I received an interesting email recently from a reader that takes offense at how I dare to discuss the differences between Intel Xeon 5500 (Nehalem) systems operating in NUMA versus SUMA/SUMO mode. One excerpt of the email read:
…and I think you are just creating confusion and chaos to gain popularity with your NUMA versus non-NUMA stuff. We tested everything we can think of and see no difference when booted with NUMA or non-NUMA…
I don’t doubt for one moment that the testing performed by this reader showed no performance differences between NUMA and SUMA because I have no idea whatsoever what his testing consisted of. And, besides, Xeon 5500 Nehalem EP is one extremely nice NUMA package. That is, when running non-NUMA aware software on this particular NUMA offering you can rest assured that you won’t likely fall over dead from NUMA pathologies. That’s good, but does that mean there really is no difference when booted in the NUMA versus SUMA? Hardly! more. . .
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