Author: Robert Hyatt
Date: 14:55:38 09/07/01
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On September 07, 2001 at 14:14:54, Gregor Overney wrote: >On September 07, 2001 at 09:49:47, Robert Hyatt wrote: > >>On September 07, 2001 at 01:23:35, Joshua Lee wrote: >> >>>Recently in a response to my post about TYPP test set i was saying that someone >>>can get a faster computer and that's not what Correspondence is about etc blah >>>blah >>> >>>Well i mentioned the DEC Alpha with 512 Cpu's >>>but apparently crafty and other programs will not work on this. >>>What is the fastest system for Ferret or Crafty or any onther program that can >>>be run on these unix type systems? >>> >>>What about Dual booting Something like this ? Deep Fritz only uses 8 cpu's what >>>about other "Deep Programs"? What is the Ecentric Wealthy Chessplayers options >>>here? What about the Quad 800Mhz Itanium ? >>> >>>Thankyou >> >> >>I can only speak for Crafty. It can run on any platform that is SMP. It >>won't (currently) run on message passing architectures like the cluster of >>alphas you mentioned. The largest number of processors I have tested with >>was 32. But there is no real limit in that regard, just so the machine is >>based on shared memory and not message passing. > >If I remember correctly, Cray Blitz was running on an X-MP with 2 or more CPUs. >Since this system is not using SMP (right?), you still have code that could run >on non-SMP-based super computers. >\ All the Cray machines (except for the T3 alpha-based ones) are fully SMP. The XMP, the YMP, the C90 and the T90 were all shared memory, fully SMP machines. >Do you plan to update/revive Cray Blitz for those machines or change Crafty? The >reason I am asking is that SMP has to share its memory space while other >architectures do not suffer under the limitations of accessing the same memory >blocks with multiple CPUs but can dedicate their fullest potential to their own >memory sub-system. For chess this might be a great improvement. No? > >Gregor No. Too much needs to be shared, which is why the message-passing machines don't do as well as SMP machines. Message passing is a real challenge in the context of chess and alpha/beta searching with global hash tables.
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