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CHRT

Section: User Commands (1)
Updated: August 2014
Index Return to Main Contents
 

NAME

chrt - manipulate the real-time attributes of a process  

SYNOPSIS

chrt [options] priority command [argument...]
chrt [options] -p [prioritypid  

DESCRIPTION

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.  

OPTIONS

-a--all-tasks
Set or retrieve the scheduling attributes of all the tasks (threads) for a given PID.
-b--batch
Set scheduling policy to SCHED_BATCH (Linux-specific). The priority argument has to be set to zero.
-f--fifo
Set scheduling policy to SCHED_FIFO.
-i--idle
Set scheduling policy to SCHED_IDLE (Linux-specific). The priority argument has to be set to zero.
-m--max
Show minimum and maximum valid priorities, then exit.
-o--other
Set policy scheduling policy to SCHED_OTHER.
-p--pid
Operate on an existing PID and do not launch a new task.
-R--reset-on-fork
Add SCHED_RESET_ON_FORK flag to the SCHED_FIFO or SCHED_RR scheduling policy (Linux-specific).
-r--rr
Set scheduling policy to SCHED_RR. When policy is not defined the SCHED_RR is used as default.
-v--verbose
Show status information.
-V--version
Display version information and exit.
-h--help
Display help text and exit.
 

USAGE

The default behavior is to run a new command:
chrt priority command [arguments]
You can also retrieve the real-time attributes of an existing task:
chrt -p pid
Or set them:
chrt -r -p priority pid
 

PERMISSIONS

A user must possess CAP_SYS_NICE to change the scheduling attributes of a process. Any user can retrieve the scheduling information.  

NOTES

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.  

SEE ALSO

taskset(1), nice(1), renice(1)

See sched_setscheduler(2) for a description of the Linux scheduling scheme.  

AUTHOR

Written by Robert M. Love.  

COPYRIGHT

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.  

AVAILABILITY

The chrt command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
USAGE
PERMISSIONS
NOTES
SEE ALSO
AUTHOR
COPYRIGHT
AVAILABILITY


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