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.Dd April 28, 2008 .Dt SCHEDCTL 8 .Os .Sh NAME .Nm schedctl .Nd control scheduling of processes and threads .Sh SYNOPSIS .Nm .Fl p Ar pid .Op Fl A Ar processors .Op Fl C Ar class .Op Fl P Ar priority .Op Fl t Ar lid .Sh DESCRIPTION The .Nm command can be used to control the scheduling of processes and threads. It also returns information about current scheduling parameters of the process or thread. Only the super-user may change the scheduling parameters.
p Available options: l -tag -width indent t Fl A Ar processors 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. t Fl C Ar class Scheduling class (policy) might be: l -tag -width SCHEDOTHERXX t Dv SCHED_OTHER Time-sharing (TS) scheduling policy. The default policy in .Nx . t Dv SCHED_FIFO First in, first out (FIFO) scheduling policy. t Dv SCHED_RR Round-robin scheduling policy. .El t Fl P Ar priority Priority which will be set for the process or thread. For all scheduling classes, priority might be set to any value in the range from .Dv SCHED_PRI_MIN (0) to .Dv SCHED_PRI_MAX (63). t Fl p Ar pid The target process which will be affected. If the process has more than one thread, all of them will be affected. t Fl t Ar lid Thread in the specified process. If specified, only this thread in the process will be affected. .El .Sh EXAMPLES Show scheduling information about the process whose ID is .Dq 123 : d -literal -offset indent # schedctl -p 123 .Ed
p Set the affinity to CPU 0 and CPU 1, policy to .Dv SCHED_RR , and priority to 63 for thread whose ID is .Dq 1 in process whose ID is .Dq 123 : d -literal -offset indent # schedctl -p 123 -t 1 -A 0,1 -C 2 -P 63 .Ed .Sh SEE ALSO .Xr nice 1 , .Xr getpriority 2 , .Xr setpriority 2 , .Xr renice 8 .Sh HISTORY The .Nm command first appeared in .Nx 5.0 .