Capabilities of the UML Profile for Schedulability Performance and Time (SPT)

The authors are performance specialists with experience in software engineering, and contributors to the definition of the performance sub-profile of the UML SPT Profile [6]. Our viewpoint is that the profile should be usable in everyday practice by software developers. We have used it in a dozen examples and have found it largely effective. Our domain is distributed systems for telecom and business, with variable (stochastic) workloads and statistical real-time performance requirements, such as a deadline for a stated percentile of response completions. However, we have also considered schedulability of more deterministic systems. Here we comment on the strengths of the Profile, and additional capabilities that could be added to the next version.