Author: Robert Hyatt
Date: 13:15:04 07/11/02
Go up one level in this thread
On July 11, 2002 at 13:58:40, Keith Evans wrote: >On July 11, 2002 at 13:01:14, Robert Hyatt wrote: > >>On July 11, 2002 at 12:19:40, Keith Evans wrote: >> >>>On July 11, 2002 at 11:57:05, Robert Hyatt wrote: >>> >>>>On July 11, 2002 at 09:03:20, Rolf Tueschen wrote: >>>> >>> >>>>>The Hsu team of IBM did avoid it by introducing GM Benjamin into the testings. >>>>>IMO he had to check nonsense and contradictions of the play in relation to the >>>>>books. >>>> >>>>Apples and oranges. The DB guys _never_ tried to tune their program while >>>>running at 1/1000th the speed of the real machine. That was the problem we >>>>fell into. They had access to their machine all the time and could test in >>>>any way they wanted. We had little access to the Cray except right before >>>>an annual computer chess tournament, so all our development was _forced_ >>>>onto a VAX, which was far slower. >>>> >>> >>>How did you do your Cray development on a Vax? Did Cray supply an emulator? >>> >>>Regards, >>>Keith >> >> >>No. We were a FORTRAN-based program, and we just ran the cray-optimized >>version right on the vax after compiling with the vax compiler. It was >>horribly inefficient since the vax didn't know beans about vectors but it >>ran perfectly, just slowly... >> >>We always had FORTRAN versions of everything, even if we rewrote things in >>Cray Assembly for speed. That way we could change the fortran first (a far >>easier task) to check out a new idea. If it worked, we then had to modify >>the assembly code (a much harder task). > >So the only time that you had to test your Cray assembly code was right before a >tournament? I guess that you carefully checked each others work then. > >Regards, >Keith We could do very short tests thruout the year, on occasion. IE we had enough time to confirm that the pure FORTRAN and the FORTRAN + assembly versions would produce identical node counts for test positions. But we could not get enough time to play actual games for testing and tuning, very often. That was a real problem...
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