Author: Russell Reagan
Date: 17:02:16 05/13/04
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On May 13, 2004 at 18:44:50, martin fierz wrote: >while this is all correct, remember that doubling the number of processors very >clearly has diminishing returns :-) > >while going from 1->4 is a 3.1 speed increase (i think we can trust this magic >number by now...), going from 4->16 will be a much smaller improvement. and of >the commercials, at least fritz is also capable of running on a 4-way box. don't >know too much about the others, but i guess that most can run on at least a >dual. On a NUMA machine, Crafty does much better than 3.1x on a quad. Here is one post by Bob where he gives 3.9x for a quad. I seem to recall seeing the number 3.98x for a quad, and reading Eugene saying that Crafty scaled almost linearly on a NUMA machine, but I couldn't find any posts indicating that, so I might be wrong. http://chessprogramming.org/cccsearch/ccc.php?art_id=345901
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