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Performance analysis and tuning is often treated as an issue of subordinate importance until eventually in one of the final project phases the developers attempt to verify that their implementation meets the performance requirements.  Typically, a performance tuning is necessary to meet the goals. 

Potential performance issues to be addresses in this phase include memory management and garbage collection: 

The workshop explains the above mentioned aspects of performance tuning. Attendants will explore tools for analysis of memory memory management and garbage collection. They will learn and practice strategies and tactics for profiling and tuning the JVM's garbage collector.  As JVM tuning is vendor-specific, the workshop's focus is on one particular JVM: the HotSpot JVM developed by Sun Microsystems (now owned by Oracle).

The JVM developed by Sun has been refined and revised with every release of the JDK since the advent of Java in the mid 90ies.  Today, Java developers face an abundance of GC algorithms - from plain and simple serial stop-the-world collectors with a single reaper thread to highly parallelized collectors that run several GC threads concurrently with application threads.  

Each of these collectors can be configured and tuned in various ways in order to control pause times or increase throughput.  The number of choices a Java developer has for configuring the JVM?s garbage collection for his application is overwhelming. Hence, garbage collector tuning for the SUN/Oracle JVM is often perceived as a daunting task.

The workshop aims to shed light onto the garbage collection strategies in the Sun/Oracle JVM by first explaining all algorithms including the new ?Garbage First? (G1) collector.  We then take a look at the collectors? tuning parameters and  practice GC tuning in hands-on labs using various tools.  

The workshop provides sound knowledge tailored to professional programmers in an industrial context.  The workshop does not only present theoretical background knowledge, but a strong focus is on gaining practical experience.  For this reason, a substantial part of the workshop consists of hands-on labs.
 

This is a workshop for Java programmers responsible for performance analysis and tuning and devopers interested in memory management and garbage collections issues.

The course is designed to build on existing expertise as Java programmers and aims to take the skills one step further. Prerequisite for the seminars is basic knowledge of Java  and an understanding of virtual machine principles. 

OBJECTIVES

	Understand garbage collection
	Know how to choose a garbage collector
	Practice how to profile the garbage collector
	Know your tuning options
	Develop tuning strategies

The course is designed by Klaus Kreft & Angelika Langer and backed by years of experience in teaching  Java related topics and more than a decade of real-world experience in industrial software development in Java.

Angelika Langer is a freelance trainer/mentor in the area of object-oriented software development in C++ and Java. She is a recognized author and speaker at conferences worldwide and author of the Java Generics FAQ .

Klaus Kreft is a senior consultant for more than 25 years and has served as the lead architect on several successful industry projects. He develops in Java since 1995. He is a regular speaker at OO conferences in Germany.

Together they are authors of the book "Standard C++ IOStreams and Locales" and numerous articles on C++ and Java topics in various computer magazines worldwide, including the series "Effective Java" currently published in the German JavaMagazin.

• Mark-and-Sweep
• Mark-and-Copy
• Fragmentation and Compaction
• Generation GC
• Parallel GC
• Concurrent GC
• "Garbage First" GC

• GC Profiling
• GC Tuning Goals
• Tuning for Maximum Throughput
• Tuning for Minimum Pause Times
• Tuning the G1 Collector
• Perm Space and Class Unloading