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Editing Test Mix Models to Specify the Probability of a Virtual User Running a Test

The test mix model specifies the probability of a virtual user running a given test in a load test scenario. This lets you simulate load more realistically. Instead of having just one workflow through your applications, you can have several workflows, which is a closer approximation of how end-users interact with your applications.

You can specify one of the following test mix model options for your load test scenario:

  • Based on the total number of tests: Determines which Web performance or unit test is run when a virtual user starts a test iteration. At the end of the load test, the number of times that a particular test was run matches the assigned test distribution. Use this test mix model when you are basing the test mix on transaction percentages in an IIS log or in production data.

  • Based on the number of virtual users: Determines the percentage of virtual users who will run a particular Web performance or unit test. At any point in the load test, the number of users who are running a particular test matches the assigned distribution. Use this test mix model when you are basing the test mix on the percentage of users running a particular test.

  • Based on user pace: Over the course of the load test, each Web performance test or unit test is run a specified number of times per users, per hour. Use this test mix model when you want virtual users to run test at a certain pace throughout the load test.

  • Based on sequential order: Each virtual user runs the Web performance or unit tests in the order that the tests are defined in the scenario. The virtual user continues cycling through the tests in this order until the load test is complete.

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Associated Topics

Specifying the test mix for your load test: When you create a load test, you specify settings for the load test in the New Load Test Wizard. In the New Load Test Wizard, you choose existing Web and unit tests to add to the initial scenario. After you have added tests to the scenario, you specify the test mix for the scenario.

You use load modeling options to more accurately predict the expected real-world usage of a Web site or application that you are load-testing. It is important to do this because a load test that is not based on an accurate load model can generate misleading results.

Edit the test mix model: You can change a load test scenario to use one of the test mix models by using the Load Test Editor.

Configure pacing delay for a user paced test mix model: If your load test scenario is configured to use the Based on user pace test mix model, you can specify how you want the distribution Pacing Delay configured.

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