NAME
renice —
alter priority of running
processes
SYNOPSIS
renice |
priority
[[-p]
pid ...]
[-g pgrp
...] [-u
user ...] |
renice |
-n increment
[[-p]
pid ...]
[-g pgrp
...] [-u
user ...] |
DESCRIPTION
renice alters the scheduling priority of one or more running
processes. The following
who parameters are interpreted
as process ID's, process group ID's, or user names.
renice'ing a process group causes all processes in the
process group to have their scheduling priority altered.
renice'ing a user causes all processes owned by the user to
have their scheduling priority altered. By default, the processes to be
affected are specified by their process ID's.
Options supported by
renice:
-
-
- -g
- Force who parameters to be
interpreted as process group ID's.
-
-
- -n
- Instead of changing the specified processes to the given
priority, interpret the following argument as an increment to be applied
to the current priority of each process.
-
-
- -u
- Force the who parameters to be
interpreted as user names.
-
-
- -p
- Resets the who interpretation to be
(the default) process ID's.
For example,
renice +1 987 -u daemon root -p 32
would change the priority of process ID's 987 and 32, and all processes owned by
users daemon and root.
Users other than the super-user may only alter the priority of processes they
own, and can only monotonically increase their ``nice value'' within the range
0 to
PRIO_MAX
(20). (This prevents overriding
administrative fiats.) The super-user may alter the priority of any process
and set the priority to any value in the range
PRIO_MIN
(-20) to
PRIO_MAX
.
Useful priorities are: 0, the ``base'' scheduling priority; 20, the affected
processes will run only when nothing at the base priority wants to; anything
negative, the processes will receive a scheduling preference.
FILES
- /etc/passwd
- to map user names to user ID's
SEE ALSO
nice(1),
prenice(1),
getpriority(2),
setpriority(2)
HISTORY
The
renice command appeared in
4.0BSD.
BUGS
Non super-users can not increase scheduling priorities of their own processes,
even if they were the ones that decreased the priorities in the first
place.