Section (1) renice
renice — alter priority of running processes
−n] priority [
−u ] identifier...
alters the scheduling priority of one or more running
processes. The first argument is the
priority value to be used. The
other arguments are interpreted as process IDs (by default),
process group IDs, user IDs, or user names. renice_zsingle_quotesz_ing a process group
causes all processes in the process group to have their
scheduling priority altered. renice_zsingle_quotesz_ing a user causes
all processes owned by the user to have their scheduling
Specify the scheduling
priorityto be used for the process, process group, or user. Use of the option
−−priorityis optional, but when used it must be the first argument.
Interpret the succeeding arguments as process group IDs.
Interpret the succeeding arguments as process IDs (the default).
Interpret the succeeding arguments as usernames or UIDs.
Display version information and exit.
Display help text and exit.
The following command would change the priority of the processes with PIDs 987 and 32, plus all processes owned by the users daemon and root:
- renice +1 987 -u daemon root -p 32
Users other than the superuser may only alter the priority of processes they own. Furthermore, an unprivileged user can only increase the ``nice value_zsingle_quotesz__zsingle_quotesz_ (i.e., choose a lower priority) and such changes are irreversible unless (since Linux 2.6.12) the user has a suitable ``nice_zsingle_quotesz__zsingle_quotesz_ resource limit (see ulimit(1) and getrlimit(2)).
The superuser may alter the priority of any process and set the priority to any value in the range −20 to 19. Useful priorities are: 19 (the affected processes will run only when nothing else in the system wants to), 0 (the ``base_zsingle_quotesz__zsingle_quotesz_ scheduling priority), anything negative (to make things go very fast).
The renice command is part of the util-linux package and is available from Linux Kernel Archive
Copyright (c) 1983, 1991, 1993
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS_zsingle_quotesz__zsingle_quotesz_ AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
(#)renice.8 8.1 (Berkeley) 6/9/93