Author: Vincent Diepeveen
Date: 04:28:17 09/25/01
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On September 25, 2001 at 00:40:53, Robert Hyatt wrote: >On September 24, 2001 at 23:45:30, Dave Gomboc wrote: > >>On September 24, 2001 at 22:30:26, Vincent Diepeveen wrote: >> >>>Hello, >>> >>>Here written down speedups as claimed by a guy called R. Hyatt >>>by cray blitz for 24 different positoins as they occured in >>>a game: >>> >>>pos speedup >>>1 2.0 >>>2 2.0 >>>3 2.0 >>>4 2.0 >>>5 2.0 >>>6 2.0 >>>7 1.9 >>>8 2.0 >>>9 2.0 >>>10 2.0 >>>11 2.0 >>>12 1.9 >>>13 1.9 >>>14 2.0 >>>15 2.0 >>>16 1.9 >>>17 1.7 >>>18 1.8 >>>19 2.0 >>>20 2.0 >>>21 2.0 >>>22 1.9 >>>23 2.0 >>>24 2.0 >>>avg 2.0 >>> >>>So YOU, Robert Hyatt, claims in an OFFICIAL magazine, >>>called ICCA journal march 1997, >>>an AVERAGE speedup of 2.0 with cray blitz at 2 processors. >>> >>>Now i claim the same with DIEP if i'm not using dangerous >>>extensions (which btw are turned on by default). >>> >>>It appears you hadn't turned them on either (smart guy >>>to publish only speedups without dangerous extensions and only >>>tell in 2001 that you hadn't turned them on). >> >>2.0 isn't a problem, it's >2.0 that gets people up in arms. >> >>Dave > > >It isn't even 2.0... I don't have the paper handy now but I seem to recall >that it was 1.9. Certainly it isn't 2.0 just by inspecting the numbers he >gave... > >And the 4 8 and 16 processor tests were worse. But comparing them to crafty is When i tested with 4 i also never got > 4.0 with normal diep versions, so very consequent with Cray Blitz, of course there are good reasons why my speedup tests i get 2.0 in practical game play at tournament level versus cray blitz 2.0 in practical game play getting the same at 2 processors. Bob explained me quite clearly how he had done things in Cray Blitz, my entire algorithm is based upon that of course! I am sure that if cray blitz would run on 2 faster Cray processors, or simply run longer, that then all its findings will be similar to my findings! >very hard because of the different approaches to almost everything from move >ordering to search algorithm... Crafty is recursive, only when you have your own program parallel you will understand what a big difference in parallel speedup this means for DIEP + Cray Blitz. I do not know whether Fritz is recursive. It's assembly, so perhaps Frans can somehow avoid recursive problems in assembly in a smart way.
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