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Quality-of-Service Aware Design and Management of Embedded Mixed-Criticality Systems

Ranjbar, Behnaz | 2024

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  1. Type of Document: Ph.D. Dissertation
  2. Language: English
  3. Document No: 57344 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Ejlali, Alireza; Kumar, Akash
  7. Abstract:
  8. Nowadays, implementing a complex system, which executes various applications with different levels of assurance, is a growing trend in modern embedded real- time systems to meet cost, space, timing, and power consumption requirements. Medical devices, automotive, and avionics industries are the most common safety- critical applications, exploiting these systems known as Mixed-Criticality (MC) systems. MC applications are real-time, and to ensure the correctness of these applications, it is essential to meet strict timing requirements as well as functional specifications. The correct design of such MC systems requires a thorough understanding of the system’s functions and their importance to the system. A failure/deadline miss in functions with various criticality levels has a different impact on the system, from no effect to catastrophic consequences. Failure in the execution of tasks with higher criticality levels (HC tasks) may lead to system failure and cause irreparable damage to the system, while although Low-Criticality (LC) tasks assist the system in carrying out its mission successfully, their failure has less impact on the system’s functionality and does not harm the system itself to fail. This thesis addresses the mentioned challenges associated with efficient MC system design. We first focus on application analysis at run-time and task schedulability to schedule more LC tasks in the system in order to improve the QoS at the end of system execution. Note that the correct execution of HC tasks before their deadline are guaranteed in any situation. Then, this thesis focuses on the challenge of improving the QoS using the parallel feature of multi-core hardware platforms
  9. Keywords:
  10. Mixed-Criticality Emdedded Systems ; Service Quality ; Schedulability ; Utilization ; Resource Utilization ; Timing Overheads

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