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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 213.43+6.2%Dec 19 9:30 AM EST
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To: TechieGuy-alt who wrote (27050)1/31/2001 8:54:54 PM
From: Joe NYC of 275872
 
TG,

Scumbria's explanation goes like this (I am paraphrasing): Suppose you have a bunch of processes or threads running at the same time. Let's say 4. If you have them running on a single processor system at the same time in multitasking environment, you have to evict a lot of useful data from the L1 and L2, just to bring in the other thread. The combined cache is 384 for 4 threads.

Now suppose you have a dual processor system running the same 4 threads, 2 on each CPU. Now you have a lot less need for switching contexts, and when you do, you have 384K of cache available for 2 threads, not 4 threads, so less data needs to be evicted when the context changes.

Joe
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