Re: [OMPI users] EXTERNAL: Re: How could OpenMPI (or MVAPICH) affect floating-point results?

[Eugene Loh]

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.