Exercises/Examples

1. An example for communication world http://siber.cankaya.edu.tr/ozdogan/ParallelComputing/cfiles/code1.c code1.

   #include <stdio.h>
   #include <mpi.h>
   int main(int argc, char **argv)
   {
     int my_rank, numprocs;
     MPI_Init(&argc,&argv);
     MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
     MPI_Comm_rank(MPI_COMM_WORLD,&id);
     /*printf("Hello! It is processor %d.\n", id);*/
      if (my_rank == 0)
      {
       printf("Hello! It is processor 0. There are %d processors in this 
                      communication world.\n", numprocs);
       printf ("I am process %i out of %i: Hello world!\n",my_rank, size);
      }
      else
      {
        printf("I am process %i out of %i: Hello world!\n", my_rank, size);
      }
     MPI_Finalize();
     return 0;
   }
   

2. Write a program to send/receive and print out your name and age to each processors. Hints:

   char* my_name = "Cem Ozdogan";
   MPI_Send(&my_name, 11, MPI_CHAR, dest, 2, MPI_COMM_WORLD);
   MPI_Recv(&recv_my_name, 11, MPI_CHAR, 0, 2, MPI_COMM_WORLD, &status);