renice [-n] priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]
renice -h | -v
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 pro-
cesses 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:
The scheduling priority of the process, process group, or user.
Force who parameters to be interpreted as process group ID's.
Force the who parameters to be interpreted as user names.
Resets the who interpretation to be (the default) process ID's.
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'' (for
security reasons) within the range 0 to PRIO_MAX (20), unless a nice
resource limit is set (Linux 2.6.12 and higher). 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: 20 (the
affected processes will run only when nothing else in the system wants
to), 0 (the ``base'' scheduling priority), anything negative (to make
things go very fast).
/etc/passwd to map user names to user ID's
The renice command is part of the util-linux package and is available
util-linux November 2010 util-linux
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