1. Page 1 © 2001 Hewlett-Packard Company 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. Page 2 © 2001 Hewlett-Packard Company HPjmeter Understanding Your Java Application’s Performance

3. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 3 HPjmeter Free and Easy to Use Analyzes Java application performance Graphical Free Runs on any platform http://www.hpjmeter.com/

4. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 4 HPjmeter How To Collect Metrics HPjmeter java.eprof java.prof java.hprof.txt 1.1 Java 1.1.x JVMPI+ (HP-UX) Java 1.1.8+ Java 1.2.2.05+ Java 1.3.x JVMPI Java 1.2.1-A and compatible Java 1.3.0-C and compatible

5. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 5 HPjmeter JVMPI 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. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 6 HPjmeter JVMPI - Xrunhprof hprof usage: -Xrunhprof[:help]|[ =,...] Option Name/Value Description Default --------------------- ----------- ------- heap=dump|sites|all heap profiling all cpu=samples|times|oldCPU usage off monitor=y|n monitor contention n format=a|b ascii or binary outputa file= write data to file java.hprof(.txt) net= : send data over a socketwrite to file

7. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 7 hprof usage: -Xrunhprof[:help]|[ =,...] Option Name and Value Description Default --------------------- ----------- ------- depth= stack trace depth 4 cutoff= 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 HPjmeter JVMPI - Xrunhprof

8. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 8 HPjmeter Enhanced Profiling for HP-UX Profiling option for HotSpot -Xeprof:help Collects CPU time separately per thread Very low intrusion

9. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 9 HPjmeter HP 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. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 10 HPjmeter SPEC JVM 98 Benchmark Low Intrusion! Faster than Classic

11. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 11 HPjmeter Elapsed (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. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 12 HPjmeter Object Creation Allocated Objects Residual Objects Location in code where created Reference Graph –Tree form –Ability to find referencing objects

13. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 13 HPjmeter HP 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

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15. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 15 Help: User’s Guide

16. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 16 How to run HPjmeter

17. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 17 Measure Object Creation

18. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 18 File: Open

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20. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 20 Select File to Open

21. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 21 Open

22. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 22 Reading Thread Data

23. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 23 Creating Internal Data Structures

24. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 24 Program Information Elapsed Time Number of Methods Threads

25. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 25 Where’s the Time Going? CPU bound application Find method consuming highest amount of time Find location in call chain

26. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 26 Metrics

27. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 27 Exclusive Method Time (CPU)

28. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 28 Sorted in Decreasing Order

29. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 29 Select Highest

30. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 30 Mark Selected Item to Find

31. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 31 Switch to Call Tree

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33. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 33 Find Selected Item Immediately

34. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 34 Automatic Expansion Double-click for All Callers

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36. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 36 Overloaded Methods Distinguish by Parameters

37. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 37 View:Arguments

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40. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 40 Arguments Displayed

41. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 41 1. Select 2. Mark to Find

42. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 42 Find Immediately

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44. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 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. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 45 Guess:Exceptions Thrown

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48. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 48 Select Highest

49. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 49 Mark to Find

50. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 50 Switch to: Call Graph Call Count

51. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 51 Find Immediately

52. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 52 Automatic Expansion Find Called Methods

53. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 53 Click on “o->” to Expand

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57. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 57 Double-click for All Callers

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59. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 59 Start new search: Tree:Collapse All

60. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 60 Select Next Highest

61. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 61 What Exceptions?

62. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 62 Expand

63. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 63 Empty Stack Exception!

64. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 64 Select Next Highest

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66. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 66 Empty Stack Exception!

67. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 67 Investigate Others: Date

68. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 68 Illegal Argument Exception!

69. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 69 HPjmeter Threads Thread Lifetimes Thread states - CPU, I/O, Waiting, GC,... Color coded to emphasize important performance characteristics Distribution over lifetime Visualize thread starvation Sort Thread Histogram by: Birth time of thread Heuristic based on each thread’s metrics CPU time used by method in Find pop-up

70. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 70 Threads Histogram

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72. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 72 Double-click for Pie Chart

73. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 73 Massive Lock Contention!

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75. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 75 HPjmeter Java Application Monitor Contention Highlights contested Java monitors JDK 1.3.1 – Exact metrics generated for contention Metrics: Lock requests when lock held Per-method time spent waiting for lock

76. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 76 Metric: Total Lock Delay

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78. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 78 Mark Selected Item to Find

79. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 79 Display Contents of Find Edit:Find

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81. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 81 Threads Histogram More Work Done

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84. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 84 Sort by _service()

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86. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 86 Switch to Thread View Scope:Thread

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88. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 88 Select Thread

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90. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 90 Metric: Total Lock Delay

91. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 91 103343 spent in _service()

92. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 92 How much total time spent in _service()? Metric: Exclusive Clock

93. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 93 106989 spent in _service()

94. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 94 97% (103343/106989) spent in waiting for lock in _service()

95. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 95 Save Metric to File

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98. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 98 Exclusive Method Time (CPU)

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108. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 108 HPjmeter Object Creation Allocated Objects Residual Objects Location in code where created Reference Graph –Tree form –Ability to find referencing objects

109. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 109 HPjmeter Object Creation Created Objects Count with -Xeprof requires either: -Xeprof:inlining=disable or: -Xint -Xeprof Created Objects (Bytes) requires use of the the Classic JVM and hprof: java -classic -Xrunhprof:heap=all,cutoff=0,...

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119. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 119 HPjmeter Profile Comparison Compare profile data from two different runs – See impact of – Code modification – Load change – Eliminate start-up noise – Find “memory retention”

120. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 120 HPjmeter Profile Comparison

121. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 121 HPjmeter Profile Comparison More Work Done

122. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 122 HPjmeter Other Features Search Mark and Find Save displayed metrics to a file On-line help

123. Tools for Measuring Performance © 2001 Hewlett-Packard Company Page 123 HPjmeter Contact Info Web links: http://www.hpjmeter.com/ Write to us: java-tools-support@cup.hp.com