Author: Robert Hyatt
Date: 20:24:50 06/29/00
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On June 29, 2000 at 03:38:38, Albert Silver wrote: >On June 29, 2000 at 02:21:10, Gregor Overney wrote: > >>>Not even close yet. That hardware would be approximately 1% of the power of >>>the DB hardware. And that is being _very_ generous... >> >>1% is a pretty good estimate for a four processor machine using four P5-4 >>running at 1.5 GHz using a four channel RDRAM bus that delivers 3.2 GB of data. >>Estimate 500 kNodes per CPU times 4 = 2M Nodes = 1% of DB's avarage performance. > >If one CPU achieves 500k nodes, I doubt very much that 4 CPUs will achieve 2M >nodes, unless 100% efficiency has been achieved. Crafty is apparently the most >efficient at this level though only Bob would be able to say how well it should >do. > > Albert Silver In general, I figure 4 cpus to be about 3x faster. I actually do a bit better normally (3.2x is a good average) although I can go 4x in some positions. But for raw nps, the PC with 4 cpus simply can't support 4x the performance unless the program really comes close to fitting into L2 cache. The memory bandwidth on the PC is a bare dribble compared to what it needs.
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