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Subject: Re: [OMPI users] Strange TCP latency results on Amazon EC2
From: Bogdan Costescu (bcostescu_at_[hidden])
Date: 2012-01-13 11:54:34

On Thu, Jan 12, 2012 at 16:10, Jeff Squyres <jsquyres_at_[hidden]> wrote:
> It's very strange to me that Open MPI is getting *better* than raw TCP performance.  I don't have an immediate explanation for that -- if you're using the TCP BTL, then OMPI should be using TCP sockets, just like netpipe and the others.

Could it be that the difference is not in the transfer but in the timing ?