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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