NUMA remote memory access cost

Thu Jan 8 12:47:49 PST 2009

Michael Neumann wrote:
Today I had a discussion about SMP and NUMA with my students and I
realized that Opertons really are NUMA as memory accesses are
non-uniform (I was under the impression that SMP not necessarily imply
UMA and that SMP/NUMA are othogonal aspects).
Anyone knows the cost (in case of an Opteron) of a remote memory access
vs. a local memory access?
Last OSDI there was a paper exploring explicit (userland-driven) data 
partitioning of kernel structures, which includes these numbers and much more:

http://www.usenix.org/events/osdi08/tech/full_papers/boyd-wickizer/boyd_wickizer.pdf
http://www.usenix.org/events/osdi08/tech/full_papers/boyd-wickizer/boyd-wickizer_html/index.html
cheers
  simon
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