chrt man page on aLinux

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CHRT(1)			      Linux User's Manual		       CHRT(1)

NAME
       chrt - manipulate real-time attributes of a process

SYNOPSIS
       chrt [options] prio 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 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.

OPTIONS
       -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

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 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.

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/.

schedutils			   Apr 2003			       CHRT(1)
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