Profiling Servlets at runtime

Question

Does anyone knows how to use the profiling tool hprof with servlets? We are trying to do some performance analysis and currently don't know how to do it with servlets.
Thanks

Answer 1

Check out JAMon. JAMon was designed to monitor performance of J2EE components such as servlets, jsp's and EJBs, however it can monitor any java code (jdk 1.2 or higher). It is easy to use, fast (i.e. can be used in production where it is most needed), easy to use, free and open source.
It tracks statistics such as hit count, average time, max time, min time, outstanding concurrent requests, average concurrent requests, max concurrent requests, and more. It correlates concurrent requests to execution time to let you see how your system performs under load (i.e. scales).
The API is just 2 methods start() and stop() (it works like a stopwatch), but the start method takes a String that represents what you are timing. This string could represent a servlet, jsp, a JDBC call, or any method call, so it is extremely flexible in what you can time.
All this and you should be able to have it running in a few minutes after downloading.
1) The following link has a sample servlet filter that monitors all servlets and jsp's in a few lines of code.
http://www.javaperformancetuning.com/tools/jamon/#SampleCode
2) To download JAMon (90k) go to
http://www.javaperformancetuning.com/tools/jamon/index.shtml#DownloadingJAMon
3) For other performance related resources go to
http://www.javaperformancetuning.com/resources.shtml
steve - http://www.jamonapi.com