The document is a summary of a presentation about Java performance led by Richard Warburton and Martijn Verburg, addressing key questions that Java developers have regarding code optimization and performance tuning. Topics include JVM optimization, garbage collection logging, and common mistakes in Java performance coding. The presentation also hints at future enhancements in JDK 8 and discusses various JVM features and tuning strategies.

1. Java Performance Explained
In 15 second blind-ignite-sized chunks…
Bravely Presented By: Richard Warburton & Martijn Verburg
Slides Created By: Daniel Bryant

2. Which Java developers should be
interested in performance?

3. How can I learn to write Java code
that performs well?

4. Is there any part of the JDK I should
avoid for performance reasons?

5. How useful is “Mechanical Sympathy”?
(as popularised by Martin Thompson)

6. Do we love L.A.M.P?...
Or Java on Windows?...
(for best performance)

7. How does the JVM optimise code?

8. How can I tune JVM performance?

9. “Cool cats” enable as many GC Flags as
possible, right?

10. When should I turn on GC logging?
Java -XX:+PrintGCDetails
-XX:+PrintGCDateStamps
-XX:+PrintTenuringDistribution
-Xloggc:logs/gc.log
...

11. GC Logs in production, really?
My manager doesn’t like that…

12. Do products exist to analyse GC Logs?

13. Random Heap Usage Graph - explain… 

14. How common is “Yak Shaving” with
performance diagnostics / tuning?

15. How does the Azul JVM work its magic?
(in 15 seconds or less…)

16. What’s all the fuss
about Shenandoah?

17. How effective is ‘off heap’ storage?

18. Any noteworthy performance stuff in the
soon to be released JDK 8?
* GA Release: 18/03/2014. http://openjdk.java.net/projects/jdk8/milestones

19. Most common performance-related
mistake you see in Java code?

20. How can I troll Java
performance mailing
lists? 

21. Great work! And relax…
(Let’s have a round of applause!)