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
NetBSD5.0.