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From: George Bosilca (bosilca_at_[hidden])
Date: 2006-12-15 16:05:09


Doug,

Thanks for the graph. I was wondering how do we compare with the
others MPI implementations. If you have others MPI installed on your
cluster can you do the same measurements with them and augment your
graph with the results ?

   Thanks,
     george.

On Dec 15, 2006, at 3:03 PM, Doug Gregor wrote:

> Hi all,
>
> While doing some benchmarking with derived data types, I found that
> the prerelease Open MPI 1.2 is giving *much* better performance than
> Open MPI 1.1. My simple benchmark is a modified NetPIPE that sends/
> receives data via a derived data type build with MPI_Contiguous(1,
> MPI_BYTE, ...) rather than MPI_BYTE. With Open MPI 1.1, this killed
> performance; with Open MPI 1.2, it had essentially no performance
> impact. Here's the NetPIPE chart, for reference:
>
> http://www.generic-programming.org/~dgregor/images/blog/netpipe-
> ompi.png
>
> This message was originally going to point out the performance issues
> with Open MPI 1.1, but instead I'll just say "Keep up the good work!"
>
> Cheers,
> Doug "even-if-I-were-objective-Open MPI-would-be-better" Gregor
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