Resumo

ALFONSI, Alfonso; PEREZ, Jesús  e  DUNIA, Emery. CONTROL ARCHITECTURE FOR DYNAMIC ADJUSTMENT OF ENERGY CONSUMPTION IN REAL-TIME TASKS. Saber [online]. 2013, vol.25, n.2, pp.202-209. ISSN 1315-0162.

The work is geared to processor power management with scaling voltage/frequency dynamic, taking advantage of the dynamic slack time (DST) caused by the variability of the computation times of the of real time control task of i in the activation period k (Ci,k), periodic hard, through a power aware multirate feedback scheduling architecture. Each task was characterized as a local control, taking as reference the processor load factor (UT) at different periods, incorporating multirate control techniques, and DST handling as those associated with Ci,k worst case or WCET and update UT. It takes a set of tasks for benchmark, a base processor with frequency range of 150 MHz to 1000 MHz, and vary the percentage of Ci,k consumed and UT, distributing to each task speeds globally, with expand and skip operators, giving energy savings of 10% to 55.3%. Additionally, on a local scale, with hold and skip operators an anergy saving of 20.74% to 61.04%. It is concluded that the system is adapted to the variability constraints Ci,k,a dynamic feature of real-time tasks. The distribution of the UT and DST due WCET is naturally operated by the feedback loop. This contribution promotes the development and use of technologies for sustainability.

Palavras-chave : Dynamic slack time; energy aware; multirate control; real-time feedback scheduling.

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