NDLI: On the Optimality of RM and EDF for Non-Preemptive Real-Time Harmonic Tasks

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On the Optimality of RM and EDF for Non-Preemptive Real-Time Harmonic Tasks

Content Provider	ACM Digital Library
Author	Kargahi, Mehdi Baruah, Sanjoy Nasri, Mitra Fohler, Gerhard
Abstract	In this paper, we study non-preemptive uniprocessor real-time scheduling using the non-preemptive RM (npRM) and EDF (npEDF) scheduling algorithms. We discuss the limitations of existing studies, identifying pessimism in current schedulability analysis and inefficiencies in existing processor speedup results. Focusing on harmonic task sets, we show that even with restrictions placed on the execution times of the tasks, npRM and npEDF are not able to schedule all feasible task sets. We obtain necessary conditions for the feasibility of the harmonic tasks with arbitrary integer period ratios. Then we derive sufficient conditions for the schedulability of npRM and npEDF upon harmonic task sets. Based on these conditions, a superior speedup factor which guarantees the schedulability in cases where there are fewer restrictions on the execution times is derived. Results from simulation experiments show an average speedup factor three times less than the only existing feasible method to obtain speedup factor.
Starting Page	331
Ending Page	340
Page Count	10
File Format	PDF
ISBN	9781450327275
DOI	10.1145/2659787.2659806
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-10-08
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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