An Introduction to Java Profiling Developer's Day 2008 Patrick Schlebusch

Developer's Day 2008

Patrick Schlebusch

Overview An Introduction to Java Profiling An Introduction to Profiling YourKit Java Profiler Demonstration Additional information

An Introduction to Profiling

YourKit Java Profiler

Demonstration

Additional information

What is Profiling? An Introduction to Profiling A development tool Dynamic performance analysis at runtime Implicit: Performance optimization based on analysis results

A development tool

Dynamic performance analysis at runtime

Implicit: Performance optimization based on analysis results

Development Process An Introduction to Profiling Problem analysis Design Development Testing Deployment Profiling

Goals An Introduction to Profiling Measuring and locating performance „bottlenecks“ Time-expensive functions or code parts Memory leaks and unnecessary memory allocation Deadlocks Useful interpretation of analysis results Software performance improvements Provide a detailed view on runtime behaviour

Measuring and locating performance „bottlenecks“

Time-expensive functions or code parts

Memory leaks and unnecessary memory allocation

Deadlocks

Useful interpretation of analysis results

Software performance improvements

Provide a detailed view on runtime behaviour

Problems An Introduction to Profiling Profiling produces overhead Interpretation of results can be difficult Identifying the „crucial“ parts of the software Recognizing potential for improvements

Profiling produces overhead

Interpretation of results can be difficult

Identifying the „crucial“ parts of the software

Recognizing potential for improvements

YourKit Java Profiler yourKit Java Profiler Commercial Java Profiling Tool Free tryout and Open Source licenses are available Used by Open Source projects such as various Apache projects, Azureus (many more..) Also used by Sun Microsystems, Google, SAP and at i5

Commercial Java Profiling Tool

Free tryout and Open Source licenses are available

Used by Open Source projects such as various Apache projects, Azureus (many more..)

Also used by Sun Microsystems, Google, SAP and at i5

Features yourKit Java Profiler On-Demand Profiling CPU, Memory and Concurrency profiling methods IDE Integration Profiling API Support of many different Java versions and OSs

On-Demand Profiling

CPU, Memory and Concurrency profiling methods

IDE Integration

Profiling API

Support of many different Java versions and OSs

CPU Profiling yourKit Java Profiler Sampling Low overhead Useful to find slow parts of the code Tracing Significant overhead Exact CPU time and method invokation counts CPU Usage graphs

Sampling

Low overhead

Useful to find slow parts of the code

Tracing

Significant overhead

Exact CPU time and method invokation counts

CPU Usage graphs

Memory Profiling yourKit Java Profiler Memory telemetry graphs Heap / Non-Heap memory Class loading statistics Object count and size of classes Explicit garbage collection Object allocation recording

Memory telemetry graphs

Heap / Non-Heap memory

Class loading statistics

Object count and size of classes

Explicit garbage collection

Object allocation recording

Thread Profiling yourKit Java Profiler Deadlock detection Synchronization analysis For which synchronized blocks or methods are Threads waiting? How long?

Deadlock detection

Synchronization analysis

For which synchronized blocks or methods are Threads waiting?

How long?

Demonstration

Additional Information YourKit Java Profiler www.yourkit.com Jprobe www.quest.com/jprobe/ JProfiler www.ej-technologies.com/products/jprofiler/ Various Open Source Profilers java-source.net/open-source/profilers

YourKit Java Profiler

www.yourkit.com

Jprobe

www.quest.com/jprobe/

JProfiler

www.ej-technologies.com/products/jprofiler/

Various Open Source Profilers

java-source.net/open-source/profilers

Thank you.