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28 .\" @(#)renice.8 8.1 (Berkeley) 6/9/93
36 .Nd alter priority of running processes
40 .Op Oo Fl gpu Oc Ar target
43 .Op Oo Fl gpu Oc Ar target
48 scheduling priority of one or more running processes.
51 parameters are interpreted as process ID's (the default), process group
52 ID's, user ID's or user names.
55 of a process group causes all processes in the process group
56 to have their scheduling priority altered.
59 of a user causes all processes owned by the user to have
60 their scheduling priority altered.
62 The following options are available:
63 .Bl -tag -width indent
65 Instead of changing the specified processes to the given priority,
66 interpret the following argument as an increment to be applied to
67 the current priority of each process.
71 parameters as process group ID's.
75 parameters as process ID's (the default).
79 parameters as user names or user ID's.
82 Users other than the super-user may only alter the priority of
84 and can only monotonically increase their ``nice value''
88 (This prevents overriding administrative fiats.)
90 may alter the priority of any process
91 and set the priority to any value in the range
96 Useful priorities are:
97 20 (the affected processes will run only when nothing else
98 in the system wants to),
99 0 (the ``base'' scheduling priority),
100 anything negative (to make things go very fast).
102 .Bl -tag -width /etc/passwd -compact
104 to map user names to user ID's
107 Change the priority of process ID's 987 and 32, and
108 all processes owned by users daemon and root.
110 .Dl "renice +1 987 -u daemon root -p 32"
127 Non super-users cannot increase scheduling priorities of their own processes,
128 even if they were the ones that decreased the priorities in the first place.