I am reposting a very interesting post I had at my old linux blog http://ventrix24.blogspot.com
After reinstalling my whole system, I thought it would be nice to have a remote monitoring system.
So I set up munin on my vps. (cacti was my alternative option)
After a few days, I noticed something really strange at munin’s logs.
From your eyes there’s nothing unusual. Except from one thing. At 00:00 on Thursday I was actually working on the pc for about an hour. This can be proved by the eth0 traffic.
What was happening the rest hours?
I was trying to figure out, why my pc uses the cpu when I am NOT using it.
It was very tricky, but after 2 minutes I was able to isolate the problem.