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Command: schedctl | Section: 8 | Source: NetBSD | File: schedctl.8
SCHEDCTL(8) FreeBSD System Manager's Manual SCHEDCTL(8)
NAME
schedctl - control scheduling of processes and threads
SYNOPSIS
schedctl [-A cpus] [-C class] [-P pri] [-t lid] -p pid | command
DESCRIPTION
The schedctl command can be used to control the scheduling of processes
and threads. It also returns information about the current scheduling
parameters of the process or thread. Only the super-user may change the
scheduling parameters. schedctl can also be used to start a new command
using the specified parameters.
Available options:
-A cpus Set of the processors on which process or thread should run,
that is, affinity. Processors are defined as numbers
(starting from zero) and separated by commas. A value of -1
is used to unset the affinity.
-C class Scheduling class (policy), one of:
SCHED_OTHER Time-sharing (TS) scheduling policy. The
default policy in NetBSD.
SCHED_FIFO First in, first out (FIFO) scheduling policy.
SCHED_RR Round-robin scheduling policy.
-P pri Priority for the process or thread. Value should be in the
range from SCHED_PRI_MIN (0) to SCHED_PRI_MAX (63). Setting
of priority for the process or thread running at SCHED_OTHER
policy is not allowed.
-p pid The target process which will be affected. If the process has
more than one thread, all of them will be affected.
If -p is not given, a command to execute must be given on the
command line.
-t lid Thread in the specified process. If specified, only this
thread in the process will be affected. May only be specified
if -p is also given.
EXAMPLES
Show scheduling information about the process whose ID is "123":
# schedctl -p 123
Set the affinity to CPU 0 and CPU 1, policy to SCHED_RR, and priority to
63 for thread whose ID is "1" in process whose ID is "123":
# schedctl -p 123 -t 1 -A 0,1 -C SCHED_RR -P 63
Run the top(1) command with real-time priority:
# schedctl -C SCHED_FIFO top
SEE ALSO
nice(1), getpriority(2), setpriority(2), psrset(8), renice(8)
HISTORY
The schedctl command first appeared in NetBSD 5.0.
FreeBSD 14.1-RELEASE-p8 March 21, 2011 FreeBSD 14.1-RELEASE-p8