renice command: Change the Priority of a Already Running Process
Q. I'd like alter / change the scheduling priority of running processes. How do I change the Priority of a already running process under CentOS Linux or any UNIX like operating systems?
A. If you run CPU-bond processes you must use nice command used to start process with modified scheduling priority / nicenesses. renice command is used to change the priority of a process that's already running.
renice command syntax:
The renice command changes the nice value of a process already running. It's syntax is as follows:
renice {priority} pid
The following will change nice value of process 2243 to 19, enter:
# renice 19 2243
The following will change the priority of process ID’s 1024 and all processes owned by users vivek, enter:
# renice +1 1024 -u vivek
The following will change the priority of process ID’s 1024 and 66, and all processes owned by users daemon and root.
# renice +1 1024 -u daemon root -p 66
Please note that:
- Users can only change the nice value of processes which they own.
- User cannot start processes with nice values less than 20
- User cannot lower the nice values of their processes after they've raised them.
- As usual root has full access to renice command
For more details and options see renice command man page:
$ man renice
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Related Other Helpful FAQs:
- Linux nice command: Run Process With Modified Scheduling Priority ( nicenesses )
- chrt command: Set / Manipulate Real Time Attributes of a Linux Process
- Linux / UNIX: Find out or determine if process pid is running
- Linux find out what process are eating all memory and time allocated to process
- Kill process in Linux or terminate a process in UNIX or Linux systems
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June 13th, 2008 (4 weeks ago) at 2:37 am
perfect!