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

Analyzing JRA recordings


Analyzing JRA recordings may easily seem like black magic to the uninitiated, so just like we did with the Management Console, we will go through each tab of the JRA editor to explain the information in that particular tab, with examples on when it is useful.

Just like in the console, there are several tabs in different tab groups.

General

The tabs in the General tab group provide views of key characteristics and recording metadata. In JRA, there are three tabs—Overview, Recording, and System.

Overview

The first tab in the General tab group is the Overview tab. This tab contains an overview of selected key information from the recording. The information is useful for checking the system health at a glance.

The first section in the tab is a dial dashboard that contains CPU usage, heap, and pause time statistics.

What to look for depends on the system. Ideally the system should be well utilized, but not saturated. A good rule of thumb for most setups would be to keep the...