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chrt

NAME

chrt - manipulate real-time attributes of a process

SYNOPSIS

chrt [options]\prio R command  [ arg ]...
chrt [options] -p [prio]\pid

DESCRIPTION

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 R SCHED_OTHER , R SCHED_FIFO , R SCHED_RR , or R SCHED_BATCH ) and priority can be set and retrieved.
The R SCHED_BATCH policy is supported since Linux 2.6.16.

OPTIONS

-p, --pid
operate on an existing PID and do not launch a new task
-b, --batch
set scheduling policy to R SCHED_BATCH
-f, --fifo
set scheduling policy to R SCHED_FIFO
-m, --max
show minimum and maximum valid priorities, then exit
-o, --other
set policy scheduling policy to R SCHED_OTHER
-r, --rr
set scheduling policy to R SCHED_RR (the default)
-h, --help
display usage information and exit
-v, --version
output version information and exit

USAGE

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

PERMISSIONS

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

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.

SEE ALSO

taskset(1), nice(1), renice(1) See sched_setscheduler(2) for a description of the Linux scheduling scheme.

AVAILABILITY

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/.