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About Run Settings

Run settings are a set of properties that influence the way a load test runs. Run settings are organized by categories in the Properties window.

You can have more than one run setting in a load test. Only one of the run settings may be active for a load test run. The other run settings provide a set of easily accessible alternative settings to use for subsequent test runs. The active run setting is accessed by the RunSettings property of the LoadTest class. In the Load Test Editor, the active run setting is identified by the "[Active]" suffix. You can change the active run setting by right-clicking a run setting node and choosing Set As Active. You can also change the active run setting by selecting the root node in the Load Test Editor and choosing a run setting name from the drop-down list in the Properties window.

The run setting categories are defined the following section:


A description of the Run Settings.

Maximum Error Details

The maximum number of request and response details of failed requests that are stored. This is important because detailed error results can consume a large amount of database storage. If you do not want to record error details, use a value of 0.


The name of the Run Setting as it appears in the Run Settings node of the Load Test Editor.

Validation Level

This defines the highest level of validation rule that will run in a load test. Validation rules are associated with Web test requests. Each validation rule has an associated validation level; high, medium, or low. This load test run setting will specify which validation rules will run while the Web test is run in the load test. For example, if this run setting is set to Medium, all validation rules marked as medium or low will be run.

Maximum Request URLs Reported

The maximum number of unique Web test request URLs on which to report results in this load test. You can increase this number if you have to, but doing this will also increase the size and processing time of the load test result.

Run unit tests in application domain

A Boolean value that determines whether each unit test assembly will run in a separate application domain when the load test contains unit tests. The default setting is True.

If your unit tests do not require a separate application domain or app.config file to function correctly, your unit tests might run faster by setting the value of this property to False.

Storage Type

The way to store the performance counters obtained in a load test. The options are as follows:

Timing Details Storage

This is used to determine which details will be stored in the Load Test Results Store. There are three values:

  • None - Do not collect any individual timing values. This is the default value.

  • StatisticsOnly - Collect and store only the statistics instead of storing the individual timing values for each test, transaction, and page executed/issued during the load test in the Load Test Results Store.

  • AllIndividualDetails - Collect and store individual timing values for each test, transaction, and page run/issued during the load test in the Load Test Results Store.

Minimum Duration of Traced SQL Operations

The minimum duration of a SQL operation to be captured by the SQL Trace, in milliseconds. For example, this allows you to ignore operations that complete quickly if you are trying to find SQL operations that are slow under load.

SQL Tracing Connect String

The connection string that is used to access the database to be traced.

SQL Tracing Directory

The location where the SQL Trace file is put after the trace ends. This directory must have write permissions for SQL Server and read permissions for the controller.

SQL Tracing Enabled

This enables the tracing of SQL operations. The default value is false.

For more information, see How to: Integrate SQL Trace Data.

Test Iterations

Specifies the total number of individual tests to run before the load test is complete. This property only applies when the property "Use Test Iterations" is True.

Use Test Iterations

If Use Test Iterations is True, then the load test runs until the number of individual tests completed within the load test reaches the number specified by the "Test Iterations" property. In this case, the time-based settings, which are Warm up Duration, Run Duration, and Cool-down Duration, are ignored. If "Use Test Iterations" is False, all the timing settings apply, and "Test Iterations" is ignored.

Run Duration

The length of the test, in hh:mm:ss format.

Sample Rate

The interval at which to capture performance counter values, in hh:mm:ss format.

Warm up Duration

The period between the beginning of the test and when the data samples start being recorded, in hh:mm:ss format. This is frequently used to step load virtual users to reach a certain load level before recording sample values. The sample values that are captured before the warm-up period ends are shown in the Load Test Monitor.

Cool-down Duration

The duration of the test cool-down period, expressed in hh:mm:ss format. Individual tests within a load test might still be running when the load test finishes. During the cool-down period, those tests can continue until they complete or the end of the cool-down period is reached. By default, there is no cool-down period, and individual tests are terminated when the load test finishes based on the Run Duration setting.

WebTest Connection Model

This controls the usage of connections from the load test agent to the Web server for Web tests running inside a load test. There are two Web test connection model options: ConnectionPerUser and ConnectionPool.

  • The ConnectionPerUser model simulates the behavior of a user who is using a real browser. Each virtual user who is running a Web test uses one or two dedicated connections to the Web server. The first connection is established when the first request in the Web test is issued. A second connection may be used when a page contains more than one dependent request. These requests are issued in parallel using the two connections. These connections are reused for subsequent requests within the Web test. The connections are closed when the Web test finishes. A drawback to this model is that the number of connections held open on the agent computer might be high (up to two times the user load), and the resources required to support this high connection count might limit the user load that can be driven from a single load test agent.

  • The ConnectionPool model conserves the resources on the load test agent by sharing connections to the Web server among multiple virtual Web test users. If the user load is larger than the connection pool size, then the Web tests run by different virtual users will share a connection. This could mean that one Web test might have to wait before it issues a request when another Web test is using the connection. The average time that a Web test waits before submitting a request is tracked by the load test performance counter Average Connection Wait Time. This number should be less than the average response time for a page. If it is not, then the connection pool size is probably too small.

WebTest Connection Pool Size

This specifies the maximum number of connections to make between the load test agent and the Web server. This only applies to the ConnectionPool model.

When you create a load test using the Load Test Wizard, you create your initial run settings. For more information, see How to: Specify Run Settings.

After you create your load test, you can change your run settings in the Load Test Editor. For more information, see How to: Change the Run Settings.