Hi Bryan

I have seen similar issues on LANL clusters when message sizes were fairly large. How big are your buffers when you call Allreduce? Can you send us your Allreduce call params (e.g., the reduce operation, datatype, num elements)?

If you don't want to send that to the list, you can send it to me at LANL.

Thanks
Ralph



On May 11, 2009, at 7:29 PM, Bryan Lally wrote:

Eugene Loh wrote:

Another user reports something somewhat similar at http://www.open-mpi.org/community/lists/users/2009/04/9154.php . That problem seems to be associated with GCC 4.4.0. What compiler are you using?

OMPI was built with gcc v4.3.0, which is what's packaged with Fedora 9. The application code was built with that and NAG's fortran, and in another test with Pathscale's C and Fortran. We're only using the C bindings to OMPI, never the Fortran bindings.

        - Bryan

--
Bryan Lally, la...@lanl.gov
505.667.9954
CCS-2
Los Alamos National Laboratory
Los Alamos, New Mexico
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