The last commenter on the original thread is absolutely right: Rails follows different "concurrency model", i.e. it needs multiple processes to run well, especially on multi-core CPUs. He needs to create a cluster of 4-6 mongrels on 2-core CPU and the margin will shrink.
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The last commenter on the original thread is absolutely right: Rails follows different "concurrency model", i.e. it needs multiple processes to run well, especially on multi-core CPUs. He needs to create a cluster of 4-6 mongrels on 2-core CPU and the margin will shrink.
This is the next thing I'll test.