MPI code compilation and run

  • MPI code can be compiled with command mpicc 
    mpicc -o code.x code.c

  • Executable code.x should be started by command mpirun: 
    mpirun -np Nproc  -machinefile machines code.x
    Where Nproc the number of processes involved; machines is a file with the list of hosts participated into MPI
    For example, to run the code on two single CPU nodes, unisys18 and node18, file machines looks as follows: 
    unisys18
node18

    To start the code in this case: 
    mpirun -np 2 -machinefile machines code.x
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