renice(1)



RENICE(1)                        User Commands                       RENICE(1)

NAME
       renice - alter priority of running processes

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

DESCRIPTION
       renice alters the scheduling priority of one or more running processes.
       The first argument is the priority value to be used.  The  other  argu-
       ments  are  interpreted as process IDs (by default), process group IDs,
       user IDs, or user names.  renice'ing a process group  causes  all  pro-
       cesses  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
       -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 default).

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

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

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

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

              renice +1 987 -u daemon root -p 32

NOTES
       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''  sched-
       uling priority), anything negative (to make things go very fast).

FILES
       /etc/passwd
              to map user names to user IDs

SEE ALSO
       getpriority(2), setpriority(2)

BUGS
       Non-superusers  cannot increase scheduling priorities of their own pro-
       cesses, 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 ver-
       sion 5.2.18) does not agree entirely on what the specifics of the  sys-
       temcall  interface to set nice values is.  Thus causes renice to report
       bogus previous nice values.

HISTORY
       The renice command appeared in 4.0BSD.

AVAILABILITY
       The renice command is part of the util-linux package and  is  available
       from  Linux  Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux                         July 2014                         RENICE(1)

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