All About Caching and How Visual Studio Simulates Browser Caches

Simulation of Browser Caching during load tests In a VS load test that contains Web tests, the load test attempts to simulate the caching behavior of the browser.  Here are some notes on how that is done: There is a property named on each request in a Web test named “Cache Control” in the Web…

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How to Export Perfmon Counter Values from the Visual Studio Load Test Results Database

How Are Perfmon Results Stored When Visual Studio collects perfmon data during a load test, it stores the data in the SQL database using four tables that allow it to normalize the data into a relational hierarchy. The four tables are: Dbo.LoadTestPerformanceCounterCategory – holds the list of machine names and counter category names (such as…

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How many vUsers can my machine run?

I just love this question. It has such a simple answer…. Right? (uh, yeah. Sure). You can start off with this post from the product group (http://msdn.microsoft.com/en-us/library/ff937706.aspx) , which is as good a starting place as any, but as a teammate just said “That’s sort of a ‘Your Mileage May Vary’ answer. Right?” Yep, it is….

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Explanation of V.S. Load Test warm-up, load patterns, and cool-down, and how this affects the reported results

These graphs show what test iterations are stored and reported in the results of a Visual Studio load test based on the load pattern and warmup used. It is important to note the following things when considering the results: If the test’s active run settings is set to store “All Individual Details” then all iterations…

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Explanation of “Off-Box Inclusive Testing” and how it impacts results and troubleshooting

Explanation of “Off-Box Inclusive testing” and how it impacts troubleshooting An “Off-Box” request is any request that is made by a client to a machine that is not part of the core environment. As an example, if a user opens Internet Explorer and goes to the main Contoso.com website, Internet Explorer will go to the…

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Random Data Generator

This tool is used to create realistic random data for use in performing load testing. It includes a PowerPoint that discusses the importance of good data and includes information about how the tool generates data you can use. RandomDataGenerator.zip

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