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_OTHER, SCHED_FIFO, SCHED_RR, or SCHED_BATCH) and priority can be set and retrieved.

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.

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)