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renice — alter priority of running processes
renice [−n] priority [−gpu] identifier...
renice
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'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.
−n,
−−priority prioritySpecify the scheduling priority to be used for
the process, process group, or user. Use of the option
−n or −−priority is optional, but
when used it must be the first argument.
−g,
−−pgrp pgid...Force the succeeding arguments to be interpreted as process group IDs.
−u,
−−user name_or_uid...Force the succeeding arguments to be interpreted as usernames or UIDs.
−p,
−−pid pid...Force the succeeding arguments to be interpreted as process IDs (the default).
−h,
−−helpDisplay help text and exit.
−V,
−−versionDisplay version information 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:
Users other than the superuser 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 superuser 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).
Non-superusers cannot increase scheduling priorities of their own processes, even if they were the ones that decreased the priorities in the first place.
The Linux kernel (at least version 2.0.0) and linux libc (at least version 5.2.18) does not agree entirely on what the specifics of the systemcall interface to set nice values is. Thus causes renice to report bogus previous nice values.
The renice command is part of the util-linux package and is available from Linux Kernel Archive
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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 are met: 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'' 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 SUCH DAMAGE. (#)renice.8 8.1 (Berkeley) 6/9/93 |