Real-time Embedded Systems: Optimization, Synthesis, and by Meikang Qiu

By Meikang Qiu

Ubiquitous in today’s consumer-driven society, embedded structures use microprocessors which are hidden in our daily items and designed to accomplish particular initiatives. powerful use of those embedded structures calls for engineers to be educated in all stages of this attempt, from making plans, layout, and research to production and marketing.

Taking a systems-level technique, Real-Time Embedded structures: Optimization, Synthesis, and Networking describes the sphere from 3 targeted elements that make up the 3 significant tendencies in present embedded method design.

The first element of the textual content examines optimization in real-time embedded platforms. The authors current scheduling algorithms in multi-core embedded structures, teach on a powerful dimension opposed to the incorrect info that may exist in embedded platforms, and talk about power difficulties of heterogeneous optimization. the second one part makes a speciality of synthesis-level methods for embedded platforms, together with a scheduling set of rules for section switch reminiscence and scratch pad reminiscence and a therapy of thermal-aware multiprocessor synthesis expertise. the ultimate part appears to be like at networking with a spotlight on activity scheduling in either a instant sensor community and cloud computing. It examines the merging of networking and embedded structures and the ensuing evolution of a brand new kind of approach often called the cyber actual approach (CPS).

Encouraging readers to find how the pc interacts with its atmosphere, Real-Time Embedded platforms provides a legitimate creation to the layout, production, advertising, and destiny instructions of this significant tool.

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Extra resources for Real-time Embedded Systems: Optimization, Synthesis, and Networking

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92, 91] propose the concept of probabilistic design where they design the system to meet the timing constraints of periodic applications statistically. But their algorithm is not optimal and only suitable to uniprocessor executing tasks according to a fixed order, that is, a simple path. Dynamic voltage scaling (DVS) is one of the most effective techniques to reduce energy consumption [53, 187, 244, 180, 52]. In many microprocessor systems, the supply voltage can be changed by mode-set instructions according to the workload at run-time.

1, that is, cmin (Gf ) = max(5, 4) = 5. Then it proves that it is impossible to find a schedule with cycle period < 5 with f = 2. This is a very clear and strong result. 2 Let G = V, E, d, t be a data flow graph, f an unfolding factor, P a given iteration period constraint. The following statements are equivalent: 1. There exists a legal static schedule of unfolded graph Gf with iteration period less than or equal to P . 2. B(G) ≤ cmin (Gf )/f ≤ P . 34 Real-Time Embedded Systems: Optimization, Synthesis, and Networking As to the previous example, assume that we want to achieve an average iteration period P = 7/3, and we would like to know what unfolding factor is possible for achieving this requirement.

The iteration bound of this graph is therefore 1 21 . It is clear that unfolding will increase code size significantly. We want to find the minimum f with retiming r so the iteration period of the resultant loop schedule is optimal. But it is very likely that such an optimal f is too large for the program to fit into a small-size on-chip memory; then we need to explore what will be good f , r, schedule and code size. 2 Timing Optimization The relations between retiming, unfolding and scheduling were explored by Sha et al.

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