simplebsend.java

MPI for java for Distributed Programming

package mpi.pt2pt; 

import mpi.*;
import java.nio.ByteBuffer ;

public class SimpleBsend {
  static public void main(String[] args) throws MPIException {
  }

  public SimpleBsend() {
  }
  
  public SimpleBsend(String[] args) throws Exception {	  
    
    int len,tsks,me,i,size,rc;	
    final int A1   = 1000;
    Status status;

    MPI.Init(args);
    me=MPI.COMM_WORLD.Rank();  
    size = MPI.COMM_WORLD.Size();

    if(size > 2) {
      if(me == 0)	    
        System.out.println("SimpleBsend: Must run with 2 tasks!");
      MPI.Finalize();	    
      return;
    }

    //System.out.println(MPI.Get_processor_name());
    
    int data1[] = new int[A1];
    int intsize = 4;

//mpi.Buffer buf1 = new mpi.Buffer(MPI.COMM_WORLD.Pack_size( A1, MPI.INT) );  
ByteBuffer buf1 = ByteBuffer.allocateDirect ( 
		MPI.COMM_WORLD.Pack_size(A1, MPI.INT) 
		+ MPI.BSEND_OVERHEAD );
    
    if ( me == 0 ) {   
      for(int j=0 ; j<data1.length ; j++) { 
        data1[j] = j;   	      
      }
      MPI.Buffer_attach(buf1);  
      MPI.COMM_WORLD.Bsend(data1,0,A1,MPI.INT,1,1);
      MPI.Buffer_detach();
    } else if ( me == 1 ) {
      for(int j=0 ; j<data1.length ; j++) { 
        data1[j] = 0;   	      
      }
      MPI.COMM_WORLD.Recv(data1,0,A1,MPI.INT,0,1);
      for(int j=0 ; j<data1.length ; j++) { 
        if(data1[j] != j) { 
	   System.out.println("Error at index "+j+" expected value"+
			   j+"actual value"+data1[j]);
	   break;
	}
      }

    }

    if(me == 1) System.out.println("SimpleBsend TEST COMPLETE"+me);
    MPI.Finalize();
  }
  
}