Isabelle Puaut

Professor, University of Rennes I

Isabelle Puaut

Contact information

IRISA, ALF Research Group

Postal address: IRISA Campus universitaire de Beaulieu 35042 Rennes Cédex FRANCE
E-mail address: Isabelle Puaut
Room: E-309
Telephone: +33 02 99 84 73 10
Fax number: +33 02 99 84 71 71



My current research interests are the field of real-time systems, mostly on estimation of upper bounds of execution times of tasks (what we call in the community WCET estimation – Worst-Case Execution Time Estimation). You may also be interested by our open-source static WCET estimation tool Heptane.

My former research interests included distributed systems, parallel programming, distributed shared memories and fault-tolerant systems. Over the years I’ve worked on distributed systems (PhD thesis on distributed garbage collection in object-oriented languages), parallel systems (Distributed Shared memories), fault-tolerant real-time systems.

I am  « Habilitée à Diriger des Recherches » since november  2001 (listen to my talk – sorry, I speak french -, get the document describing my research activities – also in french, have a look at the pictures).


PC membership

  • PC member of ECRTS 2016 (Toulouse, France)
  • PC member of ECRTS 2015 (Lund, Sweden, July 2015), RTNS 2015 (Lille, France, October 2015), RTCSA 2015 (Honh-Kong, China, August 2015)
  • PC member of RTAS 2014 (Berlin, Germany, April 2014)
  • PC member of RTNS 2013 (Nice, France, October 2013) , ECRTS 2013 (Paris, France, July 2013), RTCSA 2013 (Taipei, Taiwan, August 2013).
  • PC member of ECRTS 2012 (Pisa, Italy, July 2012), LCTES 2012 (Beijing, China, June 2012), ETFA 2012, CARI 2012, ICESS 2012, RTCSA 2012.
  • PC member of ECRTS 2011 (Porto, Portugal, July 2011), RTAS 2011 (Chicago, IL, USA, April 2011), DATE 2011 (Grenoble, France, March 2011), RTSS 2011.
  • PC member of RTSS 2010 (San Diego, CA, USA),  ECRTS10 (Brussels, Belgium), July 2010, RTAS 2010 (Stockholm, Sweden, April 2010), JTRES 2010 (Prague, Czech republic, August 2010), RTNS 2010 (Toulouse, France, November 2010), real-time track of ETFA 2010 (Bilbao, Spain, September 2010), WCET 2010 (Brussels, Belgium, July 2010), RTCSA 2010 (Macau, August 2010).
  • PC member of RTSS09 (Washington D.C. December 2009), RTNS09, (Paris, France, October 2009), RTCSA 2009, (Beijing, China, August 2009), WCET 09, Real-Time and (Networked) Embedded Systems at ETFA 2009,
  • PC chair of ECRTS09, Dublin, Ireland, July 2009
  • Chair of the work in progress session of RTSS 2008, Barcelona, Spain, December 2008
  • General chair of RTNS08 (16th International Conference on Real-Time and Network Systems), Rennes France.
  • PC member ot ECRTS08, RTCSA08, Real-Time and (Networked) Embedded Systems at ETFA 2008 , WCET08 (held in conjunction with ECRTS08).
  • PC member of RTSS2007 (Real-Time Systems Symposium), DATE07 (Design Automation and Test Europe), RTNS07 (15th Real-Time Systems and Networks Conference),
  • PC member of RTSS2006 (Real-Time Systems Symposium), ECRTS2006
  • PC member of the Euromicro Conference on Real-Time systems ECRTS2003, ECRTS2004, ECRTS2005, ECRTS2006, ECRTS2007
  • Organizer of the WCET2004 Workshop (4th International Workshop on Worst-Case Execution Time Analysis)
  • PC member of WCET2005 and WCET2006
  • PC member of International Symposium on Object-Oriented Real-Time Distributed Computing ISORC1999, ISORC2000, ISORC2002, ISORC2003, ISORC2007
  • PC member of RTNS06 (Real-Time Systems and Networks Conference), RTS05, and RTS04
  • PC member of LCTES’04 (ACM Sigplan Conference on Languages, Compilers and Tools for Embedded Systems)
  • PC chair of CFSE4 (4th french Conference on Operating Systems)
  • PC member the french Conference on Operating Systems CFSE1, CFSE3, CFSE4, CFSE5
  • PC member of the 8th Workshop on Parallel and Distributed Real Time Systems (WPDRTS2000)


  • Member of the steering committee of the WCET workshop, held in cunjunction with the ECRTS conference
  • Member of the steering committee of the RTNS conference
  • Member of the Euromicro technical commitee on real-time systems
  • Member of the Executive Committee (EC) of the IEEE Technical Committee on Real-Time Systems (TCRTS)

Current PhD students

  • Viet Anh Nguyen (since january 2015): WCET for many core architectures. Co-supervized by Damien Hardy (50%).
  • Benjamin Rouxel (since october 2015): Code optimizations for tight worst-case execution times (WCETs) on many-core architecturesCo supervized by Steven Derrien (30 %).

Former PhD students

  • Hanbing Li: Extraction and Traceability of Annotations for WCET Estimation. Co-supervized by Erven Rohou (50%). October 2015. manuscript (in english)
  • André Oliveira-Maroneze: Verified compilation and Worst-Case Execution Time Estimation. Co-supervized (and mainly supervized) by Sandrine Blazy. manuscript (in english)
  • Benjamin Lesage: Analysis and design of WCET-friendly multi-core architectures. Co-supervised by André Seznec. May 2013. manuscript (in french).
  • Damien Hardy. WCET estimation for multi-core architectures with shared caches. December 2010. manuscript (in french)
  • Jean-François Deverge Predictability and worst-case execution time (WCET) analysis of modern processors (cache analysis, control of scratchpad memory contents, july 2008 – manuscript. Now with GE Heathcare France, Paris
  • Alexis Arnaud: Utilisation prévisible de caches d’instructions dans les systèmes temps réel (predictable usage of instruction caches in hard real-time systems), april 2006 – manuscript.pdf. Now with Iponweb, Moscow.
  • David Decotigny : simulation and performance evaluation of real-time systems, defended in april 2003, résumé (1166946 octets) – fichier.pdf (2302195 octets). Now with IN2P3 – CNRS,  spent one year with the Stanford Linear Accelerator Center.
  • Antoine Colin : Static Worst-Case Execution Time (WCET) Analysis and its application to real-time operating systems
    Estimation de temps d’exécution au pire-cas et application aux systèmes d’exploitation temps réel – oct 2001 – fichier.pdf. Now with Rapita systems, York, UK.
  • Pascal Chevochot : fault-tolerance in distributed hard real-time systems
    Conception de systèmes distribués temps-réel strict tolérants aux fautes – december 1999, (888997 octets) – fichier.pdf (1642173 octets). Now with Sogitec, Rennes, France.
  • Gilbert Cabillic : Fault-tolerance and load balancing in distributed shared memories
    Exécution d’applications parallèles sur architectures distribuées hétérogènes : proposition et mise en oeuvre. (576539 octets). Now with INRIA, detached at Texas Instruments R&D center – Rennes, France (up to 2007).


  • Operating systems – first year of master studies
  • Real-time systems (lessons and laboratory) – first year of master studies
  • Performances and Micro-Architecture
  • Writing of scientific publications (and beyond): slides


  • Real-time quizz, presented by Giorgio Buttazzo and myself for the 25th anniversary of ECRTS 2013. You only have to  guess which real-time concept is illustrated on each slide. If you send me your answers, I’ll send you back your grades (NB: 19/20 questions have been answered correctly during the reception at the conference).
  • My pictures on flickr:

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