Author: Robert Hyatt
Date: 06:55:15 10/30/98
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On October 30, 1998 at 04:44:36, Ernst A. Heinz wrote: >On October 29, 1998 at 21:58:24, Robert Hyatt wrote: > >>On October 29, 1998 at 18:27:10, Terry Presgrove wrote: >> >>>Bob,Ed programers everywhere....just awe struck by the lastest >>>super computer just unveiled by V.P. Gore. At 3.9 Trilion calculations >>>per second just how strong would Crafty , Rebel, any of the comercialy >>>available programs be? Unless I misunderstood its Over 15,000 times faster >>>the the fastest PC's currrently available. More than 5,800 >>>processors....wouldn't it be nice to play around with this baby for just a day? >> >> >>first warning is a large number of processors... ie it isn't a shared memory >>machine, which means that it is not easy or efficient to distribute the search >>on such machines. If you have seen crafty on a 4 processor machine, and expect >>that to scale so such a machine, you'll be disappointed... >> >>However Sequent makes a 32 processor xeon-based machine that features a >>shared memory. *that* would scream... IE a NPS of something around 10M >>would be easy... > >Hmh, AFAIK the Sequent machines are all NUMA types with a shared >*address space* but non-uniform memory access times. I sincerely doubt >that your strongly coupled DTS scales well on such machines. > >But I am happy to be proven wrong by experimental results ... :-) > >=Ernst= we had an older one with 30 cpus here until about 3 years ago. It was a bus architecture with a flat shared memory design, large cache for each CPU, and so forth. I did most of the DTS program development (Cray Blitz parallel search) on that machine and it was pretty good... Haven't looked at them specifically in a while... but there are plenty of machines around with a symmetrical shared memory... when you hit NUMA you suddenly have to start thinking about what is allocated where to optimize performance... yet another "issue"...
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