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The Risks Of Testing in Scaled Performance Environments

Posted Mon, 12/05/2011 - 4:52pm by Jason Buksh

This article will explain the risks associated with using a scaled (aka downsized) environment for Performance Testing. I’ve been a little off topic lately and I thought I would jump back into the realms of Performance Testing. I thought I would attempt to answer one of the most complicated questions I’m faced with when Load Testing. The question is this “If we half the size of the performance/load testing environment can’t we just multiple the figures up?” This is a straightforward question and the answer is simple – ‘NO’. But justifying the answer and explaining in simple terms is more difficult. Particularly to PM’s and people not directly attached to the technology. So I’m going to attempt to answer in simple terms why scaled load testing environments tend not to work and highlight the risks to be considered when using them. Point people at this article if you struggle to answer this question – and let me know what they think.

performance testing scaled downFirst lets take an object: A square – if we half the square, do we get half the size? Well yes and no – the square is half the size, but its capacity is 1/4 of the original square.

This is a very simplistic view - but it illustrates if the environment is ‘halved’ the capacity will not. I’m setting the scene so please bear with me …..

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