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Dd March 21, 2011
Dt SCHEDCTL 8
Os
Sh NAME
Nm schedctl
Nd control scheduling of processes and threads
Sh SYNOPSIS
Nm
Op Fl A Ar cpus
Op Fl C Ar class
Op Fl P Ar pri
Op Fl t Ar lid
Fl p Ar pid | Ar command
Sh DESCRIPTION
The
Nm
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.
Nm
can also be used to start a new command using the specified parameters.
Pp
Available options:
Bl -tag -width "-C class "
It Fl A Ar 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.
It Fl C Ar class
Scheduling class (policy), one of:
Bl -tag -width SCHEDOTHERXX
It Dv SCHED_OTHER
Time-sharing (TS) scheduling policy.
The default policy in
Nx .
It Dv SCHED_FIFO
First in, first out (FIFO) scheduling policy.
It Dv SCHED_RR
Round-robin scheduling policy.
El
It Fl P Ar pri
Priority for the process or thread.
Value should be in the range from
Dv SCHED_PRI_MIN
(0) to
Dv SCHED_PRI_MAX
(63).
Setting of priority for the process or thread running at
Dv SCHED_OTHER
policy is not allowed.
It 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.
Pp
If
Fl p
is not given, a command to execute must be given on the command line.
It Fl t Ar lid
Thread in the specified process.
If specified, only this thread in the process will be affected.
May only be specified if
Fl p
is also given.
El
Sh EXAMPLES
Show scheduling information about the process whose ID is
Dq 123 :
Bd -literal -offset indent
# schedctl -p 123
Ed
Pp
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 :
Bd -literal -offset indent
# schedctl -p 123 -t 1 -A 0,1 -C SCHED_RR -P 63
Ed
Pp
Run the
Xr top 1
command with real-time priority:
Bd -literal -offset indent
# schedctl -C SCHED_FIFO top
Ed
Sh SEE ALSO
Xr nice 1 ,
Xr getpriority 2 ,
Xr setpriority 2 ,
Xr psrset 8 ,
Xr renice 8
Sh HISTORY
The
Nm
command first appeared in
Nx 5.0 .
