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WCET and Mixed-Criticality: What does Confidence in WCET Estimations Depend Upon?

Authors Sebastian Altmeyer, Björn Lisper, Claire Maiza, Jan Reineke, Christine Rochange

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Sebastian Altmeyer
Björn Lisper
Claire Maiza
Jan Reineke
Christine Rochange

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Sebastian Altmeyer, Björn Lisper, Claire Maiza, Jan Reineke, and Christine Rochange. WCET and Mixed-Criticality: What does Confidence in WCET Estimations Depend Upon?. In 15th International Workshop on Worst-Case Execution Time Analysis (WCET 2015). Open Access Series in Informatics (OASIcs), Volume 47, pp. 65-74, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)
https://doi.org/10.4230/OASIcs.WCET.2015.65

Abstract

Mixed-criticality systems integrate components of different criticality. Different criticality levels require different levels of confidence in the correct behavior of a component. One aspect of correctness is timing. Confidence in worst-case execution time (WCET) estimates depends on the process by which they have been obtained. A somewhat naive view is that static WCET analyses determines safe bounds in which we can have absolute confidence, while measurement-based approaches are inherently unreliable. In this paper, we refine this view by exploring sources of doubt in the correctness of both static and measurement-based WCET analysis.
Keywords
  • mixed criticality
  • WCET analysis
  • confidence in WCET estimates

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