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Dynamic FTSS in Asynchronous Systems: the Case of Unison

Swan Dubois 1, * Maria Potop-Butucaru 1, * Sébastien Tixeuil 2, * 
* Corresponding author
1 Regal - Large-Scale Distributed Systems and Applications
LIP6 - Laboratoire d'Informatique de Paris 6, Inria Paris-Rocquencourt
2 NPA - Networks and Performance Analysis
LIP6 - Laboratoire d'Informatique de Paris 6
Abstract : Distributed fault-tolerance can mask the effect of a limited number of permanent faults, while self-stabilization provides forward recovery after an arbitrary number of transient fault hit the system. FTSS protocols combine the best of both worlds since they are simultaneously fault-tolerant and self-stabilizing. To date, FTSS solutions either consider static (i.e. fixed point) tasks, or assume synchronous scheduling of the system components. In this paper, we present the first study of dynamic tasks in asynchronous systems, considering the unison problem as a benchmark. Unison can be seen as a local clock synchronization problem as neighbors must maintain digital clocks at most one time unit away from each other, and increment their own clock value infinitely often. We present many impossibility results for this difficult problem and propose a FTSS solution when the problem is solvable that exhibits optimal fault containment.
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Submitted on : Thursday, February 10, 2011 - 3:40:59 PM
Last modification on : Wednesday, October 26, 2022 - 8:16:19 AM
Long-term archiving on: : Wednesday, May 11, 2011 - 3:13:53 AM


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  • HAL Id : inria-00379904, version 2
  • ARXIV : 0904.4615


Swan Dubois, Maria Potop-Butucaru, Sébastien Tixeuil. Dynamic FTSS in Asynchronous Systems: the Case of Unison. [Research Report] ???. 2009, pp.34. ⟨inria-00379904v2⟩



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