[Fwd: Re: [Beowulf] Cell in HPC]
greg.lindahl at qlogic.com
Tue May 30 13:44:39 PDT 2006
On Tue, May 30, 2006 at 09:12:28AM -0500, Richard Walsh wrote:
> 2. Three tiered memory system with simple local memory (store,
> like old Cray-2) that is user/software managed is preferable to
> cache in the above context. Double buffering and prefetching to
> local store reduce memory delays dramatically.
I wouldn't make this comparison. The Cray 2 local store was much
easier to use than Cell's software-managed memory. And almost no one
actually used the Cray 2 local store. Which ought to be a lesson
Another example of a modern machine with software-managed local store
is QCDOC. Again, this is the easy-to-use kind, very unlike Cell.
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