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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 (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.

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