(How) does the Java JIT compiler optimize my code?

Question

I\'m writing fairly low level code that must be highly optimized for speed. Every CPU cycle counts. Since the code is in Java I can\'t write as low level as in C for example

Answer 1

How do you test the performance?

Here is a good article:

http://www.ibm.com/developerworks/java/library/j-benchmark1/index.html

http://www.ibm.com/developerworks/java/library/j-benchmark2/index.html

http://ellipticgroup.com/html/benchmarkingArticle.html