Author: Vincent Diepeveen
Date: 14:09:31 08/18/00
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On August 18, 2000 at 16:57:15, Dann Corbit wrote: >On August 18, 2000 at 15:57:38, Vincent Diepeveen wrote: > >>On August 18, 2000 at 13:38:28, Dann Corbit wrote: >> >>>On August 18, 2000 at 07:20:20, Vincent Diepeveen wrote: >>>[snip] >>>>First of all a 64 cpu machine is like, let's guess: 50 million dollars? >>> >>>5 million, give or take a couple million. >>> >>>>So also in 9 years of time we can't afford that. >>>> >>>>Secondly a 64 processor alpha is perhaps not having shared memory, so getting >>>>a good speedup is real tough then. >>> >>>It's SMP. >> >>is it SHARED or non shared memory? >> >>just that the processors are symmetrical multiprocessing is a bit >>little info for me! >> >>>>But i think bigger hashtables are giving your goal quicker as you think. >>> >>>I was figuring 4 Gig ram per CPU. The memory bus on that machine is >>>astonishing, also. >> >>aha so non shared. what is the latency of a message? >>i calculated that a cluster with a 1usec latency of a message >>is giving a speedup of less as root square. >> >>Obviously some techniques might be invented to get a better speedup >>at clusters. >> >>I prefer a 4 processor at 10 Ghz in 2010 however over >>a 256 processor of each 1 Ghz at a cluster. > >Here is the technical brief. Currently, 64 CPU models are only available in >Beta. They will be released for sale to the general public in 2001. You can >buy a 32 CPU version today. > >These 64 CPU's are not clustered. They are tied together with crossbar >switches. You can take the 64 node boxes and cluster them together. I am not >an expert on the technology, and the technical details are vague. > >http://www6.compaq.com/alphaserver/sc/sc_prod_profile.html I'm not a big expert on that either, but most high listed supercomputers at www.top500.org are not very nice to run chessprograms at. Talk to Rainer Feldmann about the problems he encountered! Alpha is known for its slow communication speed. Please don't confuse that with the speed of a bus. It's about a lot of random real SMALL messages which must be delivered in chess. where these systems are OPTIMIZED for HUGE messages of gigabytes wide, so the delay for the first byte is of hardly any concern then.
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