NAME
schedctl —
control scheduling of processes and
threads
SYNOPSIS
schedctl |
[-A cpus]
[-C class]
[-P pri]
[-t lid]
-p pid |
command |
DESCRIPTION
Theschedctl 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:
-Acpus- 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.
-Cclass- 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.
-Ppri- Priority for the process or thread. Value should be in the range from
SCHED_PRI_MIN(0) toSCHED_PRI_MAX(63). Setting of priority for the process or thread running atSCHED_OTHERpolicy is not allowed. -ppid- The target process which will be affected. If the process has more than
one thread, all of them will be affected.
If
-pis not given, a command to execute must be given on the command line. -tlid- Thread in the specified process. If specified, only this thread in the
process will be affected. May only be specified if
-pis 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.