In this chapter we explore the following topics:
• The essential role and desirable properties of performance metrics
• The distinction between metrics based on sample statistics and metrics based on time averaging
• The need for performance metrics to inform us about the problem domain, and how they occur in different types of systems
• Desirable properties of performance metrics
It is essential to describe the performance of a system in terms that are commonly understood and unambiguously defined. Performance should be defined in terms that aid the understanding of the system from both engineering and business perspectives. A great deal of time can be wasted because of ambiguities in quantitative ...