Books on Java performance tuning

We usually do a performance research by writing small stop watch and it will log time taken for each business methods. You create stop watch methods something like startWath and stopWatch to start and stop a timer. The performance tuning on web applications vary from server to server since there are some server level tuning also improves your application's performance.

Below are some books which might help you.

Java Performance: The Definitive Guide is a really good book and its quite latest as well - covers G1 GC in depth.

Then there is another book: Java Performance by Charlie Hunt and Binu John even this book is good expecially the java performance troubleshooting guidelines are good.

Thanks,
Ujjwal Soni