Re: [OMPI users] slowdown with infiniband and latest CentOS kernel

[Noam Bernstein]

Thanks to all who answered my question.  The culprit was an interaction between
1.7.3 not supporting mpi_paffinity_alone (which we were using previously) and 
the new 
kernel.  Switching to --bind-to core (actually the environment variable 
OMPI_MCA_hwloc_base_binding_policy=core) fixed the problem.

                                                                                
                Noam

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