C + c++ / Java POFReader inconsistancies

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• Performance consistency POF vs Java Seriailization...

  Hello
  I tried to compare the performance of Java vs consistency POF serialization so I wrote some examples of classes in order to compare the time taken to serialize and the size of the byte array created to contain the serialized bits. I found that the simple objects Java serialization has given the better results than the POF. I write the code online. Can you get it someone please let me know if the comments are correct or if a different approach should be taken for POF serialization?
  
  Thank you.
  Raphy
  
  
  These are the statistics kept for 1000 serialization of objects...
  
  time to serialize an object in nano seconds 9744954 Java
  
  time for pof serialization of an object in nano seconds 64662544
  
  Total time required for java serialization of objects 1000 in nano seconds 57661927
  
  Total time required for pof serialization of objects 1000 in nano seconds 90891948
  
  Size of table of the total number of bytes for java serialization is 403890
  Size of table of the total number of bytes for the serialization of pof is 1029000
  
  The code is pasted below...
  
  serializable Java object
  package com.apx.core.test.serialization;
  
  import java.io.Serializable;
  import java.util.Date;
  
  / public class JavaSerializable implements Serializable {}
  
  private String name;
  Field1 double private;
  Field2 long private;
  field3 Double private;
  Field4 Long private;
  private Date dateField;
  
  public String getName() {}
  return the name.
  }
  public void setName (String name) {}
  myIdName = name;
  }
  {} public double getField1()
  return of field1;
  }
  public void setField1 (double Field1) {}
  This.Field1 = field1;
  }
  {} public long getField2()
  return Field2;
  }
  public void setField2 (long Field2) {}
  This.Field2 = Field2;
  }
  {} public Double getField3()
  return of field3;
  }
  public void setField3 (Double field3) {}
  This.field3 = field3;
  }
  {} public Long getField4()
  return of field4;
  }
  public void setField4 (Long field4) {}
  This.Field4 = field4;
  }
  public Date getDateField() {}
  return dateField;
  }
  {} public void setDateField (Date dateField)
  this.dateField = dateField;
  }
  
  }
  
  Object serializable POF
  package com.apx.core.test.serialization;
  
  import java.io.IOException;
  import java.util.Date;
  
  import com.tangosol.io.pof.PofReader;
  import com.tangosol.io.pof.PofWriter;
  import com.tangosol.io.pof.PortableObject;
  
  / public class POFSerializable implements PortableObject {}
  public static final int TYPE_ID = 100;
  
  private String name;
  Field1 double private;
  Field2 long private;
  field3 Double private;
  Field4 Long private;
  private Date dateField;
  
  public String getName() {}
  return the name.
  }
  public void setName (String name) {}
  myIdName = name;
  }
  {} public double getField1()
  return of field1;
  }
  public void setField1 (double Field1) {}
  This.Field1 = field1;
  }
  {} public long getField2()
  return Field2;
  }
  public void setField2 (long Field2) {}
  This.Field2 = Field2;
  }
  {} public Double getField3()
  return of field3;
  }
  public void setField3 (Double field3) {}
  This.field3 = field3;
  }
  {} public Long getField4()
  return of field4;
  }
  public void setField4 (Long field4) {}
  This.Field4 = field4;
  }
  public Date getDateField() {}
  return dateField;
  }
  {} public void setDateField (Date dateField)
  this.dateField = dateField;
  }
  
  
  @Override
  public String toString() {}
  Return "POFSerializable [dateField =" dateField + ', Field1 =' + field1
  + ', Field2 =' + Field2 + ', field3 =' + field3 + ', field4 ='
  field4 + ', name =' + name + '] ';
  }
  
  @Override
  Public Sub readExternal (PofReader arg0) throws IOException {}
  myIdName = arg0.readString (0);
  This.Field1 = arg0.readDouble (1);
  This.Field2 = arg0.readLong (2);
  This.field3 = arg0.readDouble (3);
  This.Field4 = arg0.readLong (4);
  this.dateField = arg0.readDate (5);
  
  
  }
  
  @Override
  Public Sub writeExternal (PofWriter arg0) throws IOException {}
  arg0. WriteString (0, myIdName);
  arg0.writeDouble (1, this.field1);
  arg0.writeLong (2, this.field2);
  arg0.writeDouble (3, this.field3);
  arg0.writeLong (4, this.field4);
  arg0.writeDate (5, this.dateField);
  
  }
  
  }
  
  The tester of serialization class
  package com.apx.core.test.serialization;
  
  import java.io.ByteArrayOutputStream.
  import java.io.IOException;
  import java.io.ObjectOutputStream;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  
  import com.tangosol.io.ByteArrayReadBuffer;
  import com.tangosol.io.ByteArrayWriteBuffer;
  import com.tangosol.io.ReadBuffer.BufferInput;
  import com.tangosol.io.WriteBuffer.BufferOutput;
  import com.tangosol.io.pof.PortableObjectSerializer;
  import com.tangosol.io.pof.SimplePofContext;
  
  public class SerializationTester {}
  Private Shared SimplePofContext pofContext = new SimplePofContext();
  
  {public static
  pofContext.registerUserType (POFSerializable.TYPE_ID, POFSerializable.class,
  new PortableObjectSerializer (POFSerializable.TYPE_ID));
  
  }
  
  private list < JavaSerializable > javaSerialList = new ArrayList < JavaSerializable > ();
  private list < POFSerializable > pofSerialList = new ArrayList < POFSerializable > ();
  
  Public Shared Sub pofSerializeObject (exit BufferOutput, Object o) throws IOException
  {
  pofContext.serialize (output, o);
  }
  
  public static Object deserializePofObject (in BufferInput) throws IOException
  {
  Return (in) pofContext.deserialize;
  }
  
  public SerializationTester() {}
  
  for (int i = 0; i < 1000; ++ i)
  {
  Serializable JavaSerializable = new JavaSerializable();
  POFSerializable pofSerializable = new POFSerializable();
  javaSerialList.add (serializable);
  pofSerialList.add (pofSerializable);
  initialize the java serializable objects...
  serializable.setName ("Name" + i);
  serializable.setField1 (Double.MAX_VALUE);
  serializable.setField2 (Long.MAX_VALUE);
  serializable.setField3 (Double.MAX_VALUE);
  serializable.setField4 (Long.MAX_VALUE);
  serializable.setDateField (new Date());
  
  initialize the POF serializable objects...
  pofSerializable.setName ("Name" + i);
  pofSerializable.setField1 (Double.MAX_VALUE);
  pofSerializable.setField2 (Long.MAX_VALUE);
  pofSerializable.setField3 (Double.MAX_VALUE);
  pofSerializable.setField4 (Long.MAX_VALUE);
  pofSerializable.setDateField (new Date());
  }
  
  }
  
  Public Sub getJavaSerializationStats() throws Exception
  {
  List of < byte [] > objectSizes = new ArrayList < byte [] > ();
  long totalTime = 0;
  
  int count = 0;
  for (instance of JavaSerializable: javaSerialList)
  {
  
  long beginTime = System.nanoTime ();
  Byte [] objectBits = serializeObject (instance);
  long finishTime = System.nanoTime ();
  totalTime += (finishTime - beginTime);
  objectSizes.add (objectBits);
  if(Count==0)
  {
  System.out.println ("time to serialize an object in nano seconds of java" + (finishTime - beginTime));
  }
  ++ count;
  }
  System.out.println ("Time taken to java serialization of objects 1000 in nano seconds Total" + (totalTime));
  totalLength length = 0;
  for (byte [] bs: objectSizes) {}
  totalLength += bs.length;
  }
  System.out.println ("size of table of the Total number of bytes for a serialization java is" + totalLength);
  }
  
  Public Sub getPOFSerializationStats() throws IOException
  {
  List of < byte [] > objectSizes = new ArrayList < byte [] > ();
  long totalTime = 0;
  
  int count = 0;
  BufferWriter ByteArrayWriteBuffer = new ByteArrayWriteBuffer (1);
  for (instance of POFSerializable: pofSerialList)
  {
  
  long beginTime = System.nanoTime ();
  pofSerializeObject (bufferWriter.getBufferOutput (), for example);
  long finishTime = System.nanoTime ();
  totalTime += (finishTime - beginTime);
  
  objectSizes.add (bufferWriter.getRawByteArray ());
  
  if(Count==0)
  {
  System.out.println ("TimeFor pof serialization of an object in nano seconds" + (finishTime - beginTime));
  }
  ++ count;
  }
  
  System.out.println ("Time taken to pof serialization of objects 1000 in nano seconds Total" + (totalTime));
  now read the objects to return...
  totalLength length = 0;
  for (byte [] bs: objectSizes) {}
  
  totalLength += bs.length;
  ByteArrayReadBuffer readBuffer = new ByteArrayReadBuffer (bs);
  Object obj = deserializePofObject (readBuffer.getBufferInput ());
  System.out.println (obj);
  }
  System.out.println ("table size to the Total number of bytes for the serialization of pof is" + totalLength);
  }
  
  Public Shared Sub main (String [] args) throws exceptions
  {
  Tester SerializationTester = new SerializationTester();
  tester.getJavaSerializationStats ();
  tester.getPOFSerializationStats ();
  
  }
  
  private byte [] serializeObject (Object, object) {}
  try {}
  ByteArrayOutputStream Bos = new ByteArrayOutputStream();
  ObjectOutputStream out = new ObjectOutputStream (bos);
  out.writeObject (object);
  out. Close();
  
  message from Byte [] = bos.toByteArray ();
  return the message;
  } catch (IOException e) {}
  throw new RuntimeException (e);
  }
  }
  
  
  }
  
  Published by: user10928746 on March 23, 2009 15:33

  Hi Raphy,

  You should not use the getRawByteArray method, first because it is private to the buffer, secondly because it returns an array that is greater than the actually used amount of bytes. Similar in internal table of a StringBuffer, while toByteArray is similar to a new string with a correct internal character array returned by the toString method of the StringBuffer.

  Instead, you must use the toByteArray method which returns an array of bytes which is only as long as necessary, so the length is correct.

  In addition, I would take your time with a grain of salt values you POF serialization at an unfair disadvantage because it always starts with a byte of an array, and must reassign, possibly several times. Coherence itself collects the stats of the objects it serializes and pré-alloue a buffer that is probably wide enough so that no reallocation will be necessary.

  Also, you collect a large memory footprint by running your code in a loop and maintaining arrays of bytes that could lead to global catalogs that may influence the outcome of your time, more clearly that you have more objects, and part of your test POF has more objects because all Java serialized objects are always kept in a Member If your test is again a bias against the POF.

  Best regards

  Robert

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