Experience in Performance Analysis of Large Real-Time Systems

In this paper, we discuss the experience we gained during three performance engineering projects that we did in co-operation with telecommunication industry. In each of the projects, we analyzed the performance of a real-time system, which has large embedded software. Each system was at a different stage of development. We used three different modeling techniques: Queueing networks, execution graphs, and message sequence charts. We also applied different approaches of building models. To give guidelines for analyzing large systems, we discuss our method of analysis, rationale for choices we made, and the lessons we learned. 1. Introduction In this paper, we discuss performance analysis of large realtime systems. The discussion is based on three case studies; each of which were performance analyses of telecommunication systems. The performance analyses of the systems were done in close co-operation with Finnish telecommunication industry. All the analyzed systems were embedded telecomm..