mpi_hello_world.c
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	#include <mpi.h>
	#include <stdio.h>
	#include "getcpuid.h"

	int main(int argc, char** argv) {
	// Initialize the MPI environment
	MPI_Init(NULL, NULL);

	// Get the number of processes
	int world_size;
	MPI_Comm_size(MPI_COMM_WORLD, &world_size);

	// Get the rank of the process
	int world_rank;
	MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

	// Get the name of the processor
	char processor_name[MPI_MAX_PROCESSOR_NAME];
	int name_len;
	MPI_Get_processor_name(processor_name, &name_len);

	// get CPU id used by the process
	int cpu_id = get_cpu_id();

	// Print off a hello world message
	printf("Hello world from host %s core %d, processor rank %d"
	" out of %d processors\n", processor_name, cpu_id,
	world_rank, world_size);

	// Finalize the MPI environment.
	MPI_Finalize();
	}