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Get Soft Real-Time Systems: Predictability vs. Efficiency PDF

By Giorgio C Buttazzo, Giuseppe Lipari, Luca Abeni, Marco Caccamo

ISBN-10: 0387237011

ISBN-13: 9780387237015

A few of us can keep in mind while Springer and Wiley technical books have been superbly performed. not more. There are a few sturdy papers within the publication however the construction is negative; affordable paper, undesirable offset printing, vulnerable binding, asymmetric ink circulation, no editorial realization whatever. Get the unique papers off the net. do not hassle with this e-book. it's going to collapse on your arms.

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Extra resources for Soft Real-Time Systems: Predictability vs. Efficiency (Series in Computer Science)

Sample text

It is worth noting that the elastic model is more general than the classical Liu and Layland's task model, so it does not prevent a user from defining hard real-time tasks. In fact, a task having T,,r,tz, = T,,, is equivalent to a hard real-time task with fixed period, independently of its elastic coefficient. A task with E , = 0 can arbitrarily vary its period within its specified range, but it cannot be varied by the system during load reconfigurations. To understand how an elastic guarantee is performed in this model, it is convenient to compare an elastic task r, with a linear spring S, characterized by a rigidity coefficient k,.

In RHD, the task with the , )scheduled first, regardless of its deadline. 8. ,, against RED and RHD. deadlines into account. However, for high load conditions (p even better than RED and Do,,,.. 5),RHD performs In particular, for random task sets, Do,,, is less effective than RED and RHD for two reasons: first, it does not have a reclaiming mechanism for recovering rejected tasks in the case of early completions; second, the threshold value used in the rejection policy is set to reach the best competitive factor in a worst-case scenario.

This class includes those algorithms in which the load on the processor is controlled by an acceptance test executed at each task arrival. Typically, whenever a new task enters the system, a guarantee routine verifies the schedulability of the task set based on worst-case assumptions. If the task set is found schedulable, the new task is accepted in the ready queue; otherwise, it is rejected. Robust Scheduling. This class includes those algorithms that separate timing constraints and importance by considering two different policies: one for task acceptance and one for task rejection.

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Soft Real-Time Systems: Predictability vs. Efficiency (Series in Computer Science) by Giorgio C Buttazzo, Giuseppe Lipari, Luca Abeni, Marco Caccamo


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