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renice - alter priority of running processes


renice -n priority [options] <pid> [...]


Renice alters the scheduling priority of one or more running processes. The following who parameters are inter-preted 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 specified by their process ID's.


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'' (for security reasons) within the range 0 to PRIO_MAX (20), unless a nice resource limit is set (Linux 2.6.12 and higher).

The super-user may alter the priority of any process and set the prior‐ity to any value in the range PRIO_MIN (-20) to PRIO_MAX.

Useful priorities are:

20 (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)

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Page last modified on February 18, 2013, at 07:29 AM