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 functions

JMeter functions are special values that can populate fields or any sampler or other element in the test plan. They take the following form:


Here, __functionName matches one of the many function names JMeter offers. Parentheses surround the parameters sent to the function, which can vary from function to function. Functions with no parameters don't need the parentheses, for example, ${__threadNum}. A list of all available functions can be found on JMeter's website at Functions are divided into seven main categories. They are given here, along with their examples:

  • Information: threadNum, machineIP, time, and so on
  • Input: CSVRead, XPath, and so on
  • Calculation: counter, Random, UUID, and so on
  • Scripting: javaScript, BeanShell, and so on
  • Properties: property, P, setProperty, and so on
  • Variables: split, eval, and so on
  • String: char, unescape, and so on

Functions can prove useful in certain situations...