group_self.java

MPI for java for Distributed Programming

package mpi.group;

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

public class Group_self {

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

  public Group_self() {
  }

  public Group_self(String[] args) throws Exception {
    MPI.Init(args);		
    mpi.Group grp = MPI.COMM_WORLD.Group();
    int me = grp.Rank(); 
    int tasks = grp.Size();
    int data[] = new int [10];
    int rdata[] = new int [10];
    int src_dest = 0;
    int tag = 10;
    
    for(int i=0 ; i<data.length ; i++) {
      data[i] = i; 	    
    }
    
    mpi.Request req = MPI.COMM_SELF.Isend(data,0,10,MPI.INT,src_dest,tag );
    MPI.COMM_SELF.Recv(rdata,0,10,MPI.INT,src_dest,tag);
    req.Wait() ;

    for(int i=0 ; i<rdata.length ; i++) {
      if(rdata[i] != i) {
        System.out.println("Error at index "+i+": it is "+data[i]+"while "+ 
			"we are expecting "+i);
	break ;
      }
    }

    MPI.COMM_WORLD.Barrier();
    if(me == 0) 
      System.out.println("Group_self TEST COMPLETED"); 	    
   

    MPI.Finalize();
  }
  
}