renice/renice.8

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  33 .\"
  34 .\"     from: @(#)renice.8      8.1 (Berkeley) 6/9/93
  35 .\"     $NetBSD: renice.8,v 1.5 1997/10/19 14:01:33 lukem Exp $
  36 .\"
  37 .Dd June 9, 1993
  38 .Dt RENICE 8
  39 .Os BSD 4
  40 .Sh NAME
  41 .Nm renice
  42 .Nd alter priority of running processes
  43 .Sh SYNOPSIS
  44 .Nm
  45 .Ar priority
  46 .Oo
  47 .Op Fl p
  48 .Ar pid ...
  49 .Oc
  50 .Oo
  51 .Op Fl g
  52 .Ar pgrp ...
  53 .Oc
  54 .Oo
  55 .Op Fl u
  56 .Ar user ...
  57 .Oc
  58 .Sh DESCRIPTION
  59 .Nm
  60 alters the
  61 scheduling priority of one or more running processes.
  62 The following
  63 .Ar who
  64 parameters are interpreted as process ID's, process group
  65 ID's, or user names.
  66 .Nm "" Ns 'ing
  67 a process group causes all processes in the process group
  68 to have their scheduling priority altered.
  69 .Nm "" Ns 'ing
  70 a user causes all processes owned by the user to have
  71 their scheduling priority altered.
  72 By default, the processes to be affected are specified by
  73 their process ID's.
  74 .Pp
  75 Options supported by
  76 .Nm "" :
  77 .Bl -tag -width Ds
  78 .It Fl g
  79 Force
  80 .Ar who
  81 parameters to be interpreted as process group ID's.
  82 .It Fl u
  83 Force the
  84 .Ar who
  85 parameters to be interpreted as user names.
  86 .It Fl p
  87 Resets the
  88 .Ar who
  89 interpretation to be (the default) process ID's.
  90 .El
  91 .Pp
  92 For example,
  93 .Bd -literal -offset
  94 renice +1 987 -u daemon root -p 32
  95 .Ed
  96 .Pp
  97 would change the priority of process ID's 987 and 32, and
  98 all processes owned by users daemon and root.
  99 .Pp
 100 Users other than the super-user may only alter the priority of
 101 processes they own,
 102 and can only monotonically increase their ``nice value''
 103 within the range 0 to
 104 .Dv PRIO_MAX
 105 (20).
 106 (This prevents overriding administrative fiats.)
 107 The super-user
 108 may alter the priority of any process
 109 and set the priority to any value in the range
 110 .Dv PRIO_MIN
 111 (\-20)
 112 to
 113 .Dv PRIO_MAX .
 114 Useful priorities are:
 115 20 (the affected processes will run only when nothing else
 116 in the system wants to),
 117 0 (the ``base'' scheduling priority),
 118 anything negative (to make things go very fast).
 119 .Sh FILES
 120 .Bl -tag -width /etc/passwd -compact
 121 .It Pa /etc/passwd
 122 to map user names to user ID's
 123 .El
 124 .Sh SEE ALSO
 125 .Xr nice 1 ,
 126 .Xr getpriority 2 ,
 127 .Xr setpriority 2
 128 .Sh BUGS
 129 Non super-users can not increase scheduling priorities of their own processes,
 130 even if they were the ones that decreased the priorities in the first place.
 131 .Sh HISTORY
 132 The
 133 .Nm
 134 command appeared in
 135 .Bx 4.0 .