User Commands renice(1)
NAME
renice - alter priority of running processes
SYNOPSIS
renice [-n increment] [-i idtype] ID...
renice [-n increment] [-g | -p | -u] ID...
renice priority [-p] pid... [-g gid]... [-p pid]...
[-u user]...
renice priority -g gid... [-g gid]... [-p pid]...
[-u user]...
renice priority -u user... [-g gid]... [-p pid]...
[-u user]...
DESCRIPTION
The renice command alters the scheduling priority of one or
more running processes. By default, the processes to be affected are specified by their process IDs. If the first operand is a number within the valid range ofpriorities (-20 to 20), renice will treat it as a priority
(as in all but the first synopsis form). Otherwise, renice
will treat it as an ID (as in the first synopsis form). Altering Process Priority Users other than the privileged user may only alter the priority of processes they own, and can only monotonically increase their "nice value" within the range 0 to 19. This prevents overriding administrative fiats. The privileged user may alter the priority of any process and set thepriority to any value in the range -20 to 19. Useful priori-
ties are: 19 (the affected processes will run only whennothing else in the system wants to); 0 (the "base" schedul-
ing priority),; and any negative value (to make things go very fast). 20 is an acceptable nice value, but will be rounded down to 19. OPTIONSrenice supports the following option features:
o The first operand, priority, must precede theoptions and can have the appearance of a multi-
digit option.SunOS 5.11 Last change: 9 Jan 2004 1
User Commands renice(1)
o The -g, -p, and -u options can each take multiple
option-arguments.
o The pid option-argument can be used without its -p
option.o The -i option can be used to specify the ID type
for the ID list. This is preferred in specifying IDtype over the use of the -g | -p | -u syntax, which
is now obsolete. See NOTES. The following options are supported:-g Interprets all operands or just the gid
arguments as unsigned decimal integer pro-
cess group IDs.-i This option, together with the ID list argu-
ments, specifies a class of processes towhich the renice command is to apply. The
interpretation of the ID list depends on the value of idtype. The valid idtype argumentsare: pid, pgid, uid, gid, sid, taskid, pro-
jid, and zoneid.-n increment Specifies how the system scheduling priority
of the specified process or processes is tobe adjusted. The increment option-argument
is a positive or negative decimal integer that will be used to modify the system scheduling priority of the specified process or processes. Positive increment values cause a lower system scheduling priority. Negative increment values may require appropriate privileges and will cause a higher system scheduling priority.-p Interprets all operands or just the pid
arguments as unsigned decimal integer pro-
cess IDs. The -p option is the default if no
options are specified.-u Interprets all operands or just the user
argument as users. If a user exists with a user name equal to the operand, then the user ID of that user will be used in further processing. Otherwise, if the operandSunOS 5.11 Last change: 9 Jan 2004 2
User Commands renice(1)
represents an unsigned decimal integer, it will be used as the numeric user ID of the user. OPERANDS The following operands are supported: ID A process ID, process group ID, or user name/user ID, depending on the option selected.priority The value specified is taken as the actual sys-
tem scheduling priority, rather than as an increment to the existing system scheduling priority. Specifying a scheduling priority higher than that of the existing process may require appropriate privileges.EXAMPLES
Example 1 Adjusting the scheduling priority of process IDs Adjust the system scheduling priority so that process IDs 987 and 32 would have a lower scheduling priority:example% renice -n 5 -p 987 32
Example 2 Adjusting the scheduling priority of group IDs Adjust the system scheduling priority so that group IDs 324 and 76 would have a higher scheduling priority, if the user has the appropriate privileges to do so:example% renice -n -4 -g 324 76
Example 3 Adjusting the scheduling priority of a user ID and user name Adjust the system scheduling priority so that numeric user ID 8 and user sas would have a lower scheduling priority:SunOS 5.11 Last change: 9 Jan 2004 3
User Commands renice(1)
example% renice -n 4 -u 8 sas
ENVIRONMENT VARIABLES See environ(5) for descriptions of the following environmentvariables that affect the execution of renice: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
EXIT STATUS The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES /etc/passwd map user names to user IDsATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcs ||_____________________________|_____________________________|
| Interface Stability | Committed ||_____________________________|_____________________________|
| Standard | See standards(5). ||_____________________________|_____________________________|
SEE ALSO
nice(1), passwd(1), priocntl(1), attributes(5), environ(5), standards(5) NOTESThe renice syntax
renice [-n increment] [-i idtype] ID ...
SunOS 5.11 Last change: 9 Jan 2004 4
User Commands renice(1)
is preferred over the old syntaxrenice [-n increment] [-g | -p| -u] ID ...
which is now obsolete. If you make the priority very negative, then the process cannot be interrupted. To regain control you must make the priority greater than 0. Users other than the privileged user cannot increase scheduling priorities of their own processes, even if they were the ones that decreased the priorities in the first place.The priocntl command subsumes the function of renice.
SunOS 5.11 Last change: 9 Jan 2004 5