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  • Book Overview & Buying Oracle JRockit: The Definitive Guide
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Oracle JRockit: The Definitive Guide

Oracle JRockit: The Definitive Guide

By : Marcus Hirt, Marcus Lagergren
4.8 (10)
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Oracle JRockit: The Definitive Guide

Oracle JRockit: The Definitive Guide

4.8 (10)
By: Marcus Hirt, Marcus Lagergren

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)
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Oracle JRockit
Credits
Foreword
About the Authors
Acknowledgement
About the Reviewers
Preface
12
Using the JRockit Management APIs
1
Bibliography
2
Glossary
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AST
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CAS
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HIR
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IR
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JFR
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JMX
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JRA
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JSR
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LIR
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MD5
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MIR
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PDE
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RCP
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SWT
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TLA
3
Index

Allocation traces


The last major feature in Memleak to be discussed in this book, is the ability to turn on allocation tracing for any given type. To, for instance, find out where the Leak$DemoObjects are being allocated in our previous example, simply right click on the type and then click on Trace Allocations. The example has been tailored to do allocations in the vicinity of the code that causes the actual leak (note that this is normally not the case).

As can be readily seen from the screenshot, we are invoking put more often than remove. If we are running Memleak from inside Eclipse, we can jump directly to the corresponding line in the Leak class by right clicking on the stack frame and then clicking on Open Method from the context menu.

Allocation traces can only be enabled for one type (class) at a time.

Note

A word of caution: Enabling allocation traces for types with a high allocation pressure can introduce significant overhead. For example, it is, in general, a very bad idea to...

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