[Beowulf] Cheap SDR IB

Bill Broadley bill at cse.ucdavis.edu
Wed Jan 30 14:43:03 PST 2008

Jeffrey B. Layton wrote:
> Just in case you've missed the announcements:
> http://www.clustermonkey.net//content/view/222/1/

Interesting that Infiniband is getting down close to the predicted $100 per
HCA price.  Certainly $250 per node (HCA, cable, and switch) for 24 ports
makes it easier to justify if the performance is there.  So of course that
begs the question, what is the performance?

I noticed that the price is for the InfiniHost III Lx, does anyone know if the
Ex (mentioned in the performance table) and Lx (mentioned in the price list) 
perform identically?  Or any of the standard numbers for MPI latency
and/or bandwidth for the Lx part?

I googled around and found a few PDFs, but no real numbers.  Some EE magazine 
mentioned 4us roughly, but it wasn't clear exactly what they were measuring.

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