January 15, 2015

Noise Generator in Performance Testing

Add Script Dialog

What is a Noise Generator?

In this article, we will see about noise generator in performance testing and its purpose. Recently HP has released its latest version of LoadRunner 12.02 with the capability of adding noise generation in the Controller.

Noise Generator

We can follow two approaches while testing the performance of the application: with noise generation and without noise generation. Typical tests with complex business scenarios, actions, transactions, etc. would be without noise generation.

Along with a complex business scenarios, actions, transactions, if you add a small load of GET request of the core URL that you are testing creates a noise in the background. This is called Noise Generator.

How to add Noise Generator to your script in LoadRunner?

Follow the below steps to add a noise generator to the scenario:

  1. Launch Controller
  2. In Design tab, right click on the script and select Add Script as shown below.
Add Script

Add Script

  1. Select Use a Noise Generator script accessing the following URL: and enter the URL under test as shown below.
Add Script Dialog

Add Script Dialog

  1. Click on OK.

Script path will be automatically added with the prefix “Noise_”. If you see the details of the script, you could see the script type as Noise as shown below.

Script Information

Script Information

Advantages of Noise Generator

  • No need to script the flow
  • One click settings
  • No specific configuration is required

Please note that you need to pay one tenth of the price of a regular virtual user.

About NaveenKumar Namachivayam

Hi there! is a passionate and experienced Performance Test Analyst based in Chicago, USA with skill sets in Manual Testing, Test Automation, Performance Testing, and Test Estimation. He loves to learn and experiment new trends and models in Software Testing. Please stop by at his personal blogs: Excel Blog, DealsBrook,, and Affiliate Insights blog and Software Testing Memes.

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