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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
   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

   -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.

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

   -h, --help
          Display help text 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''
   scheduling priority), anything negative (to make things go very fast).

FILES

   /etc/passwd
          to map user names to user IDs

SEE ALSO

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

BUGS

   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

   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/.



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