We have finally completed testing performance effects of the JVM and JBoss bytecode optimizations. We had to dial back the request rate so as not to overrun the systems we were using.
Surprisingly we found that the JVM and the bytecode optimizations had a significant impact on performance. Running on a Linux system, we were able to reduce the response time of an application by up to 36 percent, reduce the virtual memory footprint of the system by up to 35 percent and reduce the in-memory portion by up to 15 percent using bytecode optimizations and the IBM SDK 1.4.0. If you want to read more and also find out how we went about optimizing the bytecode, you can get the document and the script files here at http://www.amitysolutions.com.au/pages/downloads.html#optimizations. Now, we're not claiming that you will achieve this increase for all applications and under all conditions, but it does provide some feel for the magnitude of the changes that might be achieved. Hope it is of use. Jon Barnett
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