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

Differences to JRA


Due to the change to an event-based data model, some things are radically different compared to JRA. For instance, almost every tab now has a range selector. As everything now is an event, it almost always makes sense to be able to filter out data for a specific period of time. Another major change is that the data in general is much more fine-grained and there is a large number of new data sources.

We will discuss some of the more fundamental differences in detail.

The range selector

The following screenshot shows the General | Overview tab in the Flight Recorder GUI. This can be compared with the way it looked in JRA, as introduced in Chapter 8, The Runtime Analyzer.

As mentioned, the range selector (available at the top of the window) can now be found in almost every tab in the Flight Recorder. The backdrop for the range selector in a tab normally shows the amount of events active during the time of recording for the events used in that particular tab. For example, the...