Author: Keith Evans
Date: 10:58:40 07/11/02
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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
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