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{{manpage}} |
{{manpage}} |
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<pre> |
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renice(8) - Linux man page |
renice(8) - Linux man page |
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NAME |
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=== NAME === |
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renice - alter priority of running processes |
renice - alter priority of running processes |
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SYNOPSIS |
=== SYNOPSIS === |
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renice priority [[-p ] pid ... ] [[-g ] pgrp ... ] [[-u ] user ... ] |
renice priority [[-p ] pid ... ] [[-g ] pgrp ... ] [[-u ] user ... ] |
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DESCRIPTION |
=== DESCRIPTION === |
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Renice alters the scheduling priority of one or more running processes. |
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Renice alters the scheduling priority of one or more running processes. The following who parameters are interpreted 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. |
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⚫ | |||
group ID's, or user names. Renice'ing a process group causes all pro- |
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cesses in the process group to have their scheduling priority altered. |
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Renice'ing a user causes all processes owned by the user to have their |
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scheduling priority altered. By default, the processes to be affected |
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are specified by their process ID's. |
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Options supported by renice |
Options supported by renice: |
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⚫ | |||
-g |
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-u |
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-p |
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-u Force the who parameters to be interpreted as user names. |
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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). |
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⚫ | |||
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owned by users daemon and root. |
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Users other than the super-user may only alter the priority of processes |
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they own, and can only monotonically increase their ``nice value'' within |
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the range 0 to PRIO_MAX (20). (This prevents overriding administrative |
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fiats.) The super-user may alter the priority of any process and set the |
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priority to any value in the range PRIO_MIN (-20) to PRIO_MAX. Useful |
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priorities are: 20 (the affected processes will run only when nothing |
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else in the system wants to), 0 (the ``base'' scheduling priority), any- |
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thing negative (to make things go very fast). |
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⚫ | |||
/etc/passwd |
/etc/passwd |
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getpriority(2), setpriority(2) |
getpriority(2), setpriority(2) |
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BUGS |
=== BUGS === |
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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. The Linux kernel (at least version 2.0.0) and linux libc (at least version 5.2.18) does not agree entierly on what the specifics of the systemcall interface to set nice values is. Thus causes renice to report bogus previous nice values. |
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. The Linux kernel (at least version 2.0.0) and linux libc (at least version 5.2.18) does not agree entierly on what the specifics of the systemcall interface to set nice values is. Thus causes renice to report bogus previous nice values. |
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HISTORY |
=== HISTORY === |
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The renice command appeared in BSD 4.0 |
The renice command appeared in BSD 4.0 |
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REFERENCED BY |
=== REFERENCED BY === |
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nice(2) |
[[nice]](2) |
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</pre> |
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see also: [[nice]],[[process priority]] |
Revision as of 10:35, 29 March 2006
renice(8) - Linux man page
NAME
renice - alter priority of running processes
SYNOPSIS
renice priority [[-p ] pid ... ] [[-g ] pgrp ... ] [[-u ] user ... ]
DESCRIPTION
Renice alters the scheduling priority of one or more running processes.
The following who parameters are interpreted as process ID's, process group ID's, or user names. Renice'ing a process group causes all pro- cesses 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.
Options supported by renice:
-g Force who parameters to be interpreted as process group ID's.
-u Force the who parameters to be interpreted as user names.
-p Resets the who interpretation to be (the default) process ID's.
For example,
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), any- thing negative (to make things go very fast).
FILES
/etc/passwd
to map user names to user ID's
SEE ALSO
getpriority(2), setpriority(2)
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. The Linux kernel (at least version 2.0.0) and linux libc (at least version 5.2.18) does not agree entierly on what the specifics of the systemcall interface to set nice values is. Thus causes renice to report bogus previous nice values.
HISTORY
The renice command appeared in BSD 4.0
REFERENCED BY
nice(2)