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CentOS5.2 Two Quad Core CPUs - Load Average Going Crazy

My normal CPU load average is less than 1.0. However, once in a while for some unknown reasons, the CPU load average shoots up to 23.21, even though the connections and processes running are the same ...
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Limiting maximum cpu time for user-launched programs

We have a cluster running CentOS with Sun Grid Engine for research simulations. However, some users who aren't too familiar with the system end up running jobs on the head node, which of of course ...