Well, I’m back to it. I haven’t blogged here for a year or so for multiple reasons, such as changing jobs, moving, etc. I am now working as a Systems Engineer for another Internet company in Irvine, CA.
Anyway, right to it. Here’s a right useful tool. htop.
htop is useful because it gives you an idea of usage per core instead of an average. And it’s pretty too.
I find it useful when attempting to debug java problems. I had an issue with two separate java programs that were hanging on a 16 core box. Running htop showed me that one of the cores was showing 100%, and this was concurrent with a heap space set too low error. So I upped heap space, and voila. fixed.
How is that helpful? The second java program just hung and gave me no such error. But having seen the same kind of problem in htop, I knew exactly how to fix it, and fix it I did. Thereby allowing me to save the day. All in a day’s work for a Sysadmin.