Aynchronous and Synchronous communication TCP socket

Question

Hi All,
I have written a client/server test application to test the performance of the java socket library. I tested the application in two scenarios,
1) Asynchronous communication between client and server, client sends data(packet size is 500bytes) without waiting for the server response. I tried to upload 1mb file. The time took was 1.5mb/sec which is reasonable.
2) Synchronous communication between client and server, client sends data (again, packet size is 500bytes) and waits for the server response (all server responds is OK (1 byte data)). The amazing thing in this test was the performance went down drastically!!! it came down to 5-10kb/sec, which is unbelievably nonsense or I am doing something nonsense.
code snippet (server side)
//reading from the socket (tried both buffered and non-buffered )
inputstream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
//writing to the outputstream of the socket (server side)
outstream = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream))
//then flush the data, in case
client side code is very simple,
while(not EOF)
outputstream.write(buffer); //buffer size is 500bytes, as I mentioned above
if(synchronous)
wait for server response, otherwise don't
I don't know why in case of synchronous communication it should bring down the speed so much, may be I am using wrong java classes or java sucks!
I would greatly appreciate any help on this.
Platform used: JDK 1.3.1, WIN2K.

Answer 1

I have to break it up because that's how it's done in the real application. The test application that I have written is just part of the product that I am working on.
To give you the background, we have C++ product where we are porting server side of the whole product to java.
The client(which is written in c++) sends data(which is basically attributes), of size 500bytes in every request. The no. of request depends on how big the model(3D Model) is. In case of very huge models (will have MBs of attributes) the client takes long time to send all the attributes, which is the case with java server (client still in c++). But the in case c++ server it doesn't make any difference, the data transfer rate is same no matter how big the model is.
I know if I increase the size of the packet I will get higher performance, but unfortunately I can't do that. That's how the client is designed to do it.
thanks,
Ganesh