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Computers 2018, 7(2), 26; https://doi.org/10.3390/computers7020026

Feedback-Based Admission Control for Firm Real-Time Task Allocation with Dynamic Voltage and Frequency Scaling

1
Department of Computer Science, University of York, York YO10 5GH, UK
2
School of Computer Science and Electronic Engineering, University of Essex, Colchester CO4 3SQ, UK
*
Author to whom correspondence should be addressed.
Received: 13 March 2018 / Revised: 12 April 2018 / Accepted: 13 April 2018 / Published: 16 April 2018
(This article belongs to the Special Issue Multi-Core Systems-On-Chips Design and Optimization)
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Abstract

Feedback-based mechanisms can be employed to monitor the performance of Multiprocessor Systems-on-Chips (MPSoCs) and steer the task execution even if the exact knowledge of the workload is unknown a priori. In particular, traditional proportional-integral controllers can be used with firm real-time tasks to either admit them to the processing cores or reject in order not to violate the timeliness of the already admitted tasks. During periods with a lower computational power demand, dynamic voltage and frequency scaling (DVFS) can be used to reduce the dissipation of energy in the cores while still not violating the tasks’ time constraints. Depending on the workload pattern and weight, platform size and the granularity of DVFS, energy savings can reach even 60% at the cost of a slight performance degradation. View Full-Text
Keywords: feedback; admission control; firm real-time; DVFS; MPSoC; task allocation feedback; admission control; firm real-time; DVFS; MPSoC; task allocation
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Dziurzanski, P.; Singh, A.K. Feedback-Based Admission Control for Firm Real-Time Task Allocation with Dynamic Voltage and Frequency Scaling. Computers 2018, 7, 26.

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