Author: Robert Hyatt
Date: 10:05:52 06/26/03
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On June 26, 2003 at 01:39:08, Eugene Nalimov wrote: >On June 26, 2003 at 00:10:02, Cameron Hayne wrote: > >>I recall Bob Hyatt saying a while back (on the newsgroup rgcc) that one of the >>things he had to take account of in moving from Cray Blitz to Crafty was the >>relatively slow memory bandwidth of PC-class machines. I think one of the most >>significant improvements of the G5 is the huge increase in bus speed - it runs >>at half the speed of the CPU. This might enable some improvements in Crafty. > >Unfortunately, G5 has higher main memory latency than G4. It went up from 93ns >to 135ns. > >http://developer.apple.com/technotes/tn/tn2087.html > >Thanks, >Eugene That's what happened on _every_ new Cray. Raw memory latency doesn't improve with bus speed, in general, just raw bandwidth potential if memory is highly interleaved (and it is on the Cray of course.)
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