Author: Robert Hyatt
Date: 17:35:39 05/13/04
Go up one level in this thread
On May 13, 2004 at 20:02:16, Russell Reagan wrote: >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 Wrong kind of speedup. You can measure raw NPS improvement, which is what your link is about; You can measure time-to-solution speedup. Which is what the 3.1 is about that we have discussed here...
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