Author: Slater Wold
Date: 08:10:00 11/20/01
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On November 20, 2001 at 10:26:40, Gordon Rattray wrote: > >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. I tested this with my first dual machine, and the answer is that it is almost exactly the same. There was less than 1% difference in all the tests I ran. >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?! Doesn't matter. >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? This is the speedup I see: Crafty 1.89x Junior 7 1.81x Deep Fritz 1.31x Deep Shredder 1.81x >thanks in advance for any answers > >Gordon
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