Book Image

Oracle JRockit: The Definitive Guide

Book Image

Oracle JRockit: The Definitive Guide

Overview of this book

Oracle JRockit is one of the industry’s highest performing Java Virtual Machines. Java developers are always on the lookout for better ways to analyze application behavior and gain performance. As we all know, this is not as easy as it looks. Welcome to JRockit: The Definitive Guide.This book helps you gain in-depth knowledge of Java from the JVM’s point of view. We will explain how to write code that works well with the JVM to gain performance and scalability. Starting with the inner workings of the JRockit JVM and finishing with a thorough walkthrough of the tools in the JRockit Mission Control suite, this book is for anyone who wants to know more about how the JVM executes your Java application and how to profile for better performance.
Table of Contents (23 chapters)
Oracle JRockit
Credits
Foreword
About the Authors
Acknowledgement
About the Reviewers
Preface
12
Using the JRockit Management APIs
Bibliography
Glossary
AST
CAS
HIR
IR
JFR
JMX
JRA
JSR
LIR
MD5
MIR
PDE
RCP
SWT
TLA
Index

Summary


This chapter covered automatic memory management in detail, concentrating on adaptive memory management, where feedback from the runtime system is continuously used to optimize GC performance.

We explained the mark and sweep as well as the stop and copy strategies for garbage collection and discussed how more advanced variants of these can work in a modern runtime, especially JRockit. We discussed how to implement fast scalable GC on all levels from software to hardware.

Every GC needs to stop the world at some point, for example when sweeping or compacting. Stopping the world introduces latencies. The main lesson is that we can optimize either for throughput or for low latencies, one at the cost of the other.

We introduced the product JRockit Real Time, that provides a degree of determinism and pause time targets for the JVM. JRockit Real Time can massively improve response times and decrease their deviation for most applications without the need to modify the applications.

Some of...