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Static Scheduling of Monoprocessor Real-Time Systems composed of Hard and Soft Tasks
Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, ESLAB - Embedded Systems Laboratory.
Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, ESLAB - Embedded Systems Laboratory.
Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, ESLAB - Embedded Systems Laboratory.
2003 (English)Report (Other academic)
Abstract [en]

In this report we address the problem of static scheduling of real-time systems that include both hard and soft tasks. We consider systems in which both hard and soft tasks are periodic, and our analysis take into account the data dependencies among tasks. In order to capture the relative importance of soft tasks and how the quality of results is affected when missing a soft deadline, we use utility functions associated to soft tasks. Thus our objective is to find a schedule that maximizes the total utility and at the same time guarantees hard deadlines. We use the expected duration of tasks for evaluating utility functions whereas we use the maximum duration of tasks for ensuring that hard deadlines are always met. We show that the problem we study in this report is NP-complete and we present an algorithm that finds the optimal schedule as well as different heuristics that find near-optimal solutions at reasonable computational cost.

Place, publisher, year, edition, pages
Linköping, Sweden: ESLAB, IDA, Linköpings Universitet , 2003.
Keyword [en]
static scheduling, real-time systems, hard tasks, soft tasks, utility function
National Category
Computer Science
Identifiers
URN: urn:nbn:se:liu:diva-23334Local ID: 2765OAI: oai:DiVA.org:liu-23334DiVA: diva2:243648
Available from: 2009-10-07 Created: 2009-10-07

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http://www.ida.liu.se/labs/eslab/publications/pap/db/sch_rep03.pdf

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Cortes, Luis-AlejandroEles, Petru IonPeng, Zebo

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  • harvard1
  • ieee
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  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
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  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • text
  • asciidoc
  • rtf