why did i need to stop java software? [closed]

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i am on Debian Squeeze, 4G of Ram, 1G of Swap, CPU i3 3.07GHz.
I used to use the following java softwares:

jenkins
elasticsearch

Problem was their process was too greedy about CPU, in the top command, each one was eating more than 120%.

When i noticed this, i switched from open-java to sun-java, but this did not do the expected trick.

I have a very little load on the server, but the over consumption of the CPU made the other processes go more slowly. (My web-stats for delivering pages show it clearly).

Since I have stopped elastic search, killed (the unstoppable) jenkins and then flush the cache memory, lighttpd regained its speed.

Any idea why these java processes can be so greedy ?
And why jenkins needs X11 although I don’t need that at all ?

Answer

When were you hit? Could it be the leap second problem that hit on both July 1st and recently on certain servers on August 1st, causing both Linux kernel crashes and Java CPU load problems? Here’s one of the main references for the July leap, and a thread about the August leap.

Attribution
Source : Link , Question Author : Keil , Answer Author : Community

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