Author: Ernest Bonnem
Date: 13:16:39 12/09/05
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?
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