Author: Robert Hyatt
Date: 06:54:47 11/10/03
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On November 09, 2003 at 07:52:54, Vincent Lejeune wrote: > >A paper about the new supercomputer (peak at 40 Tflops) "Red Storm", end >building in August 2004 > >http://www.lanl.gov/orgs/ccn/salishan2003/pdf/camp.pdf > >Bob could give a critical view of this new supercomputer, please ? :) >Are all the informations in this doc really accurate ? > >All this paper seems to be about too good :) This is just another cluster. A very big one, with a better interconnection scheme (3d mesh rather than the usual ethernet or hyper-cube approach to things. But it is based on traditional computers with local memory, connected in a very fast way. No shared memory, everything is local to each processor. It's interesting. But not for chess, particularly. It is a pure message-passing architecture based on the classic MPI solution. Using that many processors effectively has never been done by a chess program... It is also really tailored to particular types of matrix math because of the 3-d mesh interconnect. IE interior nodes are connected to 6 nodes, up, down, left, right, front, back. You can get data to/from those six nodes quickly. If you have to go farther, you have to go through those as the first hop. For a 1000 node machine, you have a worst-case transit time of 18 hops for one corner to talk to the opposite corner (in 3d space). This makes mapping the algorithm to the architecture critical, to minimize these "hops"...
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