How to make an application scalable?

Hello,
Few years ago I have written a java application (J2SE) used to translate some requets from one protocol to another one (propriétary protocols). At that time, this applicaiton has been designed to process about 1000 requests per day.
Now we would like to use it to process 100 times more requests per day but in this case the application becomes too slow.
I'm wondering if there is any techniques that would allow me to dynamically start multiple instances of my application to process these requests faster in case of overload.
Does such mechanism exists with J2RE?
If yes, can you please give me some details about it?
Thanks in advance.
Remi.

Philipina wrote:
Hello,
Few years ago I have written a java application (J2SE) used to translate some requets from one protocol to another one (propriétary protocols). At that time, this applicaiton has been designed to process about 1000 requests per day.That's about one request every 29 seconds in an 8 hour day.
Now we would like to use it to process 100 times more requests per day but in this case the application becomes too slow.That's about four requests per second. A typical Java application should be able to handle up to 500 - 2000 requests/second if it is not waiting for IO, network or a database. (One or all of these could be your problem)
I'm wondering if there is any techniques that would allow me to dynamically start multiple instances of my application to process these requests faster in case of overload.I think you should find out why your request processing is so slow. Have you tried profiling your application? If it is CPU bound, this should help significantly. If it is IO/network bound it is worth understanding what it is spending its time waiting on.
Does such mechanism exists with J2RE?You cannot use more that 100% of your CPU so creating more processes at this point won't help. If you are IO bound, more thread won't help either. If you are network bound, more threads can help, but fixing the network/remote service would be a better solution.
You need to understand what is making your application too slow and fix it or tune for that problem specificity. Adding more and more threads doesn't always make a program go faster.

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