which tool should be used in order to measure performance of a program unit?

i need 开发者_如何学Cto measure performance of my program unit. I am using hibernate as ORM tool. i want a tool that is capable enough to measure the time taken per method invoked and excluding the database loads???

Please help

This is what a profiler does. VisualVM is a free one, but if you want mroe detail as to the timings and behaviour of JDBC queries I suggest you look at YourKit which can anlyse the queries in more depth.

JConsole is a graphical monitoring tool to monitor the Java Virtual Machine and java applications both on a local or remote machine. http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html

for a quick and dirty hack, you can use http://www.clarkware.com/software/JUnitPerf.html, a junit based microbenchmark framework. You can write your code, mock out (or even use a real database), and run it to get a benchmark. This benchmark is essentially good only for testing a single (or very few) methods, and in their specific uses, not a general profiler.

Your question isn't quite clear to me. Do you wonder which part of your application takes the time? Or do you want to observe the time a certain part of your code takes. In the first case use a proper file. VisualVM and YourKit are both fine profilers, I've used them before and found them very helpfull. In the latter case, I would try a tool like Perf4J which allows you to annotate a method and observe its average runtime, its standard deviation and other thing in realtime or afterwards.