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SCHEDCTL(8)		  BSD 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 (start‐
		ing 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.

BSD				March 21, 2011				   BSD

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