On Tuesday 07 February 2006 18:42, Christoph Lameter wrote:
> > > and therefore there are only small latencies
> > > involved. NUMA only gives small benefits.
> >
> > That's also not true. Everytime I get memory placement for
> > process memory wrong users complain _very_ loudly and there
> > are clear benefits in benchmarks too.
>
> What are the latencies in an 8 way opteron system? I.e. Local memory, next
> processor, most distant processor?
The NUMA factor is surprisingly good because of the way the cache coherency
works even the local memory access gets slower with more
nodes @) iirc it's <3. Worst case latency tends to be <200ns.
-Andi
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