Hello World with MPI

mpi_HelloWorld.c

/*
* compile with : mpicc -o helloworld mpi_HelloWorld.c
* run with mpirun -np [#Number of Cores] helloworld 
*/

#include <stdio.h>
#include "mpi.h"

int main(int argc,char **argv){
int rank,size;
	MPI_Init(&argc,&argv);
	MPI_Comm_size(MPI_COMM_WORLD,&size);
	MPI_Comm_rank(MPI_COMM_WORLD,&rank);
	printf("Hello world from process %d od %d\n",rank,size);
	MPI_Finalize();
	return 0;
}