Hessian Serialization Performance...

 
Hi,
 
   Currently , we are developping an enterprise application that would
have nearly 5000 clients.Since our application requires complicated
screen , we choose swing , rich client approach.
   Our EJB's are stateless, and we are using Toplink as persistence
engine. Swing clients communicates with EJB's via RMI. As known by
everybody, java default serialization mechanism is both
    space and cpu consuming. For example , one of our most used domain
object , when it is serialized it takes about 25-40 kb. Our client's
network bandwidth is limited. Therefore , I have tried to find another
solution . instead of java default serialization. I have found Hessian
protocol. It was very promising, I have thought but my problem had been
solved. But after a simle test, it seems that Hessian protocol is worse
than default serialization mechanism. Hessian serialization creates
50-70 kb file for our most used domain object. For a simle domain object
like ProcolTest.TestData, it creates smaller file than default
serialization, the ratio is about 2.5. But when we increase number of
serialization , the performance of Hessian degrades comparing to default
.
 
These are the test results.
 
Number Of Iteration Hessian (ms) Default (ms)
100 15 63
1000 160 160
10000 875 532
50000 3860 2093
100000 7687 4032
 
The results for our complex domain object are worse ;
Number Of Iteration Hessian (ms) Default (ms)
 10 265 110
100 1500 516
1000 13140 4360
 
 
 
Could somebody explain why hessian serialization performance is worse? .
Is there anything wrong with my testcase?
 
Thanks in Advance...
 
Gursel Koca
 
 
 
Here is the test code,
 
public class ProtocolTest {
    public static class TestData implements Serializable {
       Long longField = new Long(10000);
       Date dateField=new Date(System.currentTimeMillis());
       String stringField = "Test String";
       Double doubleField = new Double(2.334);
     }
 
    
  public void performanceTestOfSerializationWithSimpleObject() {
      try {
          int len = 1000;
         ByteArrayOutputStream barr = new ByteArrayOutputStream();
          ByteArrayOutputStream barr2 = new ByteArrayOutputStream();
          TestData newIsemriPstn = new TestData();
          ObjectOutputStream oout = new ObjectOutputStream(barr);
          HessianOutput hout = new HessianOutput(barr2);
          long begin = System.currentTimeMillis();
          for (int i = 0; i < len; i++) {
              oout.writeObject(newIsemriPstn);
              barr = new ByteArrayOutputStream();
              oout = new ObjectOutputStream(barr);
          }
          long end = System.currentTimeMillis();
          System.out.println("Default Serialization takes
"+(end-begin));
          begin = end;
          for (int i = 0; i < len; i++) {
             hout.writeObject(newIsemriPstn);
             barr2= new ByteArrayOutputStream();
              hout = new HessianOutput(barr2);
         }
         end = System.currentTimeMillis();
         System.out.println("Hessian Serialization takes "+(end-begin));
      }
      catch (Exception ex) {
          ex.printStackTrace();
        
      }
  }
 
   public static void main(String[] args) {
        new
ProtocolTest().performanceTestOfSerializationWithSimpleObject();
    }
}
 
 
    
 

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Received on Mon 02 May 2005 10:09:05 -0700