[Mpi-forum] MPI One-Sided Communication

Greg Lindahl lindahl at pbm.com
Fri Apr 24 19:18:27 CDT 2009

On Fri, Apr 24, 2009 at 05:50:23PM -0400, Vinod Tipparaju wrote:

> The scaling in the chart discussed below is immaterial because the
> comparision point is flawed. I tried to convey this to some of the
> developers on the phone a couple of years ago but invain. The fact
> this claim of performance went no where beyond the white paper
> should convey something. Did you know dft (siosi6) doesn't scale
> (for various reasons) beyond 1k? 

Pretty much every code and dataset have a maximum scalability point. I
don't see what that has to do with anything.

The point of the chart is that a pure MPI-1 implementation scaled
great and had great absolute performance on particular hardware/MPI,
even though the developers were sure that specialized hardware &
non-MPI underlying messaging software was needed.

-- greg

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