Author: Eugene Nalimov
Date: 11:25:17 06/20/02
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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 On June 20, 2002 at 13:59:53, Tom Kerrigan wrote: >On June 20, 2002 at 11:46:21, Robert Hyatt wrote: > >>You are saying "64 bits won't help 99% of the applications and so they are >>really no faster." I am saying "64 bits definitely helps Crafty which means >>for chess there _is_ a potential benefit for them." > >I said nothing of the sort and you have yet to indicate that 64 bits helps >Crafty. You named two examples of 64-bit chips that run Crafty fast. I can name >more examples of 64-bit chips that run Crafty slow. So that must mean that >64-bit chips hurt Crafty, except in some corner cases, right? > >Here we have a situation where an indicator (Crafty's performance) changes when >you change two variables (datapath width and THE ENTIRE REST OF THE CHIP). >Anybody who was paying attention during 6th grade science class could tell you >that you can't draw conclusions from this data, but apparently this is not a >prerequisite for computer "science" professors in Alabama. > >-Tom
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