presentation by Matt Brasier Head of Consulting, C2B2 Ltd

2. Practical Enterprise Java Performance Tuning Matt Brasier Principal Consultant, C2B2 Ltd

3. Agenda Introduction Performance tuning toolbox Examples Summary

4. Introduction Who Am I? Matt Brasier Principal Consultant at C2B2 Consulting 10 years Java EE experience 6 years as a consultant

5. Introduction This talk Introduction to tools used Practical demonstrations Download the example application www.c2b2.co.uk/judcon/sampleapp.zip

6. Performance consultant’s toolbox

7. JBoss admin console

8. JBoss admin console http://localhost:8080/admin-console Since JBoss 5 Cut-down version of RHQ

9. JBoss jmx-console

10. JBoss jmx-console http://localhost:8080/jmx-console Dynamic view of JMX mbeans Information overload Fast if you know what you are looking for A few really useful features

11. VisualVM

12. VisualVM Distributed with JDK 6 Successor to jconsole Install all the plugins! jvisualvm from the command line

13. Command line JDK tools jps Process IDs of Java processes jstat JVM statistics for things such as GC jstack Thread dumps jhat Heap dump analysis

14. Testing Tools

15. JMeter

16. JMeter http://jakarta.apache.org/jmeter/ Load testing tool Easy to produce scripts Can record scripts from a browser Can run in distributed mode

17. The Grinder

18. The Grinder http://grinder.sourceforge.net/ Load testing tool More complex scripts than Jmeter Jython based Better for extreme testing

19. Live Demo

20. Summary The JVM and JMX make a lot of information available The tools to get at the information are readily available All that you have to do is understand what it is telling you

21. Hot method Repeated Thread dumps reveals one method appears frequently It is either occuring a lot or running slowly

22. System.gc Frequent major garbage collections jstat shows a large GCT and System.gc as the previous GC cause VisualVM shows large proportion of CPU time spent garbage collecting

23. Synchronization Thread dump reveals large number of threads blocked waiting for the same lock

24. Key techniques Load testing Thread dumps Visual VM Swiss army knife of Java consultants

25. Questions?

26. Thank you