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

The dangers of benchmarking


It is sometimes all too easy to focus too much on the results of a particular benchmark and let this "tunnel vision" take over all performance work.

It is very important that a wide selection of standard industry benchmarks exists, as they will be used by anyone from hardware vendors to undergraduate researchers, for ultimately increasing performance for various runtimes and applications. Conclusions drawn, given a benchmark setup, can have wide-ranging implications.

One danger is, of course, if a mainstream benchmark gets too well adopted. Classic examples here are the SPECjvm benchmark suite and later the SPECjbb benchmark.

To put it bluntly, if a graduate student can run a benchmark from his workstation with a simple command line, the problems it addresses will get much love and research. If not, they won't. SPECjbb has a simple command line, SPECjAppServer doesn't. SPECjAppServer, in itself, is an excellent benchmark that pretty much stresses any desired portion...