Renicing complex multithreaded applications in Linux

Posted by Vi on Super User See other posts from Super User or by Vi
Published on 2010-10-04T13:25:28Z Indexed on 2011/01/01 3:55 UTC
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linux

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process

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renice

Applications (especially big Java and C++ ones) often shows up as multiple lines in htop, each have separate PID and separate nice level. Also application can spawn a lot of child processes (like as in aptitude update), so I need to affect both parent one (to make new children have new priority) and child ones (to bring the effect immediately, not after the child terminates)

How can I apply "renice" or "ionice" or "schedtool" to already launched big application?

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