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
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/.