group_diff.java

MPI for java for Distributed Programming

package mpi.group;

import mpjdev.*;
import mpjbuf.*;
import mpi.*;
import java.util.Arrays;

public class Group_diff {

  public static void main(String args[]) throws Exception{
  }

  public Group_diff() {
  }

  public Group_diff(String[] args) throws Exception {
    MPI.Init(args);		
    mpi.Group grp = MPI.COMM_WORLD.Group();		
    int me = grp.Rank();
    int tasks = grp.Size(); 
    
    if(tasks < 8) {
      if(me == 0) 
        System.out.println("group->Group_diff: MUST RUN with 8 tasks");
      MPI.COMM_WORLD.Barrier();
      MPI.Finalize();
      return;
    }

    int[] incl1 = {4,0,5,6};
    int[] incl2 = {6,7,4};
    mpi.Group grp1 = grp.Incl(incl1);		
    mpi.Group grp2 = grp.Incl(incl2);
    mpi.Group grp3 = null;
    grp3 = mpi.Group.Difference(grp1,grp2); 

    if(grp3.Size() != 2) {
      System.out.println(" Error(1): ...."); 	    
    }
    
    MPI.COMM_WORLD.Barrier();   

    if(me == 0) 
      System.out.println("Group_diff TEST COMPLETED");


    MPI.Finalize();	
  }
}