why did i need to stop java software?

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http://serverfault.com – 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 t (HowTos)