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Subject: Re: [OMPI users] EXTERNAL: Re: How could OpenMPI (or MVAPICH) affect floating-point results?
From: Eugene Loh (eugene.loh_at_[hidden])
Date: 2011-09-20 11:07:36


I've not been following closely. How do you know you're using the
identical compilation flags? Are you saying you specify the same flags
to "mpicc" (or whatever) or are you confirming that the back-end
compiler is seeing the same flags? The MPI compiler wrapper (mpicc, et
al.) can add flags. E.g., as I remember it, "mpicc" with no flags means
no optimization with OMPI but with optimization for MVAPICH.

On 9/20/2011 7:50 AM, Blosch, Edwin L wrote:
> - It was exact same compiler, with identical compilation flags.