buffertest8.java

MPI for java for Distributed Programming

package mpjdev.buffertest;

import mpjdev.*;
import mpjbuf.*;

/**
 * This checks the gathering/scattering of the Java objects.
 * Doesn't work at the moment
 */
public class BufferTest8 {
  public static void main(String args[]) throws Exception {
  }
  public BufferTest8() {
  }

  public BufferTest8(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};
    //the first call will always be init()   
    
    int id = MPJDev.WORLD.id();
    int size = MPJDev.WORLD.size();

    if(size > 2) {
      if(id == 1)
        System.out.println("BufferTest8: Must run with 2 tasks!");      
      //MPJDev.WORLD.barrier();
      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();
    vector.add("1");
    vector.add("2");

    if (MPJDev.WORLD.id() == 0) {
      Object[] source = new Object[100];
      for (int j = 0; j < source.length; j++) {
        source[j] = vector;
      }
      Buffer writeBuffer = new Buffer(
                   BufferFactory.create(8 + SEND_OVERHEAD),
		   SEND_OVERHEAD, 8+ SEND_OVERHEAD );
      
      writeBuffer.putSectionHeader(Type.OBJECT);
      writeBuffer.strGather(source, 0, 2, 0, 2, indexes);
      writeBuffer.commit(); 
      //try { Thread.currentThread().sleep(100); }catch(Exception e){}
      MPJDev.WORLD.send(writeBuffer, 1, 992, true);
      BufferFactory.destroy(writeBuffer.getStaticBuffer() );
      //System.out.println("Send Completed \n");
    }
    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 j = 0; j < source.length; j++) {
        source[j] = null;
      }

      MPJDev.WORLD.recv(readBuffer, 0, 992, true);
      readBuffer.commit();
      readBuffer.getSectionHeader();
      int r = readBuffer.getSectionSize() ;
      try {
        readBuffer.strScatter(source, 0, 2, 0, 2, indexes);
      }
      catch (Exception e) {
        e.printStackTrace();
      }
      
      BufferFactory.destroy(readBuffer.getStaticBuffer() );
/*
      for (int j = 0; j < source.length; j++) {
        System.out.print("\t source[" + j + "] :: " + source[j]);
      }
*/   
      System.out.println("BufferTest8 TEST Completed (?)");
    } 

   // MPJDev.WORLD.barrier();
    MPJDev.finish();
  }
}