Book Image

JBoss AS 5 Performance Tuning

By : Francesco Marchioni, Jason Savod
Book Image

JBoss AS 5 Performance Tuning

By: Francesco Marchioni, Jason Savod

Overview of this book

Today's organizations need to deliver faster services to a large set of people and businesses. In order to survive this challenge, enterprises need to optimize the performance of their application server along with its components and hardware. Writing faster applications is no longer just an option for your products; it's an imperative requirement, which you cannot ignore. JBoss AS 5 Performance Tuning will teach you how to deliver fast applications on the JBoss Application Server and Apache Tomcat, giving you a decisive competitive advantage over your competitors. You will learn how to optimize the hardware resources, meeting your application requirements with less expenditure.The performance of Java Enterprise applications is the sum of a set of components including the Java Virtual Machine configuration, the application server configuration (in our case, JBoss AS), the application code itself and ultimately the operating system. This book will show you how to apply the correct tuning methodology and use the tuning tools that will help you to monitor and address any performance issues. By looking more closely at the Java Virtual Machine, you will get a deeper understanding of what the available options are for your applications and how their performance will be affected. You will learn about thread pool tuning, EJB tuning, JMS tuning, Enterprise Java Beans, and the Java Messaging Service. The persistence layer and JBoss Clustering service each have a chapter dedicated to them as they are two of the most crucial elements to configure correctly in order to run a fast application. You will also learn how to tune your web server, enabling you to configure and develop web applications that get the most out of the embedded Tomcat web server.
Table of Contents (17 chapters)
JBoss AS 5 Performance Tuning
About the Author
About the Reviewers
A Tuned Mind


JVM tuning is an ever-evolving process that has changed with each version of Java. Since the release 5.0 of the J2SE, the JVM is able to provide some default configuration (Ergonomics), which is consistent with your environment. However, the smarter choice provided by Ergonomics is not always the optimal and without an explicit user setting, the performance can fall below your expectations.

Basically, the JVM tuning process can be divided into three steps:

  • Choose a correct JVM heap size. This can be divided into setting an appropriate initial heap size (-Xms) and a maximum heap size (-Xmx).

    • Choose an initial heap size equal to maximum heap size for production environment. For development environment set up the initial heap size to about half the maximum size.

    • Don't exceed the 2GB limit for a single application server instance or the garbage collector performance might become a bottleneck.

  • Choose a correct ratio between young generations (where objects are initially placed after instantiation...