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December 16, 2013 02:29
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taken from : http://mpitutorial.com
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// Author: Wes Kendall | |
// Copyright 2011 www.mpitutorial.com | |
// This code is provided freely with the tutorials on mpitutorial.com. Feel | |
// free to modify it for your own use. Any distribution of the code must | |
// either provide a link to www.mpitutorial.com or keep this header in tact. | |
// | |
// An intro MPI hello world program that uses MPI_Init, MPI_Comm_size, | |
// MPI_Comm_rank, MPI_Finalize, and MPI_Get_processor_name. | |
// | |
#include <mpi.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
int main(int argc, char** argv) { | |
// Initialize the MPI environment. The two arguments to MPI Init are not | |
// currently used by MPI implementations, but are there in case future | |
// implementations might need the arguments. | |
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); | |
// Print off a hello world message | |
printf("Hello world from processor %s, rank %d out of %d processors\n", | |
processor_name, world_rank, world_size); | |
// Finalize the MPI environment. No more MPI calls can be made after this | |
MPI_Finalize(); | |
} |
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