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手册页第 1 部分:用户命令     Oracle Solaris 11.1 Information Library (简体中文)
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renice

- alter priority of running processes

用法概要

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]...

描述

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 of priorities (-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 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),; and any negative value (to make things go very fast). 20 is an acceptable nice value, but will be rounded down to 19.

选项

renice supports the following option features:

The following options are supported:

-g

Interprets all operands or just the gid arguments as unsigned decimal integer process group IDs.

-i

This option, together with the ID list arguments, specifies a class of processes to which the renice command is to apply. The interpretation of the ID list depends on the value of idtype. The valid idtype arguments are: pid, pgid, uid, gid, sid, taskid, projid, and zoneid.

-n increment

Specifies how the system scheduling priority of the specified process or processes is to be 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 process 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 operand represents an unsigned decimal integer, it will be used as the numeric user ID of the user.

操作数

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 system 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.

示例

示例 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

示例 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

示例 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:

example% renice -n 4 -u 8 sas

环境变量

See environ(5) for descriptions of the following environment variables that affect the execution of renice: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.

退出状态

The following exit values are returned:

0

Successful completion.

>0

An error occurred.

文件

/etc/passwd

map user names to user IDs

属性

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
system/core-os
Interface Stability
Committed
Standard

另请参见

nice(1), passwd(1), priocntl(1), attributes(5), environ(5), standards(5)

附注

The renice syntax

renice [-n increment] [-i idtype] ID ...

is preferred over the old syntax

renice [-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.