penteado@gina-n2:~/mpitest> mpif90 pp_mpi_ex1.f90 -o pp_mpi_ex1.out penteado@gina-n2:~/mpitest> cat nodefile gina-n1 gina-n2 penteado@gina-n2:~/mpitest> mpirun -np 4 -machinefile nodefile ./pp_mpi_ex1.out I am process number 0 Running on processor gina-n2 Number of tasks is 4 Process rank 0 ran on processor gina-n2 Process rank 1 ran on processor gina-n1 Process rank 2 ran on processor gina-n1 Process rank 3 ran on processor gina-n2 penteado@gina-n2:~/mpitest> mpirun -np 17 -machinefile nodefile ./pp_mpi_ex1.out I am process number 0 Running on processor gina-n2 Number of tasks is 17 Process rank 0 ran on processor gina-n2 Process rank 1 ran on processor gina-n1 Process rank 2 ran on processor gina-n1 Process rank 3 ran on processor gina-n2 Process rank 4 ran on processor gina-n1 Process rank 5 ran on processor gina-n2 Process rank 6 ran on processor gina-n1 Process rank 7 ran on processor gina-n2 Process rank 8 ran on processor gina-n1 Process rank 9 ran on processor gina-n2 Process rank 10 ran on processor gina-n1 Process rank 11 ran on processor gina-n2 Process rank 12 ran on processor gina-n1 Process rank 13 ran on processor gina-n2 Process rank 14 ran on processor gina-n1 Process rank 15 ran on processor gina-n2 Process rank 16 ran on processor gina-n1 penteado@gina-n2:~/mpitest>