Author: Robert Hyatt
Date: 08:48:33 09/04/01
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On September 04, 2001 at 10:51:56, Ed Schröder wrote: >On September 04, 2001 at 08:26:59, Robert Hyatt wrote: > >>On September 04, 2001 at 02:32:07, Ed Schröder wrote: >> >>>On September 03, 2001 at 21:27:30, Robert Hyatt wrote: >>> >>>>No, but you should stop making pronouncements about various processors, based >>>>solely on how your program runs on them. That is _not_ a good benchmark. I'll >>>>bet you any amount of money you want that Cray Blitz, in pure fortran, will >>>>run 10x faster than your program, on a cray. Because that code was designed >>>>to work on a vector architecture, and has specific algorithms designed to take >>>>advantage of that kind of hardware. >>> >>>Just curious, when was the last time you have started Cray Blitz on a Cray? >>> >>>Ed >> >>Maybe 6 months ago when the state got the new Cray up and running... That was >>the last time I believe. Prior to that it was either late last year or early >>this year when I had a chance to play 10 fast games vs Crafty using Cray Blitz >>on a T932. > > >Then you are able to tell the NPS you got for Cray Blitz and how this compares >with Crafty on your PC. > >TIA. > >Ed Yes. I have given this dozens of times already. Cray Blitz on a T932 searched at just over 7M nodes per second. Using 32 processors (the max that machine has been built with). Crafty on my quad 700 searches at around 1M nodes per second. I suspect that if I did the same things in Crafty that I did in Cray Blitz, with respect to things like mobility, that my Crafty speed would drop by 50% at least. An 8-way box would probably search 50% faster than my quad, roughly (not enough memory bandwidth). Which is significantly slower than a T90. The T3 would (could) be even faster, but the message-passing would not work with Cray Blitz as written (nor with Crafty).
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