message size and performance

[arjav_parikh]

I am sure that I am doing something wrong, but it doesn't seem very obvious to me:-)

I am using JBoss 2.4.3 with JBossMQ component. I am sending asynch object messages. In order to check performance of various sizes of the messages, I created following test message

public class TTTestMessage {

private String message;
public TTTestMessage(int size) {
StringBuffer sb = new StringBuffer(size);
for (int i=0;i<size;i++)
sb.append('1');
message = sb.toString()+new java.util.Date();
}

public String toString(){
return message;
}
}

I use
ObjectMessage message = queueSession.createObjectMessage();
TTTestMessage myObjectMsg = new TTTestMessage(1024);
message.setObject(myObjectMsg);

If I use size of 1024 to create a test message it takes longer than that of a message that is created with 2048 or larger size.

Is this the correct way to check performance for different message sizes? Is there any configuration parameter that I should look at?

I worked out an exact cut off number that I pass it to the constructor which is size<=1313 is slower(magnitude of 50 or more) while size>1313 works fast.

Any help is greatly appreciated.

Thanks a bunch.

Best Regards,
arjav