1.\" $NetBSD: renice.8,v 1.15 2012/12/06 07:52:12 wiz Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" from: @(#)renice.8 8.1 (Berkeley) 6/9/93 31.\" 32.Dd December 6, 2012 33.Dt RENICE 8 34.Os 35.Sh NAME 36.Nm renice 37.Nd alter priority of running processes 38.Sh SYNOPSIS 39.Nm 40.Ar priority 41.Oo 42.Op Fl p 43.Ar pid ... 44.Oc 45.Oo 46.Fl g 47.Ar pgrp ... 48.Oc 49.Oo 50.Fl u 51.Ar user ... 52.Oc 53.Nm 54.Fl n 55.Ar increment 56.Oo 57.Op Fl p 58.Ar pid ... 59.Oc 60.Oo 61.Fl g 62.Ar pgrp ... 63.Oc 64.Oo 65.Fl u 66.Ar user ... 67.Oc 68.Sh DESCRIPTION 69.Nm 70alters the 71scheduling priority of one or more running processes. 72The following 73.Ar who 74parameters are interpreted as process ID's, process group 75ID's, or user names. 76.Nm Ns 'ing 77a process group causes all processes in the process group 78to have their scheduling priority altered. 79.Nm Ns 'ing 80a user causes all processes owned by the user to have 81their scheduling priority altered. 82By default, the processes to be affected are specified by 83their process ID's. 84.Pp 85Options supported by 86.Nm : 87.Bl -tag -width Ds 88.It Fl g 89Force 90.Ar who 91parameters to be interpreted as process group ID's. 92.It Fl n 93Instead of changing the specified processes to the given priority, 94interpret the following argument as an increment to be applied to 95the current priority of each process. 96.It Fl u 97Force the 98.Ar who 99parameters to be interpreted as user names. 100.It Fl p 101Resets the 102.Ar who 103interpretation to be (the default) process ID's. 104.El 105.Pp 106For example, 107.Bd -literal -offset indent 108renice +1 987 -u daemon root -p 32 109.Ed 110.Pp 111would change the priority of process ID's 987 and 32, and 112all processes owned by users daemon and root. 113.Pp 114Users other than the super-user may only alter the priority of 115processes they own, 116and can only monotonically increase their ``nice value'' 117within the range 0 to 118.Dv PRIO_MAX 119(20). 120(This prevents overriding administrative fiats.) 121The super-user 122may alter the priority of any process 123and set the priority to any value in the range 124.Dv PRIO_MIN 125(\-20) 126to 127.Dv PRIO_MAX . 128.Pp 129Useful priorities are: 1300, the ``base'' scheduling priority; 13120, the affected processes will run only when nothing at the base priority 132wants to; 133anything negative, the processes will receive a scheduling preference. 134.Sh FILES 135.Bl -tag -width /etc/passwd -compact 136.It Pa /etc/passwd 137to map user names to user ID's 138.El 139.Sh SEE ALSO 140.Xr nice 1 , 141.Xr prenice 1 , 142.Xr getpriority 2 , 143.Xr setpriority 2 144.Sh HISTORY 145The 146.Nm 147command appeared in 148.Bx 4.0 . 149.Sh BUGS 150Non super-users can not increase scheduling priorities of their own processes, 151even if they were the ones that decreased the priorities in the first place. 152