Visual Studio 2010 supported 64 bit Test Agent which used to allow us to do 64bit test runs as explained here. But Test Controller was capable of running in 32 bit mode only. As a 32 bit process, it was limited to 2GB of memory. This causes scale issues sometimes as QTController process starts throwing Out of Memory exceptions as it approaches 2GB limit. This eventually causes abort of Load Test run....

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Note: Cross posted from Rubel's Blog.
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