Author: Slater Wold
Date: 16:46:24 09/30/01
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On September 30, 2001 at 16:45:37, Roy Eassa wrote: >On September 29, 2001 at 15:34:45, Slater Wold wrote: > >>On September 29, 2001 at 14:42:02, Joshua Lee wrote: >> >>>Sue me if i am wrong but you don't get 2X with Dual Systems more like 1.7x and >>>sometimes less sometimes more when in comes to chess so 2380Mhz sounds more >>>correct. >> >>I won't sue you. :) >> >>But you are correct. Some get 1.9x (Crafty) and some get 1.3x (Deep Fritz). >> >>I think it's a little more than 2380mhz though. Perhaps 2600mhz. Which is >>still faster than 1600mhz. >> >>Not to mention, I can get a full 1400mhz out of 2 applications, while he can >>only get 1600mhz out of 1 application. > > >Pardon my ignorance, but are you saying you can run separate non-MP-savvy >applications on each of the two CPUs? What's the mechanism/UI for something >like this? Yes! It's called, "Affinity". You can have 1 application performing its tasks, using 1 CPU, and another application performing its tasks using another CPU. Normally, when running an application, you use 50% of one CPU and 50% of the other CPU. Giving you 100% usage. Sometimes this can be slower than running the entire task on 1 CPU, and under Windows 2k, its pretty simple to set the "affinity" for each running process. For example, you can tell Win2k to run "Fritz6.exe" on CPU #1 and "Junior6.exe" on CPU #2. And both applications are speeding along at 1400mhz. That's what enables you to use perm brain on engine vs. engine matches. Because each engine will have a full thread to execute their processes on. Unlike a single CPU machine, where one engine gets 50% and the other gets 50%. Slate
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