Author: Vincent Diepeveen
Date: 14:19:26 02/01/05
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On February 01, 2005 at 16:28:22, Robert Hyatt wrote: Still didn't read the subject title? [snip] >Because a cluster can't offer 1/100th the total memory bandwidth of a big Cray >vector box. Actually todays clusters deliver a factor 1000 more or so. Total bandwidth a cluster can deliver is measured nowadays in Terabytes per second, with Cray it was measured in gigabytes per second. Note it's the same network that gets used for huge Cray T3E's, but a newer and bigger version, that's all. Crays had usually when in vector like what was is 4 cpu's or so? Sometimes up to 128. Above that it was T3E which had alpha's. that one used quadrics usually :) However look to France now. New great supercomputer. 8192 processors or so. Say 2048 nodes. You're looking at 3.6 TB per second bandwidth :) Those Crays you remember were 100Mhz ones. Network could deliver of course exactly what cpu could calculate. Not so great if you look to the total number of Gflop it delivered. Nowadays the big clusters, as all big supercomputers nowadays are clusters, are measured in Tflop and one already in Pflop :) There is a 0.36 Pflop one now under construction :) Vincent
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