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.\" $OpenBSD: renice.8,v 1.14 2003/06/03 02:56:15 millert Exp $
.\"
.\" 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. 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.
.\"
.\" from: @(#)renice.8 8.1 (Berkeley) 6/9/93
.\"
.Dd June 9, 1993
.Dt RENICE 8
.Os
.Sh NAME
.Nm renice
.Nd alter priority of running processes
.Sh SYNOPSIS
.Nm renice
.Ar priority
.Oo
.Op Fl p
.Ar pid ...
.Oc
.Oo
.Op Fl g
.Ar pgrp ...
.Oc
.Oo
.Op Fl u
.Ar user ...
.Oc
.Sh DESCRIPTION
.Nm
alters the scheduling
.Ar priority
(an integer) of one or more running processes.
The following
.Ar who
parameters (pid, pgrp and user) are interpreted as process IDs, process group
IDs, or user names.
.Nm renice Ns ing
a process group causes all processes in the process group
to have their scheduling priority altered.
.Nm renice Ns ing
a user causes all processes owned by the user to have
their scheduling priority altered.
By default, the processes to be affected are specified by
their process IDs.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl g
Force
.Ar who
parameters to be interpreted as process group IDs.
.It Fl u
Force the
.Ar who
parameters to be interpreted as user names.
.It Fl p
Resets the
.Ar who
interpretation to be (the default) process IDs.
.El
.Pp
For example,
.Bd -literal -offset
# renice +1 987 -u daemon root -p 32
.Ed
.Pp
would change the priority of process IDs 987 and 32, and
all processes owned by users daemon and root.
.Pp
Users other than the superuser may only alter the priority of
processes they own,
and can only monotonically increase their
.Dq nice value
within the range 0 to
.Dv PRIO_MAX
(20).
(This prevents overriding administrative fiats.)
The superuser
may alter the priority of any process
and set the priority to any value in the range
.Dv PRIO_MIN
(\-20)
to
.Dv PRIO_MAX .
Useful priorities are:
20 (the affected processes will run only when nothing else
in the system wants to),
0 (the
.Dq base
scheduling priority),
anything negative (to make things go very fast).
.Sh FILES
.Bl -tag -width /etc/passwd -compact
.It Pa /etc/passwd
for mapping user names to user IDs
.El
.Sh SEE ALSO
.Xr nice 1 ,
.Xr getpriority 2 ,
.Xr setpriority 2
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.0 .
.Sh BUGS
Non-superusers cannot increase scheduling priorities of their own processes,
even if they were the ones that decreased the priorities in the first place.
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