We’ve had a number of users report OutOfMemoryExceptions occurring in the QTAgent process (or the VSTestHost process when running locally). There can be several different causes of the OutOfMemoryExceptions. This article attempts to help diagnose and prevent these problems. First a bit of background...

The beta for Visual Studio 2008 SP1 is now available. This article describes enhancements to the VSTS Load Test API for use by a LoadTestPlugin that have been added in this update. For complete details on changes and bugs fixes in this release, see Ed Glas's blog post at: http://blogs.msdn.com/edglas...

The beta for Visual Studio 2008 SP1 is now available. This article describes enhancements to the VSTS Web test API that have been added in this update. For complete details on changes and bugs fixes in this release, see Ed Glas's blog post at: http://blogs.msdn.com/edglas/archive/2008/05/27/vs-2008-sp1...

In VSTS 2008, it is now possible to easily export load test results from one test environment and import them into a load test results database on another machine using the Load Test Run as described in this blog post by Sean Lumley: http://blogs.msdn.com/slumley/pages/managing-load-test-results.aspx...

VSTS allows you to use the Console.WriteLine within unit tests, but the output is only valid when doing a single pass of the unit test. When running the unit test in a load test, there is no built in mechanism for outputting comments or data. The following routines will allow you to track custom messages...

First some background on how IP Switching works with VSTS, which may differ from other load test tools you have used: Many other load testing tools that support IP Switching (also known as IP spoofing) require you to add the IP addresses to the network interface card (NIC) manually, and then the IP...

This article describes the behavior in VS 2008 for load tests that contain unit tests (VS 2005 was slightly different in some respects). Instances of unit test classes in a load test Each time an iteration of a unit test is run in a load test, a new instance of the unit test class is instantiated...

Normally the number of iterations of the inner tests (usually web tests and unit tests) run during a Visual Studio Team System (VSTS) load test is determined by the duration of the load test. However, some users which to control the number of inner test iterations exactly. There is not direct support...

Table: LoadTestRun : Contains one row for each load test that is executed. Columns: LoadTestRunId (int): A unique Id for this load test run in this load test results store. The value is 1 for the first load test and increments for each load test that is executed. All of the tables in the load...

Visual Studio Team System load tests do not have a "sync point" feature that lets a load tester specify that some number of test instances for different virtual users should all sync up at the same point of execution in the test. However, with some caveats it is possible to implement sync points in...

Visual Studio Team Test Edition provides two capabilities that can allow users to create load tests of web sites quickly and easily: the Web Test recorder and the Load Test wizard. In fact, these tools make this process so easy that it is tempting to use the web tests and the load tests that result from...