I am willing to use OpenMPI on Windows for a CFD instead of MPICH2. My solver is developed if Fortran77 and piloted by a C++ interface; the both levels call MPI functions.
So, I installed OpenMPI-1.6.2-x64 on my system and compiled my code successfully. But, at the runtime it crashed.
I reproduced the problem into a small C application calling a Fortran function using MPI_Allreduce; when I removed some aggressive optimization options from the Fortran, it worked:
Optimization: Disable (/Od)
Inline Function Expansion: Any Suitable (/Ob2)
Favor Size or Speed: Favor Fast Code (/Ot)
So, I removed the same options from the Fortran parts of my solver, but it still crashes. I tried some others, but it still continues crashing. Does anybody has an idea? Should I (de)activate some compilation options? Is there some properties to build and link against libmpi_f77.lib?
Thanks for your help.