Jenkins Running at Very High CPU Usage

Jenkins running at very high CPU usage

As it turned out, my issue was that several jobs had thousands of old builds. This was fine in Jenkins 1.6 but it's a problem in 2.5 (I guess maybe Jenkins tries to load all the builds into memory when you view the job overview page). To fix it, I just deleted most of the old builds from the problem jobs using this strategy and then reloaded jenkins. Worked like a charm!

I also set the "discard old builds" plugin to keep only the 50 most recent builds, to prevent this from happening again.

High CPU usage of jenkins without running a job

I've solve the problem. The problem was my antivirus program. I uninstalled it and the usage is the whole day 0-1%.

Jenkins High CPU Usage Khugepageds

So, we just had this happen to us. As per the other answers, and some digging of our own, we were able to kill to process (and keep it killed) by running the following command...

rm -rf /tmp/*; crontab -r -u jenkins; kill -9 PID_OF_khugepageds; crontab -r -u jenkins; rm -rf /tmp/*; reboot -h now;

Make sure to replace PID_OF_khugepageds with the PID on your machine. It will also clear the crontab entry. Run this all as one command so that the process won't resurrect itself. The machine will reboot per the last command.

NOTE: While the command above should kill the process, you will probably want to roll/regenerate your SSH keys (on the Jenkins machine, BitBucket/GitHub etc., and any other machines that Jenkins had access to) and perhaps even spin up a new Jenkins instance (if you have that option).

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