Author: Matt Taylor
Date: 10:53:25 12/05/02
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On December 05, 2002 at 09:41:41, Brian Katz wrote: >Could someone please explain the difference between the AMD Athlon >2600+ processor and let's say multi processor 2 x 1000. >Even if we use Pentium as examples such as 1 x 2.0 gig vs 2 x 1.0 gig. Would >they be the same? Someone had told me that a 1x2000 is faster than a 2x1000. > >Please explain the difference. > >Thank you > >Brian Katz Dual machines theoretically are as fast as a single machine running at the sum of the clock speeds (throwing out artifacts like IPC that make different CPUs run faster/slower at different clock speeds.) However, this never empirically holds true. There are many additional overheads in SMP (synchronization, extra bus arbitration, other factors) which prevent an SMP machine from really being 2x a single-CPU machine. A quad-CPU system is the same, but it scales even worse. If you have 2 programs that don't need to communicate, which does not include Crafty, they will run very close to the speed that they would on two physically seperate machines. -Matt
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