[Beowulf] Re: Re: Home beowulf - NIC latencies

[Patrick Geoffray]

Rossen Dimitrov wrote:

> Patrick, this is quite a broad statement. 4 years ago we had a paper 
> arguing that MPI's written to support many different interconnects and 
> messaging technologies through internal portability layers were probably 
> sub-optimal for at least some of the interconnects. Most of the reasons 

Yes, it's very logical. See my reply to Joachim, I don't critic the 
existence of SAK implementations (actually, yes, a little), all 
commercial implementations are essentially swiss-army-knives, they have 
to. My problem is to use results from one unique MPI implementations to 
connect dots at the hardware level. You don't know if the dots are from 
the MPI or the hardware, or both.

Patrick
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Patrick Geoffray
Myricom, Inc.
http://www.myri.com