Book Image

Performance Testing with JMeter 3 - Third Edition

By : Bayo Erinle
Book Image

Performance Testing with JMeter 3 - Third Edition

By: Bayo Erinle

Overview of this book

JMeter is a Java application designed to load and test performance for web application. JMeter extends to improve the functioning of various other static and dynamic resources. This book is a great starting point to learn about JMeter. It covers the new features introduced with JMeter 3 and enables you to dive deep into the new techniques needed for measuring your website performance. The book starts with the basics of performance testing and guides you through recording your first test scenario, before diving deeper into JMeter. You will also learn how to configure JMeter and browsers to help record test plans. Moving on, you will learn how to capture form submission in JMeter, dive into managing sessions with JMeter and see how to leverage some of the components provided by JMeter to handle web application HTTP sessions. You will also learn how JMeter can help monitor tests in real-time. Further, you will go in depth into distributed testing and see how to leverage the capabilities of JMeter to accomplish this. You will get acquainted with some tips and best practices with regard to performance testing. By the end of the book, you will have learned how to take full advantage of the real power behind Apache JMeter.
Table of Contents (17 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

JMeter properties and variables

JMeter properties are defined in (located in the $JMETER_HOME/bin directory), which is global in nature and used to define some defaults that JMeter uses. The value of the remote_hosts property encountered in last chapter is a good example of this. Properties can be referenced from within a test plan, but cannot be used for thread-specific values because of their global nature (shared among all threads).

JMeter variables, on the other hand, are local to each thread. The values may stay the same or vary between threads. In cases where a variable is updated by a thread, only the thread copy of the variable is changed, thus remaining invisible to other running threads. A good example of this is the Regular Expression Extractor post processor that we encountered in the previous chapters. The values extracted and acted upon are in the context of the samples of the running thread. The variables that are extracted are user-defined and available to...