Author: Jeremiah Penery
Date: 06:39:55 09/01/03
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On September 01, 2003 at 06:09:48, Mridul Muralidharan wrote: >Hi Jeremiah, > > If you want crafty to get to work with a decent speedup on a 16 or 32 CPU >cc-numa where you have say 2 - 4 processors per node with a significant >inter-node latency (like most higher cpu numa boxes ?!) , you will have to >ensure that the way you split , memory usage , etc is optimal - you dont want to >access a hash entry in proc 0 from proc 32 when the latency wil be in >milliseconds !!! The specific discussion was about Opteron machines up to 8 CPUs, which will all be contained in one node and have extremely low non-local memory latency. Any large (multi-node) SMP machine will have the same problem as NUMA with respect to inter-node latency. SMP doesn't magically make node-to-node communication any faster. But in reality, almost nobody uses a machine that big, especially for chess. For any but the most extremely scalable architectures, there is significant diminishing returns when adding processors for chess playing. I'd say that a very scalable 8-way SMP or NUMA (Opteron) machine will not be very much slower than even a 64-way Alpha/Itanium/xxx machine for chess.
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