MPICH

If you want to produce a 32-bit executable

• Fortran-77
/usr/local/mpichn32/bin/mpif77 mpi-code.f
• C
/usr/local/mpichn32/bin/mpicc mpi-code.f
• Fortran 90
/usr/local/mpichn32/bin/mpif90 mpi-code.f

To run the code:

/usr/local/mpichn32/bin/mpirun -np 4 a.out

You can include any of these scripts in your makefile as well.

If you need to produce a 64-bin executable: use the same instructions substituting /usr/local/mpich-1.2.5 for /usr/local/mpichn32

Running Jobs

Serial jobs:

time a.out< input > & output &

Parallel jobs:

1. Define the number of processes your code will utilize:

csh or tcsh shell;

setenv MP_SET_NUMTHREADS 4

sh or bash shell:

MP_SET_NUMTHREADS=4 export MP_SET_NUMTHREADS or OMP_NUM_THREADS=4 export OMP_SET_NUMTHREADS
2. Run code as:
time my-par-code.x < input >& output &