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DOI: 10.4230/OASIcs.WCET.2009.2292

Extending the Path Analysis Technique to Obtain a Soft WCET

Authors: Paul Keim, Amanda Noyes, Andrew Ferguson, Joshua Neal, and Christopher Healy

Published in: OASIcs, Volume 10, 9th International Workshop on Worst-Case Execution Time Analysis (WCET'09) (2009)

Abstract

This paper discusses an efficient approach to statically compute a WCET that is "soft" rather than "hard". The goal of most timing analysis is to determine a guaranteed WCET; however this execution time may be far above the actual distribution of observed execution times. A WCET estimate that bounds the execution time 99% of the time may be more useful for a designer in a soft real-time environment. This paper discusses an approach to measure the execution time distribution by a hardware simulator, and a path-based timing analysis approach to derive a static estimation of this same distribution. The technique can find a soft WCET for loops having any number of paths.

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Paul Keim, Amanda Noyes, Andrew Ferguson, Joshua Neal, and Christopher Healy. Extending the Path Analysis Technique to Obtain a Soft WCET. In 9th International Workshop on Worst-Case Execution Time Analysis (WCET'09). Open Access Series in Informatics (OASIcs), Volume 10, pp. 1-9, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{keim_et_al:OASIcs.WCET.2009.2292,
  author =	{Keim, Paul and Noyes, Amanda and Ferguson, Andrew and Neal, Joshua and Healy, Christopher},
  title =	{{Extending the Path Analysis Technique to Obtain a Soft WCET}},
  booktitle =	{9th International Workshop on Worst-Case Execution Time Analysis (WCET'09)},
  pages =	{1--9},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-14-9},
  ISSN =	{2190-6807},
  year =	{2009},
  volume =	{10},
  editor =	{Holsti, Niklas},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2009.2292},
  URN =		{urn:nbn:de:0030-drops-22922},
  doi =		{10.4230/OASIcs.WCET.2009.2292},
  annote =	{Keywords: WCET analysis, soft real-time, path-based, distribution}
}

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Extending the Path Analysis Technique to Obtain a Soft WCET

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