SCHEDCTL(8)             NetBSD 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 prior-
             ity 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.

NetBSD 5.1                     October 18, 2008                     NetBSD 5.1

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