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Subject: Re: The need to unmake move

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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