Author: Sune Fischer
Date: 12:25:36 06/20/02
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On June 20, 2002 at 14:25:17, Eugene Nalimov wrote: >Tom, > >Bob pointed out that fastest CPUs for Crafty are 64-bit CPUs. Right now it is >Itanium2, some time ago it was Alpha. > >As you pointed out that not necessarily means that 64-bit CPUs are good for >Crafty because of the 64-bit data path, but there are good chances that 64-bit >data path helps. The question is how much. Unfortunately, experiment you >suggested is flawed, as I wrote in one of my recent postings, and I don't see >another quick way to answer the question. My "gut feeling" is ~10%. > >Eugene So what you are saying is that you can't just count the number of operation and use that to pridict the speed? I mean the bit operations which in Crafty use more than 1 clock on 32 bit chips, probably 2-3 clocks. Ideally they will use 1 clock on a 64 bit chip. Now if Crafty is 50% 64 bit operations then we can expect a factor of two in speedup on that 50%, right? How does that reduce to 10%, do you expect there to be some bandwidth bottleneck? If so it seems the 64 bit chips will not be using their full potential as optimal as the 32 bit chips are doing now, else I just can't get the math to make sense. -S.
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