forked from pool/util-linux
137 lines
4.2 KiB
Groff
137 lines
4.2 KiB
Groff
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)renice.8 8.1 (Berkeley) 6/9/93
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.\"
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.Dd June 9, 1993
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.Dt RENICE 8
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.Os BSD 4
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.Sh NAME
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.Nm renice
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.Nd alter priority of running processes
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.Sh SYNOPSIS
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.Nm renice
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.Ar priority
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.Oo
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.Op Fl p
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.Ar pid ...
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.Oc
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.Oo
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.Op Fl g
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.Ar pgrp ...
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.Oc
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.Oo
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.Op Fl u
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.Ar user ...
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.Oc
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.Sh DESCRIPTION
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.Nm Renice
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alters the
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scheduling priority of one or more running processes.
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The following
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.Ar who
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parameters are interpreted as process ID's, process group
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ID's, or user names.
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.Nm Renice Ns 'ing
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a process group causes all processes in the process group
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to have their scheduling priority altered.
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.Nm Renice Ns 'ing
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a user causes all processes owned by the user to have
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their scheduling priority altered.
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By default, the processes to be affected are specified by
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their process ID's.
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.Pp
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Options supported by
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.Nm renice :
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.Bl -tag -width Ds
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.It Fl g
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Force
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.Ar who
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parameters to be interpreted as process group ID's.
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.It Fl u
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Force the
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.Ar who
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parameters to be interpreted as user names.
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.It Fl p
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Resets the
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.Ar who
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interpretation to be (the default) process ID's.
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.El
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.Pp
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For example,
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.Bd -literal -offset
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renice +1 987 -u daemon root -p 32
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.Ed
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.Pp
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would change the priority of process ID's 987 and 32, and
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all processes owned by users daemon and root.
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.Pp
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Users other than the super-user may only alter the priority of
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processes they own,
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and can only monotonically increase their ``nice value''
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within the range 0 to
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.Dv PRIO_MAX
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(20).
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(This prevents overriding administrative fiats.)
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The super-user
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may alter the priority of any process
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and set the priority to any value in the range
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.Dv PRIO_MIN
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(\-20)
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to
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.Dv PRIO_MAX .
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Useful priorities are:
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20 (the affected processes will run only when nothing else
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in the system wants to),
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0 (the ``base'' scheduling priority),
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anything negative (to make things go very fast).
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.Sh FILES
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.Bl -tag -width /etc/passwd -compact
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.It Pa /etc/passwd
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to map user names to user ID's
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.El
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.Sh SEE ALSO
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.Xr getpriority 2 ,
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.Xr setpriority 2
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.Sh BUGS
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Non super-users can not increase scheduling priorities of their own processes,
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even if they were the ones that decreased the priorities in the first place.
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.br
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The Linux kernel (at least version 2.0.0) and linux libc (at least
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version 5.2.18) does not agree entirely on what the specifics of the
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systemcall interface to set nice values is. Thus causes renice to
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report bogus previous nice values.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.0 .
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