Adaptive Fault Tolerance In Real time Systems


Keywords: fault tolerance, real time systems, adaptive mechanism

Start Date: 1 January 94 / Status: finished / Duration: 36 months

[ participants / contact]

Objectivies and Approach

The main technical objective is to develop adaptive fault tolerant systems that dynamically address real time constraints. This will build on a model for fault tolerant entities for real time computing (FERTs) that allows highly flexible management of redundancy and specification and control of timing constraints. Careful consideration has been given to the off-line and runtime support required to perform time-constrained scheduling and other tasks such as delivery of inputs to redundant copies.

European links: ESPRIT BRA project PDCS 2 (6362), project GUARDS (20716), LTR project DeVa (20072).

Progress and Results

In the first two years, several questions concerning the specification, analysis and runtime implementation support for adaptive fault tolerance under real time constraints have been addressed. In more details, they include: refinements of the basic structure of the FERT model in terms of investigations on its feasibility using features of advanced existing real time kernels, and of definition of a communication semantics and communication failure semantics for the FERT entities; scheduling/planning issues, including the planning of task groups and flexible scheduling mechanisms; studies on how to define criteria for distinguishing various possible trade-offs among different and contrasting attributes (like timeliness, reliability, cost and performance) in dependable real time systems; development of a composability approach to adaptive fault tolerance based on FERT entities; preparation of a synthetic benchmark suite for adaptive hard real time systems and investigation of predictability under dynamic reconfiguration after faults.

Information Dissemination Activities and/or Exploitation

Within the project, five papers have been presented at conferences and workshops. Moreover, a chapter of the book "Advances in Real time Systems", Prentice Hall, 1995, has been written by members of the working group.


Consiglio Nazionale delle Ricerche
Istituto di Elaborazione della Informazione
Via Santa Maria, 46
I - 56126 PISA, I

EU Partners

CNR-Pisa, I
University of York, UK

Non-EU Partners

University of Massachussets-Amherst, USA


Dr. Felicita Di Giandomenico
Tel: +39 50 593 443
Fax: +39 50 554 342

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AFERT - EC-US041, May 1997

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html version of synopsis by Nick Cook