Analysis and optimisation of distributed embedded systems by by Traian Pop.

By by Traian Pop.

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In order to integrate EDF tasks with FPS, we use the approach in [Gon03], by assuming that FPS priorities are not unique, and that a group of tasks having the same FPS priority on a processor are to be scheduled with EDF. Thus, whenever the FPS scheduler notices ready tasks that share the same priority level, it will invoke the EDF scheduler which will schedule those tasks based on their deadlines. 3 for tasks τ3 and τ4. There can be several such EDF priority levels within a task set on a processor.

Then, in Chapter 6 we present the timing analysis that determines the worst-case response times of messages transmitted over a FlexRay bus. Following a similar line of thought like in the first part of the thesis, Chapter 7 aims again at improving the overall timing characteristics of the system by optimising the structure of the bus cycle. Finally, in Chapter 8 we draw some conclusions and discuss possible research directions for the future. 25 C HAPTER 1 26 S YSTEM M ODEL Chapter 2 System Model I N THIS CHAPTER we present the system model that we use during scheduling and design optimisation.

3 describes the regular schedulability analysis for FPS and EDF tasks sharing the same resources, as developed in [Gon03]. 4 extends the schedulability analysis so that SCS tasks are taken into consideration when computing the response times of FPS and EDF activities. 5 we present our complete scheduling algorithm, which statically schedules the TT activities while trying to minimise the influence of the TT activities onto the ET ones. 6, where we present the experimental results. 36 S CHEDULING AND S CHEDULABILITY A NALYSIS It has to be mentioned that our analysis is restricted, for the moment, to the model in which TT tasks communicate only through ST messages, while communication between ET tasks is performed by DYN messages.

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