Re: NUMA remote memory access cost

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

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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