Many parts of this book help you solve the diversity and complexity problems mentioned earlier by helping you quickly determine that large chunks of your computing infrastructure are not the problem.
Load testing can tell you many interesting things, but it can only give you data on the computing infrastructure you have now.

Everything (hardware, operating systems, networking, applications, users, corporate goals, org charts, priorities, and budgets) changes over time and with change comes new performance challenges. Furthermore, there are limits placed on you due to politics, time, budget, legal restrictions, and the tools you have available.

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