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POHow to go about estimating the hardware required to support X number of users/transactions?
 

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  1. POHow to go about estimating the hardware required to support X number of users/transactions?
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    <p>I am curious as to how do everyone approach the question of the following nature:</p> <p>'we need to create Application A (eg. ecommerce site). It will use technology B (eg. java). It has to support C (eg. 200) number of concurrent users. What kind of hardware do we need?'</p> <p>Hardware specification would involve the number of CPU required, and perhaps amount of memory for a basic answer.</p> <p>To simplify my example, I will stick with Java technology in my question, but I really would like a technology-neutral advice.</p> <p>I understand that such a question involves many additional factors. Eg, a different framework (Wicket vs Struts vs Spring vs pure EJB J2EE architecture), number of distributed tiers (one box setup or 3 tier setup).</p> <p>But given that a person might have no prior experience with the given technology (or maybe no opportunity to do a load test of finding out what the required hardware is), and such a question always comes up during an initial project discussion (and an answer is essential as a baseline to move forward), how do you go about giving an answer?</p> <p>I had thought about solving the memory required problem by estimating the amount of memory each user session might take, but there will definitely be framework/virtual machine overhead. </p> <p>But in general, I just cannot seem to reason out a good solution to this question, which always seem to pop up. A load test would definitely help solve it, but then by that point the project is already ready, and this is a question a client would usually want an answer to before committing to a project.</p> <p>Do hope that the community can advise on good approaches to this.</p> <p>Thanks.</p>
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    1. USKent Lai
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