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Subject: Questions on dual machines

Author: Gordon Rattray

Date: 07:26:40 11/20/01



If a dual machine is used to run two different chess programs (non-SMP), each
using a single processor to itself, will this be equivalent to having two
separate single processor PCs (assuming the processors were the same)?  Or does
the use of a shared memory affect the performance? single bus?!  I'm also
assuming that the dual machine would have the combined memory capacity of the
two single PCs, so hash table sizes would be the same.

For the dual, what if both programs were accessing endgame table bases from the
same disc?  Both programs analyising the same position, so maybe cache hits?!
Different positions would cause more disk access?!

Can anyone give an opinion on the efficiency of crafy/fritz/junior/shredder (SMP
versions) when running on a dual?  Is 80% a fair estimate?  Can it vary
significantly depending on position?

thanks in advance for any answers

Gordon



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