Measuring Heavy CPU Usage Over Time On Linux And Unix

[ Thanks to Mike Golvach for this link. ]

"In the first screenshot, we've isolated process id 499 (which happens to be the X server), since it's the only process on the box that meets the "CPU percentage" criteria. Once it finds that process, it adds it to the default temporary file (the simple way to maintain state ;). We then populate the /tmp/munchiestats file with a whole bunch of other PID's (some real, some non-existent) and multiple instances of PID 499 (but, less than 9, so we don't trigger the kill on the next execution) and cat that so you can see the contents:

"In the second screenshot, we run munchies again and see it clear all the PID's in the temp file that are legitimate, but aren't using over 10% of the CPU anymore. We also free any PID's in the temp file that don't exist any more (possibly, from a process exiting, but - in this case - because we just made them up ;). The final run executes the kill of PID 499 and removes it from the temp file:"

Complete Story

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