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I suspect that the most common use case is when you start a program with the default priority, then realize that you meant to run it with a low priority. renice can also be useful if there are certain times when you want to give certain programs a higher priority (e.g. to give the logged-in user's programs a higher priority than that of other users'), but ...


Typically I've only looked at renice when there is a potentially long running process that could bog down the system. For instance when running ffmpeg video conversions I renice those processes so that it doesn't bog down apache for serving web requests. Now in a proper environment the ffmpeg conversions would be running on another server and could not ...

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