chrt



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




NAME

       chrt - manipulate real-time attributes of a process


SYNOPSIS

       chrt [options] [prio] [pid | command [arg]...]


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_FIFO, SCHED_RR, or SCHED_OTHER) and priority can be set
       and retrieved.


OPTIONS

       -p, --pid
              operate on an existing PID and do not launch a new task



       -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.


REPORTING BUGS

       Report bugs to <rml@tech9.net>.


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.



schedutils                         Apr 2003                            CHRT(1)

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