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Brad Israel

Code craftsman, snowboarder, and beer/scotch lover

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For my post about writing a Go Packet Sniffer I needed a way to quickly log and graph the CPU/Memory usage of any process. Turns out that getting the CPU usage of a single process is not as easy as it seems. After using some Google-fu, I found an answer on Stackoverflow and an article that graphs memory usage using ps and the gnuplot library. I cobbled together a bash script that combines and automates everything together based on a process name and PID. To use, just install gnuplot and make sure the gnuplot command is in your path. Then run script like:

./ Xorg

You may also specify the PID manually if multiple processes use the same name, I.E. chrome:

./ chrome 12127

By default it will watch the process for 60 x 1 second samples and then output a graph as a png image. The timeout and number of samples can be changed by modifying the variables at the top of the script if you want to watch the process for longer. This post is mainly so that I remember how to do this in the future, but other people might have the same problem.

The full script is embedded in the gist below.