[cluster-l] Single- vs. Dual- vs. Quad-core CPUs

[Ricky Robertson]

isn't this about memory access? it would make sense if the Xeon were ever so slightly faster than the opteron in terms of raw processor speed but had a memory access strategy that is less scalable. hence, when the memory bus (and/or interface to the network as the case may be) is wide open for the single core, the more efficient processor wins (i.e., xeon) whereas when a bunch of cores are fighting for access to the memory, the one that can manage all that traffic better wins (i.e., opteron).

just some thoughts from a non-expert.

quiescence,

ricky

---- Original message ----
>Date: Wed, 28 Mar 2007 13:57:02 -0500
>From: Nils Oberg <noberg at uiuc.edu>  
>Subject: Re: [cluster-l] Single- vs. Dual- vs. Quad-core CPUs  
>To: Jim Phillips <jim at ks.uiuc.edu>
>Cc: cluster-l at ks.uiuc.edu
>
>Thanks for your help Jim.
>
>I performed some benchmarks on demo equipment from AMD and Intel and 
>there are some interesting differences between the two platforms for 
>our code.  All times are in seconds.
>
>Here are some results:
>
> ...