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cpulimit

A tool to throttle the CPU usage of other processes.

More information.

Limit an existing process with PID 1234 to only use 25% of the CPU:

cpulimit --pid {1234} --limit {25%}

Limit an existing program by its executable name:

cpulimit --exe {program} --limit {25}

Launch a given program and limit it to only use 50% of the CPU:

cpulimit --limit {50} -- {program arg1 arg2 ...}

Launch a program, limit its CPU usage to 50% and run cpulimit in the background:

cpulimit --limit {50} --background -- {program}

Kill its process if the program's CPU usage goes over 50%:

cpulimit --limit 50 --kill -- {program}

Throttle both it and its child processes so that none go about 25% CPU:

cpulimit --limit {25} --monitor-forks -- {program}

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