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  4. JMeter — How to Distribute User Load in the Test Plan

JMeter — How to Distribute User Load in the Test Plan

Learn how to distribute load in a website performance test plan with JMeter.

Rupesh Garg user avatar by
Rupesh Garg
·
Nov. 05, 18 · Tutorial
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You might have encountered this situation where not all users would do a particular scenario all the time. Let's consider an e-commerce application, having the major scenarios user login, search, browsing the application by an anonymous user, product added to cart, and buying the product. For example:

  • 40% authenticated users logging into the website
  • 30% of anonymous users browsing the website
  • 20% of users doing a search
  • 9% of users adding a product to the cart
  • And 1% of all users actually buying the product

To mimic this behavior in a load test script, we use the Throughput Controller which controls how often a particular scenario should be executed. The controller contains two modes:

  • Percent Executions
  • Total Executions

Now we will see how these two modes can be executed in the test plan:

Consider 100 users/threads to be run. Percent Executions mode commands the controller to execute a certain percentage of the iterations through the test plan as defined in the Throughput textbox shown below:Image title

As you can see below, after execution of the Test Plan, the samplers have executed according to the frequency (throughput) set in each request.

Image title

Total Executions mode commands the controller to stop executing after a certain number of iterations have completed as given by the Throughput textbox shown below.

Image title

As you can see below, the samplers have executed as per the limit defined in Total Executions, instead of all requests hitting with 100 users.

Image title

If the Per User checkbox is checked, the controller executes per user/thread basis. If unchecked, then the calculation will be global for all users.

Let's understand the Per User case with an example. Say our test configuration is 100 users and the duration of the test plan is 300 seconds.

Image title

Let's use total execution mode and check Per User.

Image title

As you can see, the total number of executions is equal to the number of users times the number given for throughput.

Image title


Test plan Testing

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