Author: Johan de Koning
Date: 00:00:52 08/26/03
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On August 25, 2003 at 18:04:29, Robert Hyatt wrote: >A single cpu that will run crafty at 1M nps has a cache-cache and cache-memory >bandwidth of X bytes/second. A single cpu that runs crafty at 2M nps has >exactly twice the cache-cache and cache-memory bandwidth and twice the clock >frequency. A dual-cpu just needs two cpus, but the two cpus give twice the >cache-cache bandwidth, but _no_ improvement in cache-memory bandwidth. Nope, C2M bandwith is constant, regardless of n and f (hence constant :-). Furtunataly C2M is not part of the equation. Unless n * f gets large AND all n processes make a habit of trashing their own cache or their fellow processors caches. But that just doesn't happen. >This was all about memory bandwidth with respect to copy/make. Nope, this was about memory having nothing to do with it. ... Johan
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