Group Oriented Distributed Computing


Keywords: group systems, distributed systems, fault tolerance, protocols

Start Date: 1 September 93 / Status: finished / Duration: 32 months

[ participants / contact]

Objectivies and Approach

The collaboration addresses the development of a comprehensive theory of group computation in distributed systems. The European partners intend to combine and extend techniques previously developed for efficient group communication on LANs for use in interconnected networks, to use their previously developed group communication and time and clock synchronisation service (xAMP), and to contribute to the development of real time features for managing time, temporal order and synchronisation in computation and communication for a range of real time applications.

The American partner will work with the European team on a shared system that integrates technologies from both partners. It further intends to provide early access to its new Isis system by defining the interfaces and optimising the techniques necessary for that integration, to furnish the higher-level tools and services developed as part of their communication suite (Isis), and to explore the integration of the virtual synchrony model used by Isis for group membership, cooperation and replication management protocols with the genuinely synchronous model used by INESC, thus aiming towards a single system supporting a full range of real time and logically consistent group mechanisms.

European links: ESPRIT BRA projects BROADCAST (6360), PDCS-2 (6362), PEGASUS (6586), TRANSCOOP (8012), COORDINATION (9102).

Progress and Results

During the first year, the collaboration focused on models and frameworks for large-scale group support, remote and reliable client-server access, group membership and addressing, and lightweight groups. In the second year the work aimed at a comparison between Horus and NavTech for large-scale applications, and at code development. In the last year, the research was directed towards mission-critical real time systems.

Information Dissemination Activities and/or Exploitation

The collaboration led to the publication of ten articles. More information about the project can be found at


R. Alves Redol 9
Apartado 10105

EU Partners

University of Newcastle upon Tyne, UK

Non-EU Partners

Cornell University, USA


Prof. Paulo Verissimo
Tel: +351 1 750 01 03
Fax: +351 1 750 00 84

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GODC - EC-US026, May 1997

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html version of synopsis by Nick Cook