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)

Structure of a Test Case

A test case can be divided into three parts.

Figure 3.25: Structure of a test case


A load test often has a so-called "ramp-up" period.

This period corresponds to the gradual arrival of virtual users on the target system.

A warm-up period allows both the target server and the injectors to:

  • Warm up the just in time (JIT) compiler of the java virtual machine (JVM) injectors
  • Warm up the JIT of the (JVM)/common language runtime (CLR) of the tested application
  • Retrieve/initiate resources (database connections, brokers queues, and so on)
  • Fill caches
  • Initiate the mechanism of autoscaling
  • Distribute loads in a uniform manner (load balancer and so on) and so on

Ramp-up is configured with the Thread Group parameters.

Figure 3.26: Ramp-Up

The arrival rate of users is calculated as follows:

  • The ramp-up time divided by the number of units (VUs)

Example for 300 seconds duration with 100 users:

  • Frequency...