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Graceful Degradation in Semi-Clairvoyant Scheduling

Authors Sanjoy Baruah, Pontus Ekberg

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Author Details

Sanjoy Baruah
  • Washington University in Saint Louis, MO, USA
Pontus Ekberg
  • Uppsala University, Sweden

Funding

  • Baruah, Sanjoy: National Science Foundation Grants CNS-1814739 and CPS-1932530.
  • Ekberg, Pontus: Swedish Research Council grant 2018-04446.

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Sanjoy Baruah and Pontus Ekberg. Graceful Degradation in Semi-Clairvoyant Scheduling. In 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 196, pp. 9:1-9:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.ECRTS.2021.9

Abstract

In the Vestal model of mixed-criticality systems, jobs are characterized by multiple different estimates of their actual, but unknown, worst-case execution time (WCET) parameters. Some recent research has focused upon a semi-clairvoyant model for mixed-criticality systems in which it is assumed that each job reveals upon arrival which of its WCET parameters it will respect. We study the problem of scheduling such semi-clairvoyant systems to ensure graceful degradation of service to less critical jobs in the event that the systems exhibit high-criticality behavior. We propose multiple different interpretations of graceful degradation in such systems, and derive efficient scheduling algorithms that are capable of ensuring graceful degradation under these different interpretations.

Subject Classification

ACM Subject Classification
  • Computer systems organization → Embedded and cyber-physical systems
  • Software and its engineering → Real-time schedulability
Keywords
  • Mixed criticality
  • semi-clairvoyance
  • graceful degradation

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References

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