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What is a Timing Anomaly?

Authors Franck Cassez, René Rydhof Hansen, Mads Chr. Olesen



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Franck Cassez
René Rydhof Hansen
Mads Chr. Olesen

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Franck Cassez, René Rydhof Hansen, and Mads Chr. Olesen. What is a Timing Anomaly?. In 12th International Workshop on Worst-Case Execution Time Analysis. Open Access Series in Informatics (OASIcs), Volume 23, pp. 1-12, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2012)
https://doi.org/10.4230/OASIcs.WCET.2012.1

Abstract

Timing anomalies make worst-case execution time analysis much harder, because the analysis will have to consider all local choices. It has been widely recognised that certain hardware features are timing anomalous, while others are not. However, defining formally what a timing anomaly is, has been difficult. We examine previous definitions of timing anomalies, and identify examples where they do not align with common observations. We then provide a definition for consistently slower hardware traces that can be used to define timing anomalies and aligns with common observations.
Keywords
  • Timing anomalies
  • worst case execution time (WCET)
  • abstractions

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