Remark about Open MPI in OS X
Open MPI v1.2.3 was included in OS X starting with version 10.5 (Leopard). Note that the Leopard does not include a Fortran compiler, so the OS X-shipped version of Open MPI does not include Fortran support.
If you need/want Fortran support, you will need to build your own copy of Open MPI (assumedly when you have a Fortran compiler installed). The Open MPI team strongly recomends not overwriting the OS X-installed version of Open MPI, but rather installing it somewhere else (e.g., /opt/openmpi). http://www.open-mpi.org/faq/?catego...
What did I do to compile openmpi on my machine ?
Get the tarball of openmpi here:
Expand the tarball in a temporary directory
Launch the configuration setup
./configure FC=gfortran --prefix=/opt/openmpi CFLAGS=-m64 CXXFLAGS=-m64 FFLAGS=-m64 FCFLAGS=-m64
sudo make all install
How do I compile and run MPI fortran programs See example attached to this document.
Compile with the compilator /opt/openmpi/bin/mpif90
Do not forget to compile the code with -m64 flag
/opt/openmpi/bin/mpirun -np #proc
or define an alias