manpagez: man (manual) pages & more
man renice(8)
Home | html | info | man
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 ...]
     renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]


DESCRIPTION

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

     The following options are available:

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

     -n      Instead of changing the specified processes to the given prior-
             ity, interpret the following argument as an increment to be
             applied to the current priority of each process.

     -u      Force the who parameters to be interpreted as user names or user
             ID's.

     -p      Reset 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 at the lowest prior-
     ity), 0 (the ``base'' scheduling priority), anything negative (lower val-
     ues cause more favorable scheduling).


FILES

     /etc/passwd  to map user names to user ID's


SEE ALSO

     nice(1), getpriority(2), setpriority(2)


STANDARDS

     The renice utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').


HISTORY

     The renice utility appeared in 4.0BSD.


BUGS

     Non super-users cannot increase scheduling priorities of their own pro-
     cesses, even if they were the ones that decreased the priorities in the
     first place.

BSD                              June 9, 1993                              BSD

Mac OS X 10.8 - Generated Tue Sep 4 09:02:54 CDT 2012