sys-utils/renice.1

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  32 .\"     @(#)renice.8    8.1 (Berkeley) 6/9/93
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  34 .TH RENICE "1" "July 2014" "util-linux" "User Commands"
  35 .SH NAME
  36 renice \- alter priority of running processes
  37 .SH SYNOPSIS
  38 .B renice
  39 .RB [ \-n ]
  40 .I priority
  41 .RB [ \-g | \-p | \-u ]
  42 .IR identifier ...
  43 .SH DESCRIPTION
  44 .B renice
  45 alters the scheduling priority of one or more running processes.  The
  46 first argument is the \fIpriority\fR value to be used.
  47 The other arguments are interpreted as process IDs (by default),
  48 process group IDs, user IDs, or user names.
  49 .BR renice 'ing
  50 a process group causes all processes in the process group to have their
  51 scheduling priority altered.
  52 .BR renice 'ing
  53 a user causes all processes owned by the user to have their scheduling
  54 priority altered.
  55 .PP
  56 .SH OPTIONS
  57 .TP
  58 .BR \-n , " \-\-priority " \fIpriority\fR
  59 Specify the scheduling
  60 .I priority
  61 to be used for the process, process group, or user.  Use of the option
  62 .BR \-n " or " \-\-priority
  63 is optional, but when used it must be the first argument.
  64 .TP
  65 .BR \-g , " \-\-pgrp
  66 Interpret the succeeding arguments as process group IDs.
  67 .TP
  68 .BR \-p , " \-\-pid
  69 Interpret the succeeding arguments as process IDs
  70 (the default).
  71 .TP
  72 .BR \-u , " \-\-user
  73 Interpret the succeeding arguments as usernames or UIDs.
  74 .TP
  75 .BR \-V , " \-\-version"
  76 Display version information and exit.
  77 .TP
  78 .BR \-h , " \-\-help"
  79 Display help text and exit.
  80 .SH FILES
  81 .TP
  82 .I /etc/passwd
  83 to map user names to user IDs
  84 .SH NOTES
  85 Users other than the superuser may only alter the priority of processes they
  86 own.  Furthermore, an unprivileged user can only
  87 .I increase
  88 the ``nice value'' (i.e., choose a lower priority)
  89 and such changes are irreversible unless (since Linux 2.6.12)
  90 the user has a suitable ``nice'' resource limit (see
  91 .BR ulimit (1p)
  92 and
  93 .BR getrlimit (2)).
  94
  95 The superuser may alter the priority of any process and set the priority to any
  96 value in the range \-20 to 19.
  97 Useful priorities are: 19 (the affected processes will run only when nothing
  98 else in the system wants to), 0 (the ``base'' scheduling priority), anything
  99 negative (to make things go very fast).
 100 .SH HISTORY
 101 The
 102 .B renice
 103 command appeared in 4.0BSD.
 104 .SH EXAMPLE
 105 The following command would change the priority of the processes with
 106 PIDs 987 and 32, plus all processes owned by the users daemon and root:
 107 .TP
 108 .B "       renice" +1 987 \-u daemon root \-p 32
 109 .SH SEE ALSO
 110 .BR nice (1),
 111 .BR chrt (1),
 112 .BR getpriority (2),
 113 .BR setpriority (2),
 114 .BR credentials (7),
 115 .BR sched (7)
 116 .SH AVAILABILITY
 117 The renice command is part of the util-linux package and is available from
 118 .UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
 119 Linux Kernel Archive
 120 .UE .