Profiling

• Profiling is a form of dynamic program analysis that measures, for example
  • Memory
  • CPU
  • ...

Java Profilers

• Profile Java applications and allow us to
  • Monitor application performance and memory consumption
  • Monitor application threads
  • Analyze memory allocation
  • Take and display thread dumps

How Java Profilers work?

• The JVM tool interface (JVM TI) is a native programming interface for use by tools
• It provides both a way
  • to inspect the state
  • to control the execution of applications running in the JVM
• JVM TI was introduced at JDK 5.0 and replaced JVMPI and JVMDI
• Java Management Extensions (JMX) is the common communications layer

Popular Java Profilers

http://zeroturnaround.com/rebellabs/top-5-java-profilers...

Survey which collected responses from over 1500 developers, testers, architects

VisualVM

• The standard Java profiler
• JDK 8 contains Java VisualVM tool based on VisualVM 1.3.6

  • From command line:
    $ jvisualvm

• Or download lastest version from http://visualvm.java.net/

VisualVM - Demo

Demonstration of using CPU Profiler & Call Trees to find slower methods than others

https://github.com/ufuk/java-demonstrations/tree/master/java-profiler-demo

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