RENICE(8) UNIX Programmer's Manual RENICE(8) NNAAMMEE renice - alter priority of running processes SSYYNNOOPPSSIISS //eettcc//rreenniiccee priority [ [ --pp ] pid ... ] [ [ --gg ] pgrp ... ] [ [ --uu ] user ... ] DDEESSCCRRIIPPTTIIOONN _R_e_n_i_c_e alters the scheduling priority of one or more running processes. The _w_h_o parameters are interpreted as process ID's, process group ID's, or user names. _R_e_n_i_c_e'ing a pro- cess group causes all processes in the process group to have their scheduling priority altered. _R_e_n_i_c_e'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. To force _w_h_o parame- ters to be interpreted as process group ID's, a --gg may be specified. To force the _w_h_o parameters to be interpreted as user names, a --uu may be given. Supplying --pp will reset _w_h_o interpretation to be (the default) process ID's. For exam- ple, /etc/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 only when nothing else in the system wants to), 0 (the ``base'' scheduling priority), anything negative (to make things go very fast). FFIILLEESS /etc/passwd to map user names to user ID's SSEEEE AALLSSOO getpriority(2), setpriority(2) BBUUGGSS Non super-users can not increase scheduling priorities of their own processes, even if they were the ones that decreased the priorities in the first place. Printed 7/9/88 May 19, 1986 1