pack.java

MPI for java for Distributed Programming

package mpi.dtyp;
// a test program from MPICH test suite.
/****************************************************************************

 MPI-Java version :
    Sung-Hoon Ko([e-mail])
    Northeast Parallel Architectures Center at Syracuse University
    03/22/98

****************************************************************************/

import mpi.*;
import mpjbuf.BufferFactory ;

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

  public pack() {
  }

  public pack(String[] args) throws Exception {
    
/*
      Check pack/unpack of mixed datatypes.
*/

    final int BUF_SIZE = 100;

    int myrank;
    //byte buffer[] = new byte[BUF_SIZE];
    mpjbuf.Buffer buffer = null; 
    int n[]    = new int[1];
    int size[] = new int[1];
    int src, dest, errcnt, errs;
    double a[] = new double[1];
    double b[] = new double[1];
    int pos;
    int apos[] = new int[1];

    Status status;

    MPI.Init(args);
    myrank = MPI.COMM_WORLD.Rank();
    int tasks = MPI.COMM_WORLD.Size();

    if(tasks > 2) {
      if(myrank == 1) {	    
        System.out.println("pack runs with 2 tasks! ");	    
      }
      MPI.Finalize();
      return;
    }

    src	   = 0;
    dest   = 1;
    
    errcnt = 0;
    if (myrank == src) {
      buffer = new mpjbuf.Buffer(
		    BufferFactory.create(10000 + MPI.SEND_OVERHEAD), 
		    MPI.SEND_OVERHEAD, 10000+MPI.SEND_OVERHEAD ); 
		    //MPI.COMM_WORLD.Pack_size(BUF_SIZE, MPI.INT) );
      pos  = 0;
      n[0] = 10;
      a[0] = 1.1;
      b[0] = 2.2;
      pos = MPI.COMM_WORLD.Pack(n,0,1,MPI.INT,buffer,pos);
      //System.out.println("s(1) -- pos "+pos);
      pos = MPI.COMM_WORLD.Pack(a,0,1,MPI.DOUBLE,buffer,pos);
      //System.out.println("s(2) -- pos "+pos);
      pos = MPI.COMM_WORLD.Pack(b,0,1,MPI.DOUBLE,buffer,pos);
      //System.out.println("s(3) -- pos "+pos);
      apos[0] = pos;
      MPI.COMM_WORLD.Send(apos, 0, 1, MPI.INT, dest, 999);
      MPI.COMM_WORLD.Send(buffer, 0, pos, MPI.PACKED, dest, 99);
      BufferFactory.destroy( buffer.getStaticBuffer()); 
    }
    else {
      buffer = new mpjbuf.Buffer(
		    BufferFactory.create(10000 + MPI.RECV_OVERHEAD), 
		    MPI.RECV_OVERHEAD, 10000+MPI.RECV_OVERHEAD ); 
		    //MPI.COMM_WORLD.Pack_size(BUF_SIZE, MPI.INT) );
      status = MPI.COMM_WORLD.Recv(size, 0, 1, MPI.INT, src, 999);
      status = MPI.COMM_WORLD.Recv(buffer,0,size[0],MPI.PACKED,src,99);
      pos = 0;
      pos = MPI.COMM_WORLD.Unpack(buffer,pos,n,0,1,MPI.INT);
      //System.out.println("r(1) -- pos "+pos);
      pos = MPI.COMM_WORLD.Unpack(buffer,pos,a,0,1,MPI.DOUBLE);
      //System.out.println("r(2) -- pos "+pos);
      pos = MPI.COMM_WORLD.Unpack(buffer,pos,b,0,1,MPI.DOUBLE);
      //System.out.println("r(3) -- pos "+pos);
      
      /* Check results */
      if (n[0] != 10) { 
	errcnt++;
	System.out.println
	  ("Wrong value for n; got "+n[0]+" expected 10");
      }
      if (a[0] != 1.1) { 
	errcnt++;
	System.out.println
	  ("Wrong value for a; got "+a[0]+" expected 1.1");
      }
      if (b[0] != 2.2) { 
	errcnt++;
	System.out.println
	  ("Wrong value for b; got "+b[0]+" expected 2.2");
      }

      BufferFactory.destroy( buffer.getStaticBuffer()); 
    }

    if(myrank == 1)  
    System.out.println("Pack TEST COMPLETE");
    MPI.Finalize();

  }
}