[Beowulf] AMD’s Direct Connect Architecture

Keith D. Underwood kdunder at sandia.gov
Wed Jun 30 18:23:50 EDT 2004


On Wed, 2004-06-30 at 14:52, rbw at ahpcrc.org wrote:
> On Mon, 28 Jun 2004 11:52:34 -0700, Greg Lindahl wrote:
> 
> >Red Storm is 1-way nodes.
> 
> Right, but there is room for confusion here because the
> node boards include 4 Opteron processors ... yes, each 
> with their own directly controlled memory ... but intra-
> board accesses will be on a short hyper transport path 
> through the local router.

On Red Storm (as it is being delivered to Sandia), there is no practical
difference between communications on a board and communications off of a
board.  Both go through the NIC/router.  Ok, so going off board could
cost you a few extra nanoseconds of wire delay, but.... 

					Keith

-- 
Keith D. Underwood <kdunder at sandia.gov>


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