An Introduction to Java Profiling

An Introduction to Java Profiling

Developer's Day 2008

Patrick Schlebusch

Overview
An Introduction to Java Profiling

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

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

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

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

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

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

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

Thread Profiling
yourKit Java Profiler

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

Thank you.

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Monday, 13th October 2008

An Introduction To Java Profiling