On Feb 21, 2010, at 10:25 AM, Rodolfo Chua wrote: > I used openMPI compiled with the GNU (gcc) compiler to run GULP code in > parallel. > But when I try to input "mpirun -np 2 gulp <input>", GULP did not run in two > processors. Can you give me any suggestion on how to compile GULP code > exactly with openMPI. > > Below is the instruction from GULP code manual. > "If you wish to run the program in parallel using MPI then you will need to > alter > the file "getmachine" accordingly. The usual changes would be to add the > "-DMPI" > option and in some cases change the compiler name (for example > tompif77/mpif90) > or include the MPI libraries in the link stage."
I'm afraid that I don't know the GULP code in particular, but their advice is sound: adding -DMPI sounds like something specific to their code (e.g., to activate the MPI code sections). But using mpif77 / mpif90 as your compiler name in their build process is probably the Right thing to do (e.g., instead of ifort / gfortran / pgf77 / whatever). This should build their executable with Open MPI's support libraries linked in, etc. -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
