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Master Apache JMeter - From Load Testing to DevOps

You're reading from   Master Apache JMeter - From Load Testing to DevOps Master performance testing with JMeter

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Product type Paperback
Published in Aug 2019
Publisher
ISBN-13 9781839217647
Length 468 pages
Edition 1st Edition
Languages
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Authors (3):
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Bruno Demion (Milamber) Bruno Demion (Milamber)
Author Profile Icon Bruno Demion (Milamber)
Bruno Demion (Milamber)
Antonio Gomes Rodrigues Antonio Gomes Rodrigues
Author Profile Icon Antonio Gomes Rodrigues
Antonio Gomes Rodrigues
Philippe Mouawad Philippe Mouawad
Author Profile Icon Philippe Mouawad
Philippe Mouawad
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Toc

Table of Contents (14) Chapters Close

About the Book 1. Quick Start with JMeter FREE CHAPTER 2. JMeter Overview 3. Designing a Test Case 4. Important Concepts in JMeter 5. Preparing the Test Environment (Injectors and Tested Systems) 6. Being Productive with JMeter 7. Load Testing a Website 8. Load Testing Web Services 9. Load Testing a Database Server 10. Load Testing Message-Oriented Middleware (MOM) via JMS 11. Performing a Load Test 12. Visualizing and Analyzing the Load Testing Results 13. Integration of JMeter in the DevOps Tool Chain

How Timer Scope Works

Timers are important to simulate think time in our script. Think time is the time a user takes between two interactions with the application to do things such as the following:

  • Read screen content
  • Enter login and password
  • Enter order form data

To avoid unexpected behavior, it's critical to understand how and when Timers are executed.

There are two rules, and these rules apply regardless of the location of the timer.

Rule 1: Timers Are Executed before Each Sampler in Their Scope

For example, consider the following script:

Figure 4.6: Our script with one timer

This script will be executed in the following order:

Figure 4.7: Execution order of our script with one timer

As we can see, Timer1 is:

  • Executed three times because of the scoping rule
  • Executed once before Sampler1
  • Executed once before Sampler2
  • Executed once before Sampler3

Rule 2: If There Is More Than One Timer in the Scope, All the Timers Will Be Processed...

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