Quirks and Challenges in the Design and Verification of Efficient, High-Load Real-Time Software Systems

International audienceExisting concepts for ensuring the correctness of the timing behavior of real-time systems are often based on schedulability analysis methods using exact proofs. Due to the complexity of the scheduling problem, today typically worst case approximations are used to judge the reliability of the timing behavior in software systems. In industrial practice, however, this leads to large safety margins in the design of products which are commercially unacceptable in many application domains. For such highly-efficient systems, schedulability analysis methods that are too pessimistic are of limited benefit. As a consequence, penetration of real-time analysis is suboptimal in the industrial software development, which possibly leads to insufficient quality of the developed products. Therefore, new approaches are needed to support the design and validation of high-load real-time systems with an average CPU load of 90% or above to improve the situation