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RENICE(8)                   System Manager's Manual                  RENICE(8)



NAME
       renice - alter priority of running processes

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

DESCRIPTION
       Renice alters the scheduling priority of one or more running processes.
       The 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 speci-
       fied by their process ID's.  To force who parameters to be  interpreted
       as process group ID's, a -g may be specified.  To force the who parame-
       ters to be interpreted as user names, a -u may be given.  Supplying  -p
       will  reset  who  interpretation to be (the default) process ID's.  For
       example,

            /etc/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 pro-
       cesses they own, and  can  only  monotonically  increase  their  ``nice
       value'' within the range 0 to PRIO_MIN (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_MAX (-20)
       to PRIO_MIN.  Useful priorities are: 19 (the  affected  processes  will
       run  only  when  nothing  else in the system wants to), 0 (the ``base''
       scheduling priority), 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
       If you make the priority very negative,  then  the  process  cannot  be
       interrupted.   To  regain  control  you  make the priority greater than
       zero.  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.



4th Berkeley Distribution        24 July 1983                        RENICE(8)