Author: Ed Murak
Date: 15:53:18 12/09/05
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On December 09, 2005 at 16:16:39, Ernest Bonnem wrote: >In http://www.talkchess.com/forums/1/message.html?467780 >Aaron Gordon tried to look at the influence of L2 cache on the nps speed of >Rybka. > >But the way the UCI launch (to depth 14) leads to numbers is strange, in all >results reported. > >On my AMD mobile 2000+ (1.66 GHz, 32bit, L2=256k), the number of nodes attains >the correct value, 3988843, and the "time" in milliseconds ranged from 53328 to >54259 (in the 10+ tries I made). >But my nps was always the same: 76708, >which actually corresponds to a time of 52.000 seconds! >Strange rounding of 53.328 to 54.259 !!! > >So the accuracy of the nps calculation is , to say the least, relative, >particularly for fast machines (in the case of Aaron, the time of the 64bit >Rybka on his fastest machine was around 15 sec) > >Maybe some experts have an understanding and a way to prevent such inaccuracies? Yes. You missed my message from Dec 7, apparently - http://www.talkchess.com/forums/1/message.html?467851 where I already pointed this out. It is rounding down to whole seconds - note I do not use the term "nearest" anywhere - and very creatively! So solution, also by me from the same message, is nps ------> dev/null Use instead "seconds".
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