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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, or SCHED_BATCH) and priority
       can be set and retrieved.

       The 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 SCHED_BATCH

       -f, --fifo
              set scheduling policy to SCHED_FIFO

       -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.

AUTHOR
       Written by Robert M. Love.

COPYRIGHT
       Copyright (C) 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)