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1.8 Interactions and Dependencies between Performance Engineering and Other Activities

Performance engineering is an iterative process involving interactions between multiple sets of stakeholders at many stages of the software lifecycle (see Figure 1.1). The functional requirements inform the specification of the performance requirements. Both influence the architecture and the choice of technology. Performance requirements may be formulated with the help of performance models. The models are used to plan performance tests to verify scalability and that performance requirements have been met. Performance models may also be used in the design of modifications. Data gathered through performance monitoring and capacity planning may be used to determine whether new functionality or load may be added to the system.

Figure 1.1

Figure 1.1 Interactions between performance engineering activities and other software lifecycle activities

The performance engineer must frequently take responsibility for ensuring that these interactions take place. None of the activities and skills we have mentioned is sufficient for the practice of performance engineering in and of itself.

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