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Documents authored by Raymond, Pascal

Document
DOI: 10.4230/LITES-v006-i001-a002
Improving WCET Evaluation using Linear Relation Analysis

Authors: Pascal Raymond, Claire Maiza, Catherine Parent-Vigouroux, Erwan Jahier, Nicolas Halbwachs, Fabienne Carrier, Mihail Asavoae, and Rémy Boutonnet

Published in: LITES, Volume 6, Issue 1 (2019). Leibniz Transactions on Embedded Systems, Volume 6, Issue 1

Abstract
The precision of a worst case execution time (WCET) evaluation tool on a given program is highly dependent on how the tool is able to detect and discard semantically infeasible executions of the program. In this paper, we propose to use the classical abstract interpretation-based method of linear relation analysis to discover and exploit relations between execution paths. For this purpose, we add auxiliary variables (counters) to the program to trace its execution paths. The results are easily incorporated in the classical workflow of a WCET evaluator, when the evaluator is based on the popular implicit path enumeration technique. We use existing tools - a WCET evaluator and a linear relation analyzer - to build and experiment a prototype implementation of this idea.
Cite as

Pascal Raymond, Claire Maiza, Catherine Parent-Vigouroux, Erwan Jahier, Nicolas Halbwachs, Fabienne Carrier, Mihail Asavoae, and Rémy Boutonnet. Improving WCET Evaluation using Linear Relation Analysis. In LITES, Volume 6, Issue 1 (2019). Leibniz Transactions on Embedded Systems, Volume 6, Issue 1, pp. 02:1-02:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@Article{raymond_et_al:LITES-v006-i001-a002,
  author =	{Raymond, Pascal and Maiza, Claire and Parent-Vigouroux, Catherine and Jahier, Erwan and Halbwachs, Nicolas and Carrier, Fabienne and Asavoae, Mihail and Boutonnet, R\'{e}my},
  title =	{{Improving WCET Evaluation using Linear Relation Analysis}},
  journal =	{Leibniz Transactions on Embedded Systems},
  pages =	{02:1--02:28},
  ISSN =	{2199-2002},
  year =	{2019},
  volume =	{6},
  number =	{1},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LITES-v006-i001-a002},
  doi =		{10.4230/LITES-v006-i001-a002},
  annote =	{Keywords: Worst Case Execution Time estimation, Infeasible Execution Paths, Abstract Interpretation}
}
Document
DOI: 10.4230/OASIcs.WCET.2017.9
The W-SEPT Project: Towards Semantic-Aware WCET Estimation

Authors: Claire Maiza, Pascal Raymond, Catherine Parent-Vigouroux, Armelle Bonenfant, Fabienne Carrier, Hugues Cassé, Philippe Cuenot, Denis Claraz, Nicolas Halbwachs, Erwan Jahier, Hanbing Li, Marianne de Michiel, Vincent Mussot, Isabelle Puaut, Christine Rochange, Erven Rohou, Jordy Ruiz, Pascal Sotin, and Wei-Tsun Sun

Published in: OASIcs, Volume 57, 17th International Workshop on Worst-Case Execution Time Analysis (WCET 2017)

Abstract
Critical embedded systems are generally composed of repetitive tasks that must meet hard timing constraints, such as termination deadlines. Providing an upper bound of the worst-case execution time (WCET) of such tasks at design time is necessary to guarantee the correctness of the system. In static WCET analysis, a main source of over-approximation comes from the complexity of the modern hardware platforms: their timing behavior tends to become more unpredictable because of features like caches, pipeline, branch prediction, etc. Another source of over-approximation comes from the software itself: WCET analysis may consider potential worst-cases executions that are actually infeasible, because of the semantics of the program or because they correspond to unrealistic inputs. The W-SEPT project, for "WCET, Semantics, Precision and Traceability", has been carried out to study and exploit the influence of program semantics on the WCET estimation. This paper presents the results of this project : a semantic-aware WCET estimation workflow for high-level designed systems.
Cite as

Claire Maiza, Pascal Raymond, Catherine Parent-Vigouroux, Armelle Bonenfant, Fabienne Carrier, Hugues Cassé, Philippe Cuenot, Denis Claraz, Nicolas Halbwachs, Erwan Jahier, Hanbing Li, Marianne de Michiel, Vincent Mussot, Isabelle Puaut, Christine Rochange, Erven Rohou, Jordy Ruiz, Pascal Sotin, and Wei-Tsun Sun. The W-SEPT Project: Towards Semantic-Aware WCET Estimation. In 17th International Workshop on Worst-Case Execution Time Analysis (WCET 2017). Open Access Series in Informatics (OASIcs), Volume 57, pp. 9:1-9:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{maiza_et_al:OASIcs.WCET.2017.9,
  author =	{Maiza, Claire and Raymond, Pascal and Parent-Vigouroux, Catherine and Bonenfant, Armelle and Carrier, Fabienne and Cass\'{e}, Hugues and Cuenot, Philippe and Claraz, Denis and Halbwachs, Nicolas and Jahier, Erwan and Li, Hanbing and de Michiel, Marianne and Mussot, Vincent and Puaut, Isabelle and Rochange, Christine and Rohou, Erven and Ruiz, Jordy and Sotin, Pascal and Sun, Wei-Tsun},
  title =	{{The W-SEPT Project: Towards Semantic-Aware WCET Estimation}},
  booktitle =	{17th International Workshop on Worst-Case Execution Time Analysis (WCET 2017)},
  pages =	{9:1--9:13},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-057-6},
  ISSN =	{2190-6807},
  year =	{2017},
  volume =	{57},
  editor =	{Reineke, Jan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2017.9},
  URN =		{urn:nbn:de:0030-drops-73097},
  doi =		{10.4230/OASIcs.WCET.2017.9},
  annote =	{Keywords: Worst-case execution time analysis, Static analysis, Program analysis}
}
Document
DOI: 10.4230/OASIcs.WCET.2013.32
Program Semantics in Model-Based WCET Analysis: A State of the Art Perspective

Authors: Mihail Asavoae, Claire Maiza, and Pascal Raymond

Published in: OASIcs, Volume 30, 13th International Workshop on Worst-Case Execution Time Analysis (2013)

Abstract
Advanced design techniques of safety-critical applications use specialized development model based methods. Under this setting, the application exists at several levels of description, as the result of a sequence of transformations. On the positive side, the application is developed in a systematic way, while on the negative side, its high-level semantics may be obfuscated when represented at the lower levels. The application should provide certain functional and non-functional guarantees. When the application is a hard real-time program, such guarantees could be deadlines, thus making the computation of worst-case execution time (WCET) bounds mandatory. This paper overviews, in the context of WCET analysis, what are the existing techniques to extract, express and exploit the program semantics along the model-based development workflow.
Cite as

Mihail Asavoae, Claire Maiza, and Pascal Raymond. Program Semantics in Model-Based WCET Analysis: A State of the Art Perspective. In 13th International Workshop on Worst-Case Execution Time Analysis. Open Access Series in Informatics (OASIcs), Volume 30, pp. 32-41, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2013)

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@InProceedings{asavoae_et_al:OASIcs.WCET.2013.32,
  author =	{Asavoae, Mihail and Maiza, Claire and Raymond, Pascal},
  title =	{{Program Semantics in Model-Based WCET Analysis: A State of the Art Perspective}},
  booktitle =	{13th International Workshop on Worst-Case Execution Time Analysis},
  pages =	{32--41},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-54-5},
  ISSN =	{2190-6807},
  year =	{2013},
  volume =	{30},
  editor =	{Maiza, Claire},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2013.32},
  URN =		{urn:nbn:de:0030-drops-41209},
  doi =		{10.4230/OASIcs.WCET.2013.32},
  annote =	{Keywords: survey, WCET analysis, program semantics, model-based design, infeasible paths}
}
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