Book Image

Master Apache JMeter - From Load Testing to DevOps

By : Antonio Gomes Rodrigues, Bruno Demion (Milamber), Philippe Mouawad
Book Image

Master Apache JMeter - From Load Testing to DevOps

By: Antonio Gomes Rodrigues, Bruno Demion (Milamber), Philippe Mouawad

Overview of this book

Load tests help identify the maximum number of requests a software system can handle. One popular open source tool for load testing is JMeter. By leveraging the features and capabilities of JMeter, you can perform extensive load testing and fix issues in your application before they become problematic. This book is written by JMeter developers and begins by discussing the whole process, including recording a script, setting it up, and launching it, enabling you to almost immediately start load testing. You'll learn the best practices that you must follow while designing test cases. You'll also explore the different protocols offered by JMeter through various real-world examples. Finally, you'll see how to integrate JMeter into the DevOps approach and create professional reports. You'll discover ways to use the eco-system of JMeter to integrate new protocols, enrich its monitoring, and leverage its power through the use of the cloud. By the end of this book, you'll know all that's needed to perform comprehensive load testing on your applications by using all the best practices and features of JMeter.
Table of Contents (14 chapters)

Elements' Execution Order

The execution of elements in JMeter depends on their type and their scope:

  • Samplers and Controllers are not scoped elements – they are executed where they are located.
  • Pre-Processor, Post-Processor, Timer, Assertion, and Listener are scoped elements – they are executed where their scope applies AND their execution order depends both on their type and their position if two elements of the same type apply.
  • Config Elements are also scoped elements, but their execution depends on their type.

The first rule for execution order is the following:

Figure 4.3: Execution order based on type

As you can see in the following screenshot, the positions of different elements do not impact the execution order:

Figure 4.4: Type and not position, impacts the order of execution

The second rule is that outer elements are executed before inner elements of the same type:

Figure 4.5: Same elements execution order...