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In my current setup (debian squeeze x64, 6 cpus) neither java nor apache seem to utilitze the full potential of the server. The munin monitoring shows cpu usage never exceeds the 200% mark. We ran several stress tests which raised the server load up to 80, but the cpu usage always remained low. Any ideas?

Willi Schönborn
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    Have you double-checked that the CPU usage really is that low? It's entirely possible that Munin graphing does not work as expected and if observing the server from shell with `top` or other utilities, CPU usage is working as expected. – Janne Pikkarainen Jun 09 '11 at 07:03

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Have a look at this document about optimizations for running on multi-core systems

There's a heap of stuff in there, everything from how to structure code to stuff like numactl for controlling processor affinity.

Philip Reynolds
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