[unix-history] / usr / src / man / man8 / renice.8

.\" Copyright (c) 1980 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)renice.8	6.2 (Berkeley) 5/19/86
.\"
.TH RENICE 8 "May 19, 1986"
.UC 4
.SH NAME
renice \- alter priority of running processes
.SH SYNOPSIS
.B /etc/renice
priority [ [
.B \-p
] pid ... ] [ [
.B \-g
] pgrp ... ] [ [
.B \-u
] user ... ]
.SH DESCRIPTION
.I Renice
alters the 
scheduling priority of one or more running processes.
The
.I who
parameters are interpreted as process ID's, process group
ID's, or user names.
.IR Renice 'ing
a process group causes all processes in the process group
to have their scheduling priority altered.  
.IR 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.  To force 
.I who
parameters to be interpreted as process group ID's, a
.B \-g 
may be specified.  To force the
.I who
parameters to be interpreted as user names, a
.B \-u
may be given.  Supplying
.B \-p
will reset 
.I who
interpretation to be (the default) process ID's.
For example,
.sp
	/etc/renice +1 987 -u daemon root -p 32 
.sp
would change the priority of process ID's 987 and 32, and
all processes owned by users daemon and root.
.PP
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).
.SH FILES
/etc/passwd	to map user names to user ID's
.SH SEE ALSO
getpriority(2), setpriority(2)
.SH BUGS
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.
Commit	Line	Data
c229b29d KM	1	.\" Copyright (c) 1980 Regents of the University of California.
	2	.\" All rights reserved. The Berkeley software License Agreement
	3	.\" specifies the terms and conditions for redistribution.
	4	.\"
95f51977	5	.\" @(#)renice.8 6.2 (Berkeley) 5/19/86
c229b29d	6	.\"
95f51977	7	.TH RENICE 8 "May 19, 1986"
c229b29d KM	8	.UC 4
c229b29d KM	9	.SH NAME
8d36c088	10	renice \- alter priority of running processes
c229b29d KM	11	.SH SYNOPSIS
c229b29d KM	12	.B /etc/renice
8d36c088 KM	13	priority [ [
	14	.B \-p
	15	] pid ... ] [ [
	16	.B \-g
	17	] pgrp ... ] [ [
	18	.B \-u
	19	] user ... ]
c229b29d KM	20	.SH DESCRIPTION
c229b29d KM	21	.I Renice
8d36c088 KM	22	alters the
	23	scheduling priority of one or more running processes.
	24	The
	25	.I who
	26	parameters are interpreted as process ID's, process group
	27	ID's, or user names.
	28	.IR Renice 'ing
	29	a process group causes all processes in the process group
	30	to have their scheduling priority altered.
	31	.IR Renice 'ing
	32	a user causes all processes owned by the user to have
	33	their scheduling priority altered.
	34	By default, the processes to be affected are specified by
	35	their process ID's. To force
	36	.I who
	37	parameters to be interpreted as process group ID's, a
	38	.B \-g
	39	may be specified. To force the
	40	.I who
	41	parameters to be interpreted as user names, a
	42	.B \-u
	43	may be given. Supplying
	44	.B \-p
	45	will reset
	46	.I who
	47	interpretation to be (the default) process ID's.
	48	For example,
	49	.sp
	50	/etc/renice +1 987 -u daemon root -p 32
	51	.sp
	52	would change the priority of process ID's 987 and 32, and
	53	all processes owned by users daemon and root.
c229b29d	54	.PP
8d36c088 KM	55	Users other than the super-user may only alter the priority of
	56	processes they own,
	57	and can only monotonically increase their ``nice value''
2b0388bc	58	within the range 0 to PRIO_MAX (20).
8d36c088 KM	59	(This prevents overriding administrative fiats.)
	60	The super-user
	61	may alter the priority of any process
2b0388bc MK	62	and set the priority to any value in the range PRIO_MIN (\-20)
2b0388bc MK	63	to PRIO_MAX.
8d36c088	64	Useful priorities are:
2b0388bc	65	20 (the affected processes will run only when nothing else
8d36c088 KM	66	in the system wants to),
	67	0 (the ``base'' scheduling priority),
	68	anything negative (to make things go very fast).
c229b29d	69	.SH FILES
8d36c088	70	/etc/passwd to map user names to user ID's
c229b29d	71	.SH SEE ALSO
8d36c088	72	getpriority(2), setpriority(2)
c229b29d	73	.SH BUGS
8d36c088 KM	74	Non super-users can not increase scheduling priorities of their own processes,
8d36c088 KM	75	even if they were the ones that decreased the priorities in the first place.