Author: Tom Kerrigan
Date: 13:47:52 08/20/04
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On August 20, 2004 at 16:23:12, Robert Hyatt wrote: >>Ah, so, some qualification, in case I run the experiment and get different >>results. How about you send me the version of Crafty that showed an improvement >>from 512k to 1024k? > >No idea which version it was. I could try to figure out when I first bought my >original quad xeon, and track the version back to that, but does it really >matter? > >You ran a simple experiment and drew a conclusion that is as accurate as >flipping a coin and calling heads. If you are happy with the coin toss model, >fine by me. I just downloaded Crafty and ran bench on an Athlon 64 3000+ and an Athlon 64 3200+ (the difference being the amount of L2 cache, 512k vs. 1MB) and the result was _identical_. Looking at the log files, times were off by 0.01s here and there, so the timing function seemed to have good resolution. IDENTICAL nodes per second. I based my conclusion on one datapoint and a good knowledge of computer hardware and chess programs. If you think my knowledge is as valuable as a coin toss, fine. But a second datapoint (doing an experiment that you yourself suggested would have a different outcome) only serves to support my conclusion. So, Occam's razor, do I understand how computers work, or am I just really lucky? -Tom
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