r,−−rrset scheduling policy to SCHED_RR (the default)
−R,−−reset−on−forkadd SCHED_RESET_ON_FORK flag to the
SCHED_FIFO or
SCHED_RR scheduling
policy (Linux specific)
−v,−−verboseshow status information
−h,−−helpdisplay usage information and exit
−V,−−versiondisplay version information and exit
chrt prio command [arguments]
chrt -p pid
chrt -p prio 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.
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.
taskset(1), nice(1), renice(1)
See sched_setscheduler(2) for a description of the Linux scheduling scheme.
The chrt command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
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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 as published by the Free Software Foundation; either version 2 of the License. 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 manual; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. 2002-05-11 Robert Love <rmltech9.net> Initial version |