RENICE(1)                       User Commands                      RENICE(1)

NAME         top

       renice - alter priority of running processes

SYNOPSIS         top

       renice [-n] priority [-g|-p|-u] identifier...

DESCRIPTION         top

       renice alters the scheduling priority of one or more running
       processes.  The first argument is the priority value to be used.  The
       other arguments are interpreted as process IDs (by default), process
       group IDs, user IDs, 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.

OPTIONS         top

       -n, --priority priority
              Specify the scheduling priority to be used for the process,
              process group, or user.  Use of the option -n or --priority is
              optional, but when used it must be the first argument.

       -g, --pgrp
              Interpret the succeeding arguments as process group IDs.

       -p, --pid
              Interpret the succeeding arguments as process IDs (the

       -u, --user
              Interpret the succeeding arguments as usernames or UIDs.

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

EXAMPLES         top

       The following command would change the priority of the processes with
       PIDs 987 and 32, plus all processes owned by the users daemon and

              renice +1 987 -u daemon root -p 32

NOTES         top

       Users other than the superuser may only alter the priority of
       processes they own, and can only monotonically increase their ``nice
       value'' (for security reasons) within the range 0 to 19, unless a
       nice resource limit is set (Linux 2.6.12 and higher).  The superuser
       may alter the priority of any process and set the priority to any
       value in the range -20 to 19.  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         top

              to map user names to user IDs

SEE ALSO         top

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

BUGS         top

       Non-superusers cannot 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 entirely on what the specifics of the
       systemcall interface to set nice values is.  Thus causes renice to
       report bogus previous nice values.

HISTORY         top

       The renice command appeared in 4.0BSD.

AVAILABILITY         top

       The renice command is part of the util-linux package and is available
       from Linux Kernel Archive 

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
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util-linux                        July 2014                        RENICE(1)