Author: Greg Simpson
Date: 18:01:53 12/07/05
Go up one level in this thread
On December 07, 2005 at 17:00:54, Andreas Guettinger wrote: >On December 07, 2005 at 16:51:10, Aaron Gordon wrote: > >>On December 07, 2005 at 16:39:16, Ed Murak wrote: >> >>>At http://www.talkchess.com/forums/1/message.html?467829 you collated these >>>results - >>> >>>... >>>124651 = AMD Opteron 275, 2.2ghz, 32 bit (WIN x64) >>>124651 = Athlon 64 3500+ 2.2GHz 32 bit >>>... >>>110801 = Pentium-M 2.0GHz 32 bit >>>110801 = Pentium 4, 3.6 ghz,560 Prescott, 32 bit (WIN/XP) >>>110801 = Athlon 64 3200+ 2GHz 32 bit >>>... >>> >>>Does it not seem a little strange that the precisely, exactly same "nps" is >>>reported for widely-differing CPUs (Athlon and Pentium 4 and Pentium M, say)? >>> >>>In just 17 results, 3+2=5 exact collisions with such big numbers involved is >>>beyond a coincidence. >>> >>>Is there some granularity in the test that we don't know about? If not, is >>>"nps" reported always inversely proportional to "time" reported, for the same >>>initial conditions and 3988843 node count? If not, would "time" be a better >>>measure? >>> >>>I >> >>It is possible time IS a better measure, but we had to collect the results as-is >>to figure this out. :) >> >>It looks like it is just rounding to the nearest second. This would be ok for >>longer runs (maybe 200 seconds?), but my PC took just over 15 seconds. This is a >>bit of a difference I think, and would like to see more accurate results. Only >>problem would be having everyone now re-run it and calculate the NPS by hand >>from the time in ms and total node count. > >Now that you mention it, I get a diffrent value when I calculate form hand: >info depth 14 time 32111 nodes 3988843 nps 128672 >info time 32113 nodes 3988843 nps 128672 > >form hand:3988843/32.113 = 124212 nps ? > >- andy > >Athlon64 3400+ 2.4Ghz 512kb L2 cache Oddly enough the computer calculation seems to have used exactly 31 seconds, not 32.
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