1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)renice.8 8.1 (Berkeley) 6/9/93 33.\" $FreeBSD$ 34.\" 35.Dd June 9, 1993 36.Dt RENICE 8 37.Os 38.Sh NAME 39.Nm renice 40.Nd alter priority of running processes 41.Sh SYNOPSIS 42.Nm 43.Ar priority 44.Oo 45.Op Fl p 46.Ar pid ... 47.Oc 48.Oo 49.Op Fl g 50.Ar pgrp ... 51.Oc 52.Oo 53.Op Fl u 54.Ar user ... 55.Oc 56.Sh DESCRIPTION 57.Nm Renice 58alters the 59scheduling priority of one or more running processes. 60The following 61.Ar who 62parameters are interpreted as process ID's, process group 63ID's, or user names. 64.Nm Renice Ns 'ing 65a process group causes all processes in the process group 66to have their scheduling priority altered. 67.Nm Renice Ns 'ing 68a user causes all processes owned by the user to have 69their scheduling priority altered. 70By default, the processes to be affected are specified by 71their process ID's. 72.Pp 73Options supported by 74.Nm : 75.Bl -tag -width Ds 76.It Fl g 77Force 78.Ar who 79parameters to be interpreted as process group ID's. 80.It Fl u 81Force the 82.Ar who 83parameters to be interpreted as user names. 84.It Fl p 85Resets the 86.Ar who 87interpretation to be (the default) process ID's. 88.El 89.Pp 90For example, 91.Bd -literal -offset 92renice +1 987 -u daemon root -p 32 93.Ed 94.Pp 95would change the priority of process ID's 987 and 32, and 96all processes owned by users daemon and root. 97.Pp 98Users other than the super-user may only alter the priority of 99processes they own, 100and can only monotonically increase their ``nice value'' 101within the range 0 to 102.Dv PRIO_MAX 103(20). 104(This prevents overriding administrative fiats.) 105The super-user 106may alter the priority of any process 107and set the priority to any value in the range 108.Dv PRIO_MIN 109(\-20) 110to 111.Dv PRIO_MAX . 112Useful priorities are: 11320 (the affected processes will run only when nothing else 114in the system wants to), 1150 (the ``base'' scheduling priority), 116anything negative (to make things go very fast). 117.Sh FILES 118.Bl -tag -width /etc/passwd -compact 119.It Pa /etc/passwd 120to map user names to user ID's 121.El 122.Sh SEE ALSO 123.Xr nice 1 , 124.Xr rtprio 1 , 125.Xr getpriority 2 , 126.Xr setpriority 2 127.Sh BUGS 128Non super-users cannot increase scheduling priorities of their own processes, 129even if they were the ones that decreased the priorities in the first place. 130.Sh HISTORY 131The 132.Nm 133command appeared in 134.Bx 4.0 . 135