buffertest7.java

MPI for java for Distributed Programming

package mpjdev.buffertest;

import mpjdev.*;
import mpjbuf.*;

/**
 * This checks the gathering/scattering of the Java objects.
 */
public class BufferTest7 {
  public static void main(String args[]) throws Exception {
  }

  public BufferTest7() {
  }

  public BufferTest7(String[] args) throws Exception {
	  
    String[] nargs = new String[args.length+1];	  
    System.arraycopy(args,0,nargs,0,args.length);
    nargs[args.length] = this.toString();	  
    MPJDev.init(args);

    int indexes[] = {
        2, 4, 6, 8, 12, 14, 16, 18, 22, 24, 26, 28, 32, 34, 36, 38, 42, 44, 46,
        48, 52, 54, 56, 58,
        62, 64, 66, 68, 72, 74, 76, 78, 82, 84, 86, 88, 92, 94, 96, 98};

    int id = MPJDev.WORLD.id();
    int size = MPJDev.WORLD.size();

    if(size > 2) {
      if(id == 1)
        System.out.println("BufferTest7: Must run with 2 tasks!");      
      MPJDev.finish();
      return;
    }

    int SEND_OVERHEAD = MPJDev.getSendOverhead() ;
    int RECV_OVERHEAD = MPJDev.getRecvOverhead() ; 

    java.util.Vector vector1 = null;
    java.util.Vector vector = new java.util.Vector();

    for (int k = 0; k < 10; k++) {
      vector.add("" + k);
    }
    if (MPJDev.WORLD.id() == 0) {

      Object[] source = new Object[100];

      for (int k = 0; k < source.length; k++) {
        source[k] = vector;
      }

      Buffer writeBuffer = new Buffer( 
                 BufferFactory.create(8 + SEND_OVERHEAD),
		 SEND_OVERHEAD, 8+ SEND_OVERHEAD );

      writeBuffer.putSectionHeader(Type.OBJECT);
      writeBuffer.gather(source, 40, 0, indexes);
      writeBuffer.commit();
      MPJDev.WORLD.send(writeBuffer, 1, 992, true);
      //System.out.println("Send Completed");
      writeBuffer.clear();

      BufferFactory.destroy(writeBuffer.getStaticBuffer() );
    
    }
    else if (MPJDev.WORLD.id() == 1) {

      Buffer readBuffer = new Buffer(
                 BufferFactory.create(8 + RECV_OVERHEAD),
		 RECV_OVERHEAD, 8+ RECV_OVERHEAD );
      
      Object[] source = new Object[100];

      for (int k = 0; k < source.length; k++) {
        source[k] = null;
      }

      MPJDev.WORLD.recv(readBuffer, 0, 992, true);
      readBuffer.commit();
      readBuffer.getSectionHeader();
      int els = readBuffer.getSectionSize();
      
      //System.out.println(" els " + els);

      try {
        readBuffer.scatter(source, 40, 0, indexes);
        //System.out.println("Receive Completed ");
      }
      catch (Exception e) {
        e.printStackTrace();
      }

      BufferFactory.destroy(readBuffer.getStaticBuffer() );
      
      System.out.println("BufferTest7 TEST Completed (?)");
/*
      for (int j = 0; j < source.length; j++) {
        System.out.println("source[" + j + "] :: " + source[j]);
      }
*/      

    } 
    
    //This should be the last call, in order to finish the communication
 //try {   MPJDev.WORLD.barrier(); }catch(Exception e){}
    MPJDev.finish();
  }
}