Author: Roy Brunjes
Date: 10:32:42 05/06/01
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On May 06, 2001 at 12:16:06, Laurence Chen wrote: >On May 06, 2001 at 11:37:02, Jorge Pichard wrote: > >>On May 06, 2001 at 10:52:39, Jorge Pichard wrote: >> >>>Has anybody done any tests using a dual motherboard vs an equivalent Single >>>processor system? I would like to know if anybody has significant evidence as to >>>whether Deep Fritz performs better using a Dual motherboard vs a Single >>>Processors. Another intersting experiment would be to test Chess Tiger 14 using >>>an AMD Athlon 1.3 GHz vs Deep Fritz using a dual motherboard 700 or 750 MHz. >>> >>>Please provide result if anybody has done experiment specially using DF. >> >> >>>PS: My question should have been what dual Intel motherboard performs equal to >>an Athlon 1.3 Ghz? Probably the best way to test it would be to use Deep Fritz, >>but I have a wild guess that an Athlon 1.3 Ghz can outperform a dual 800 MHz. >> >>>Pichard. >Why not measure equal CPU's, say, Dual 1 GHz against a single 1 GHz? If you >think that it's an unfair test, than why should you think that a dual 800 MHz is >equivalent to a 1.3 GHz system? For the simple reason that you do not get a linear scaling of performance with multi-CPU systems running a single application. I.e. 800MHz x 2 does NOT give 1.6 GHz of performance to a chess program. The best scaling I have seen is about 75% in moving from 1 to 2 CPUs. This would mean that you get 800 MHz of performance from the first CPU, but only 800 * .75 or about 600 MHz of performance equivalent from the second 800 MHz CPU. That would put the two CPU system (each CPU at 800 MHz) at about 1.4 GHz of performance for this hypothetical application. But it is not even that easy. Each program will have its own scaling characteristics, so it is not as easy to determine the performance of Chess Program X in a multi-CPU environment by using a formula alone. The best method is to test each program to see how much it benefits from the second (and third, and fourth and ....) CPU. Roy
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