#include #include int main (int argc, char** args) { int size; int myrank; MPI_Init(&argc, &args); MPI_Comm_size(MPI_COMM_WORLD, &size); MPI_Comm_rank(MPI_COMM_WORLD, &myrank); printf("Hello world, I have rank %d out of %d.\n", myrank, size); MPI_Finalize(); return 0; }