A Non-Preemptive Scheduling Algorithm for Soft Real-Time Systems

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This article discusses a non-preemptive scheduling algorithm for soft real-time systems.

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18 p.

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Li, Wenming; Kavi, Krishna M. & Akl, Robert G. April 10, 2006.

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This article is part of the collection entitled: UNT Scholarly Works and was provided by UNT College of Engineering to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 594 times , with 4 in the last month . More information about this article can be viewed below.

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This article discusses a non-preemptive scheduling algorithm for soft real-time systems.

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18 p.

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Abstract: Real-time systems are often designed using preemptive scheduling and worst-case execution time estimates to guarantee the execution of high priority tasks. There is, however, an interest in exploring non-preemptive scheduling models for real-time systems, particularly for soft real-time multimedia applications. In this paper, we propose a new algorithm that uses multiple scheduling strategies for efficient non-preemptive scheduling of tasks. The goal is to improve the success ratio of the well-known Earliest Deadline First (EDF) approach when the load on the system is very high and to improve the overall performance in both underloaded and overloaded conditions. Our approach, known as group EDF (gEDF) is based on dynamic grouping of tasks with deadlines that are very close to each other, and using Shortest Job First (SJF) technique to schedule tasks within the group. We present results comparing gEDF with other real-time algorithms including EDF, Best-effort, and Guarantee, by using randomly generated tasks with varying execution times, release times, deadlines and tolerance to missing deadlines, under varying workloads. We believe that grouping tasks dynamically with similar deadlines and utilizing a secondary criteria, such as minimizing the total execution time (or other metrics such as power or resource availability) for scheduling tasks within a group, can lead to new and more efficient real-time scheduling algorithms.

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  • Computers and Electrical Engineering, 2006. New York: Elsevier Science Ltd., pp. 1-18

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  • Publication Title: Computers and Electrical Engineering
  • Volume: 33
  • Issue: 1
  • Page Start: 1
  • Page End: 18
  • Peer Reviewed: Yes

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UNT Scholarly Works

Materials from the UNT community's research, creative, and scholarly activities and UNT's Open Access Repository. Access to some items in this collection may be restricted.

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  • April 10, 2006

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  • Jan. 24, 2011, 2:10 p.m.

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  • April 1, 2015, 4:02 p.m.

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Li, Wenming; Kavi, Krishna M. & Akl, Robert G. A Non-Preemptive Scheduling Algorithm for Soft Real-Time Systems, article, April 10, 2006; [New York, New York]. (digital.library.unt.edu/ark:/67531/metadc30824/: accessed July 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Engineering.