15 Mar
2016
15 Mar
'16
4:21 p.m.
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