RENICE(8) System Manager's Manual RENICE(8)
renice - alter priority of running processes
/etc/renice priority [ [ -p ] pid ... ] [ [ -g ] pgrp ... ] [ [ -u ]
user ... ]
Renice alters the scheduling priority of one or more running processes.
The 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 speci-
fied by their process ID's. To force who parameters to be interpreted
as process group ID's, a -g may be specified. To force the who parame-
ters to be interpreted as user names, a -u may be given. Supplying -p
will reset who interpretation to be (the default) process ID's. For
/etc/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 pro-
cesses they own, and can only monotonically increase their ``nice
value'' within the range 0 to PRIO_MIN (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_MAX (-20)
to PRIO_MIN. Useful priorities are: 19 (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
If you make the priority very negative, then the process cannot be
interrupted. To regain control you make the priority greater than
zero. 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.
4th Berkeley Distribution 24 July 1983 RENICE(8)