12.1. System dynamics and workload
An accurate and complete definition of the system’s workload is critical to predicting or understanding its performance. A difference in workload can cause far more variation in the measured performance of a system than differences in CPU clock speed or RAM size. The workload definition must include not only the type and rate of requests to the system but also the exact software packages and in-house application programs to be executed.
Whenever possible, normal usage of existing applications should be observed to get authentic, real-world measurements of the rates at which users interact with their workstations or terminals.
Make sure that you include the work load that your system is doing behind the scenes. ...
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