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using an [AMD] Opteron 6234 6 module / 12 core processor This score for the 6-Core AMD Opteron @ 2.4GHz[1] 137,913 req/s falls short of our 850,000 req/s on an Intel 6-Core Xeon W3680 @ 3.33GHz[2] (with a 100-byte static file). Besides the differences of each architure performance*, the problem for G-WAN comes on AMD CPUs from the fact that we did not ...

It's just a guess, and so i may be completely wrong...but Opteron is a NUMA architecture. Sometimes programs are optimized for non-NUMA (very common) architectures, and then the performance is low in NUMA environments. To test this, you can run exactly the same version of G-Wan with the same data (or almost it !) in a Phenon or i7 that are comparable with ...