Tools for Measuring System and Application Performance

1. Tools for Measuring System and Application Performance • Introduction • GlancePlus • Introduction • Glance Motif • Glance Character Mode • Glance Command-line • Xverbosegc • HPjmeter and –Xeprof • Other Tools

2. HPjmeter Understanding Your Java Application’s Performance

3. HPjmeterFree and Easy to Use • Analyzes Java application performance • Graphical • Free • Runs on any platform • http://www.hpjmeter.com/

4. HPjmeterHow To Collect Metrics JVMPI Java 1.2.1-A and compatible Java 1.3.0-C and compatible java.hprof.txt JVMPI+ (HP-UX) Java 1.1.8+ Java 1.2.2.05+ Java 1.3.x HPjmeter java.eprof 1.1 Java 1.1.x java.prof

5. HPjmeterJVMPI Options Options to use to any JVM: cpu=samples,thread=y,depth=10,cutoff=0,format=a heap=all,cpu=samples,thread=y,depth=10,cutoff=0,format=a monitor=y,cpu=samples,thread=y,depth=10,cutoff=0,format=a A support matrix for the features you need is online and in Help

6. HPjmeterJVMPI - Xrunhprof hprof usage: -Xrunhprof[:help]|[<option>=<value>, ...] Option Name/Value Description Default --------------------- ----------- ------- heap=dump|sites|all heap profiling all cpu=samples|times|old CPU usage off monitor=y|n monitor contention n format=a|b ascii or binary output a file=<file> write data to file java.hprof(.txt) net=<host>:<port> send data over a socket write to file

7. HPjmeterJVMPI - Xrunhprof hprof usage: -Xrunhprof[:help]|[<option>=<value>, ...] Option Name and Value Description Default --------------------- ----------- ------- depth=<size> stack trace depth 4 cutoff=<value> output cutoff point 0.0001 lineno=y|n line number in traces? y thread=y|n thread in traces? n doe=y|n dump on exit? y Example: java -Xrunhprof:cpu=samples,file=log.txt,depth=3 FooClass

8. HPjmeterEnhanced Profiling for HP-UX • Profiling option for HotSpot • -Xeprof:help • Collects CPU time separately per thread • Very low intrusion

9. HPjmeterHP JVM’s -Xeprof Option Options to use for HP’s JVM: -Xeprof:file=java.$$.eprof Specify the $$ in the script with the java command to include the Process Identifier in the name and ensure files are not overwritten

10. HPjmeterSPEC JVM 98 Benchmark Low Intrusion! Faster than Classic

11. HPjmeterElapsed (Wall Clock) and CPU Time • Inclusive and Exclusive times • Methods • Classes • Process • Thread • Call Graph • Tree form • Call hierarchy navigation • Ability to find callers quickly!

12. HPjmeterObject Creation • Allocated Objects • Residual Objects • Location in code where created • Reference Graph • Tree form • Ability to find referencing objects

13. HPjmeterHP JVM’s -Xeprof Option Options to use for HP’s JVM: -Xeprof:file=java.$$.eprof Specify the $$ in the script with the java command to include the Process Identifier in the name and ensure files are not overwritten

15. Help: User’s Guide

16. How to run HPjmeter

17. Measure Object Creation

18. File: Open

20. Select File to Open

21. Open

22. Reading Thread Data

23. Creating Internal Data Structures

24. Program Information Elapsed Time Number of Methods Threads

25. Where’s the Time Going? • CPU bound application • Find method consuming highest amount of time • Find location in call chain

26. Metrics

27. Exclusive Method Time (CPU)

28. Sorted in Decreasing Order

29. Select Highest

30. Mark Selected Item to Find

31. Switch to Call Tree

33. Find Selected Item Immediately

34. Automatic Expansion Double-click for All Callers

36. Overloaded Methods Distinguish by Parameters

37. View:Arguments

40. Arguments Displayed

41. 1. Select 2. Mark to Find

42. Find Immediately

44. Exceptions • Bad programming practice to use as: • Terminators for searches • Indicators of a frequent exception condition • HPjmeter makes them easy to find • Guess:Exceptions Thrown

45. Guess:Exceptions Thrown

48. Select Highest

49. Mark to Find

50. Switch to: Call Graph Call Count