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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd October 27, 2020 29.Dt RENICE 8 30.Os 31.Sh NAME 32.Nm renice 33.Nd alter priority of running processes 34.Sh SYNOPSIS 35.Nm 36.Ar priority 37.Op Oo Fl gpu Oc Ar target 38.Nm 39.Fl n Ar increment 40.Op Oo Fl gpu Oc Ar target 41.Sh DESCRIPTION 42The 43.Nm 44utility alters the 45scheduling priority of one or more running processes. 46The following 47.Ar target 48parameters are interpreted as process ID's (the default), process group 49ID's, user ID's or user names. 50The 51.Nm Ns 'ing 52of a process group causes all processes in the process group 53to have their scheduling priority altered. 54The 55.Nm Ns 'ing 56of a user causes all processes owned by the user to have 57their scheduling priority altered. 58.Pp 59The following options are available: 60.Bl -tag -width indent 61.It Fl n 62Instead of changing the specified processes to the given priority, 63interpret the following argument as an increment to be applied to 64the current priority of each process. 65.It Fl g 66Interpret 67.Ar target 68parameters as process group ID's. 69.It Fl p 70Interpret 71.Ar target 72parameters as process ID's (the default). 73.It Fl u 74Interpret 75.Ar target 76parameters as user names or user ID's. 77.El 78.Pp 79Users other than the super-user may only alter the priority of 80processes they own, 81and can only monotonically increase their ``nice value'' 82within the range 0 to 83.Dv PRIO_MAX 84(20). 85(This prevents overriding administrative fiats.) 86The super-user 87may alter the priority of any process 88and set the priority to any value in the range 89.Dv PRIO_MIN 90(\-20) 91to 92.Dv PRIO_MAX . 93Useful priorities are: 9420 (the affected processes will run only when nothing else 95in the system wants to), 960 (the ``base'' scheduling priority), 97anything negative (to make things go very fast). 98.Sh FILES 99.Bl -tag -width /etc/passwd -compact 100.It Pa /etc/passwd 101to map user names to user ID's 102.El 103.Sh EXAMPLES 104Change the priority of process ID's 987 and 32, and 105all processes owned by users daemon and root. 106.Pp 107.Dl "renice +1 987 -u daemon root -p 32" 108.Sh SEE ALSO 109.Xr nice 1 , 110.Xr rtprio 1 , 111.Xr getpriority 2 , 112.Xr setpriority 2 113.Sh STANDARDS 114The 115.Nm 116utility conforms to 117.St -p1003.1-2001 . 118.Sh HISTORY 119The 120.Nm 121utility appeared in 122.Bx 4.0 . 123.Sh BUGS 124Non super-users cannot increase scheduling priorities of their own processes, 125even if they were the ones that decreased the priorities in the first place. 126