[Boost-users] boost-mpi - Serious performance degradation with OpenMPI 1.10.1

Subject: [Boost-users] boost-mpi - Serious performance degradation with OpenMPI 1.10.1
From: Nolen, Steven Douglas (drnuke_at_[hidden])
Date: 2016-03-15 12:21:38

My project has been using boost's mpi interface for a number of years and have recently encountered a significant performance obstacle moving to openmpi 1.10.1. We are seeing a factor of 7-10x slowdown in the communication portion of our calculation. Our communication patterns are mostly governed by all-to-one reductions and some all-to-all reductions. Colleagues who call mpi directly have not seen this behavior.

We would be willing to work with someone to find a solution.

Steve Nolen
LANL