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

Controlling code generation in JRockit


JRockit is designed to work well out of the box, and it is generally discouraged to play around too much with its command-line options. Changing the behavior of code generation and optimization is no exception. This section exists mostly for informational purposes and the user should be aware of possible unwanted side effects that can arise from changing the behavior of the code generators.

Note

This section applies mainly to the versions of JRockit from R28 and later. For earlier versions of JRockit, please consult the JRockit documentation for equivalent ways of doing the same thing. Note that all R28 functionality does not have equivalents in earlier versions of JRockit.

Command-line flags and directive files

In the rare case that the code generator causes problems in JRockit, or an application behaves strangely or erroneously, or it just takes too long time to optimize a particular method, the JRockit code generator behavior can be altered and controlled...