Performance Analysis of Soft Real-Time Systems

نویسندگان

  • M. Rooholamini
  • Seyed Hossein Hosseini
چکیده

We model a gracefully degrading mul-tiprocessor soft real-time system which is subject to both dynamic (software) and static (hardware) failures, without recovery, using a Markov process. We derive the traditional reliability performance measure and meantime to failure (MTTF) of such a system with respect to both failure types and introduce a parameter, expected-deadline-missed, which is the expected number of tasks that miss their deadlines per time unit at every processor, due to dynamic failures in the presence of faulty hardware components. Based on this parameter, we deene three performance measures suitable for analysis of real-time systems, deadline-missed-reliability, deadline-missed-before-failure, and deadline-missed-time-reliability.

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تاریخ انتشار 1997