Provided by: util-linux_2.27.1-6ubuntu2_i386 bug

NAME
       chrt - manipulate the real-time attributes of a process


SYNOPSIS
       chrt [options] priority command [argument...]
       chrt [options] -p [priority] pid


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/.