CHRTSection: Linux User's Manual (1)
Updated: Apr 2003
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NAMEchrt - manipulate real-time attributes of a process
SYNOPSISchrt [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.
- -p, --pid
- operate on an existing PID and do not launch a new task
- -b, --batch
- set scheduling policy to SCHED_BATCH (Linux specific)
- -f, --fifo
- set scheduling policy to SCHED_FIFO
- -i, --idle
- set schedulng policy to SCHED_IDLE (Linux specific)
- -m, --max
- show minimum and maximum valid priorities, then exit
- -o, --other
- set policy scheduling policy to SCHED_OTHER
- -r, --rr
- set scheduling policy to SCHED_RR (the default)
- -h, --help
- display usage information and exit
- -v, --version
- output version information and exit
- The default behavior is to run a new command::
- chrt prio command [arguments]
- You can also retrieve the real-time attributes of an existing task:
- chrt -p pid
- Or set them:
- chrt -p prio pid
PERMISSIONSA user must possess CAP_SYS_NICE to change the scheduling attributes of a process. Any user can retrieve the scheduling information.
NOTESOnly 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.
AUTHORWritten by Robert M. Love.
COPYRIGHTCopyright © 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.
SEE ALSOtaskset(1), nice(1), renice(1)
See sched_setscheduler(2) for a description of the Linux scheduling scheme.
AVAILABILITYThe chrt command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
This document was created by man2html, using the manual pages.
Time: 05:29:02 GMT, December 24, 2015