Performance: Simple Theory and Concepts
Note: To understand discussions on performance aspects of IT, it is necessary to have the rudiments of queuing theory under your belt before proceeding, hence the interposing here of a section on simple queuing theory, prior to a more detailed discussion, should you need it, in Appendix I.
Many years ago, it was almost possible to calculate or estimate the performance of a system of a simple server, simple storage, and a single link to end users where performance characteristics were known. Today, the hardware and worlds are far more complex and the workloads more varied with different requirements for performance, and trying to estimate performance numbers ...
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