Author: Robert Hyatt
Date: 21:38:36 09/24/01
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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 Please re-do your math. No way to average 2.0 with even _one_ value that is < 2.0 There are several above that are less than 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. > I don't see an average of 2.0... >Now i claim the same with DIEP if i'm not using dangerous >extensions (which btw are turned on by default). No... You claim > 2.0 which is not possible over a set of positions. Unless your sequential search is simply badly flawed. Then it doesn't matter. Go get a copy of my Ph.D. dissertation. I proved quite clearly that for a minimax search (alpha/beta with worst-possible ordering) it is possible to get a near-perfect speedup curve. I also proved that with perfect ordering, the same is possible. But The real point was that I clearly proved that we can't get perfect move ordering (for obvious reasons) so that for normal cases, an optimal (4.0 using 4 cpus) is not possible. > >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). I was supposed to tell I hadn't turned on something I was not using because it caused a serious problem??? I don't follow that logic. And I don't consider the SE as "a dangerous extension". I don't do "dangerous extensions" anywhere in my code, either now or then...
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