renice - phpMan

RENICE(8)                 BSD System Manager’s Manual                RENICE(8)

NAME
     renice - alter priority of running processes

SYNOPSIS
     renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]

DESCRIPTION
     Renice alters the scheduling priority of one or more running processes.  The follow-
     ing who parameters are interpreted as process ID’s, process group ID’s, or user
     names.  Renice’ing a process group causes all processes in the process group to have
     their scheduling priority altered.  Renice’ing a user causes all processes owned by
     the user to have their scheduling priority altered.  By default, the processes to be
     affected are specified by their process ID’s.

     Options supported by renice:

     -g      Force who parameters to be interpreted as process group ID’s.

     -u      Force the who parameters to be interpreted as user names.

     -p      Resets the who interpretation to be (the default) process ID’s.

     For example,

     renice +1 987 -u daemon root -p 32

     would change the priority of process ID’s 987 and 32, and all processes owned by
     users daemon and root.

     Users other than the super-user may only alter the priority of processes they own,
     and can only monotonically increase their ‘‘nice value’’ within the range 0 to
     PRIO_MAX (20).  (This prevents overriding administrative fiats.)  The super-user may
     alter the priority of any process and set the priority to any value in the range
     PRIO_MIN (-20) to PRIO_MAX.  Useful priorities are: 20 (the affected processes will
     run only when nothing else in the system wants to), 0 (the ‘‘base’’ scheduling prior-
     ity), anything negative (to make things go very fast).

FILES
     /etc/passwd  to map user names to user ID’s

SEE ALSO
     getpriority(2), setpriority(2)

BUGS
     Non super-users can not increase scheduling priorities of their own processes, even
     if they were the ones that decreased the priorities in the first place.
     The Linux kernel (at least version 2.0.0) and linux libc (at least version 5.2.18)
     does not agree entierly on what the specifics of the systemcall interface to set nice
     values is.  Thus causes renice to report bogus previous nice values.

HISTORY
     The renice command appeared in 4.0BSD.

4th Berkeley Distribution        June 9, 1993        4th Berkeley Distribution

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