Author: Robert Hyatt
Date: 18:39:22 08/22/02
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On August 22, 2002 at 20:45:33, Eugene Nalimov wrote: >Several days ago I run Crafty on 3 different dual systems. I measured only nps >reported by 'bench', not time to solve something, so resulting numbers show how >efficient dual support in the system is implemented. > >PIII/800: 1.9x >P4/2GHz: 1.86x >Athlon/1.67 1.4x > >I.e. Athlon was much faster than P4 using single CPU, but became slower when >both CPUs were used. > >Thanks, >Eugene It definitely varies. I once had a dual 300 that was exactly 2x as fast as using one cpu. I didn't try to study the chipset to see what was going on however, but it was supposedly some sort of server-specific MB that was a good performer... what are the details about the athlon? IE FSB speed, etc. Obviously going faster on the FSB is not so great if memory stays at the same speed... > >On August 22, 2002 at 20:15:15, Robert Hyatt wrote: > >>On August 22, 2002 at 18:04:21, Rajen Gupta wrote: >> >>>On August 22, 2002 at 17:16:18, Robert Hyatt wrote: >>> >>>>On August 22, 2002 at 15:18:37, Gian-Carlo Pascutto wrote: >>>> >>>>>On August 22, 2002 at 15:17:55, Rajen Gupta wrote: >>>>> >>>>>>thanks: sorry for the obvious quesion but how fast is a 4 way compared to a >>>>>>single or a 2 way(i assume a 2 way is about 1.75 times a single) >>>>> >>>>>4 way is about 3 times faster than a single >>>>> >>>>>-- >>>>>GCP >>>> >>>> >>>>I don't think he was talking about chess. He was talking about number-crunching >>>>in general I assume. So the right answer is nearly 1.7 for a dual, nearly 4.0 >>>>for a quad, and nearly 6.8 for an 8-way box. >>> >>>sorry: i was actually talking about chess >>> >>>rajen >> >> >>In that case the answer varies significantly. 3.0 (as GCP gave) is a good >>rule of thumb. But then the other numbers I gave are too high. IE a dual >>is about 1.7x faster than a single before considering chess. It would be >>about 1.7x faster playing chess if memory was not an issue. As a result, >>a dual may well be slower than 1.7x for chess, as it depends on the memory >>system. dual servers may well have interleaving, while dual desktop machines >>typically don't to keep cost down.
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