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Live Java Profiling

Fabian Lange
November 07, 2012
Technology
1
970

Live Java Profiling

Fabian Lange

November 07, 2012
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Transcript

  1. Live Java Profiling Fabian Lange

  2. Haben wir ein Problem?

  3. "WE SHOULD FORGET ABOUT SMALL EFFICIENCIES, SAY ABOUT 97% OF

    THE TIME: PREMATURE OPTIMIZATION IS THE ROOT OF ALL EVIL" Donald Knuth (1974)

  4. Wissen ist Macht

  5. Die JVM als Informant

  6. Der Profiler als Übersetzer

  7. Profiler sind Nerds

  8. Sprache der Profiler • Instrumentation • Sampling • Wall Clock

    & CPU Time • Self & Cumulative • Allocation • Live & GCed • Hotspot

  9. Pseudocode t main() foo() bar() baz()

  10. Sampling t main() foo() bar() baz()

  11. Sampling t main() foo() bar() baz()

  12. Sampling t main() foo() bar()

  13. None

  14. Instrumentation t main() foo() bar() baz()

  15. Instrumentation t main() foo() bar() baz()

  16. PROFILERBAU https://github.com/CodingFabian/SamplingVsInstrumentation

  17. https://blog.codecentric.de/en/2011/10/measure-java-performance- sampling-or-instrumentation/

  18. http://www-plan.cs.colorado.edu/klipto/ http://bryanpendleton.blogspot.de/2010/08/improving-accuracy-of- java-profilers.html

  19. REAL WORLD

  20. ITEXT

  21. None

  22. ITEXT Analyse mit JProfiler

  23. JBOSS RULES

  24. None

  25. JBOSS RULES Analyse mit JProfiler

  26. VAADIN

  27. None

  28. VAADIN Analyse mit JProfiler

  29. GLUSTER

  30. None

  31. -XX:+HeapDumpOnOutOfMemoryError

  32. GLUSTER Analyse mit Eclipse MAT

  33. Profiling Tipps • Mit Sampling starten • CPU – Hotspots

    – Pfeil-Rechts • Speicher – Allocation Hotspots – Hohe Objektanzahl – Filter nach eigenem Package • Threads – Timeline – Dumps • Absolute / Relative Anzeige ausprobieren

  34. PROFILING IST EINFACH

  35. Kontakt • CodingFabian • [email protected] • blog.codecentric.de Folien auf speakerdeck.com/codingfabian