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Subject: Re: [OMPI users] slowdown with infiniband and latest CentOS kernel
From: Noam Bernstein (noam.bernstein_at_[hidden])
Date: 2013-12-18 10:19:25

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.


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