Author: Robert Hyatt
Date: 06:58:00 11/19/00
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On November 19, 2000 at 01:09:11, Gregor Overney wrote: >>The program would be a hybrid approach. To run fast on the Cray requires >>a lot of vectorization throughout the program. Bitmaps are cute, but they >>don't run fast on a Cray without some vector stuff as well. >> >>NPS? CB could do 7M. Crafty should be able to do the same. It would >>be tough... but it wouldn't be Deep Blue by any stretch. Winning the >>WC? Difficult question. Such a machine won it twice, of course. A third >>time? who knows? > > >Let me ask you a stupid question? (Just in case you want to take time to answer >stupid questions at all.) > >Cray sells two types of supercomputers. One that has a lot of "standard" >micro-CPU's, such as the 21264, but a rather moderate bandwidth between CPU's. >And an other model (my personal favorite) that has less processors (4 to 32 >CPU's) but offers a tremendous bandwidth between CPU's. > >Which one would you chose? The one with much more processors but a slower >bandwidth or....a system with less CPU's but a much higher bandwidth if you had > Obviously the T3 family is _the_ machine to be used, due to the alpha processor and a tremendous number of them. The problem is that this is a message-passing architecture, while the T932 is a shared-memory architecture. In general, a message passing system is easier to develop software on (fewer bugs and race conditions). But performance is a real issue since everything must be shared via explicit messages between nodes. Shared memory is far more flexible, but also far more expensive. >1) enough $$$$$$$$$$$$$$$ >2) enough space and more than enough slaves to keep your Cray working >3) the urge to create the fastest combination of Cray system and Chess engine in >2000? > > >Gregor I still plan on doing a message-passing (PVM and/or MPI) version of Crafty, hopefully this year.
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