[Beowulf] Moores Law is dying

Greg Lindahl lindahl at pbm.com
Wed Apr 15 16:00:14 EDT 2009


On Tue, Apr 14, 2009 at 03:44:17PM -0700, Christian Bell wrote:

> Sure, capacity and conflict misses will apply like 
> they do in any cache but Jon's statement remains correct -- in SPMD 
> applications, you really want all processes to benefit from cache hits in 
> your "single program".

... then why do vendors make such a fuss about duplicating program
text pages in big NUMA machines?

As an example:

www.sc2001.org/papers/pap.pap241.pdf

The issue is that fetching from distant memory is expensive, even if
there's no writing going on. Locality, locality, locality.

-- greg



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