Author: Robert Hyatt
Date: 19:11:09 05/13/04
Go up one level in this thread
On May 13, 2004 at 21:59:25, Russell Reagan wrote: >On May 13, 2004 at 20:35:39, Robert Hyatt wrote: > >>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... > >That makes sense. I guess it isn't hard to get a linear speedup if you only >measure nodes per second (mostly uneccessary, duplicated work?). Is >time-to-solution the same thing as time-to-depth? Yes...
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