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Real Time Computing pp 347–371Cite as

Asynchronous Decentralized Realtime Computer Systems

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Part of the book series: NATO ASI Series ((NATO ASI F,volume 127))

Abstract

Realtime computer systems which perform physically and logically decentralized mission management such as collaborative direction within a team of autonomous entities conducting manufacturing, maintenance, or combat must accommodate significant run-time uncertainties in the application environment and system resource state, by being dynamically adaptive. In particular, such systems have mission-critical time constraints which must be satisfied acceptably as specified by the application given the current circumstances.

Thus, they violate the static, deterministic, synchronous premises on which most conventional realtime computing concepts and techniques are founded`. A different paradigm for non-deterministic asynchronous realtime scheduling is being developed. The Benefit Accrual Model is a framework that generalizes the traditional special cases of deadline time constraints, and unanimous optimum as the scheduling criterion, to encompass a wide spectrum of realtime hardness and softness in a unified way. Best-Effort scheduling algorithms exploit this generality. The progenitor of this scheduling paradigm was publicly introduced in the Alpha decentralized realtime OS kernel; and the current version is being incorporated into a new realtime version of the Mach 3.X kernel by Digital Equipment Corp.

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Author information

Authors and Affiliations

  1. Digital Equipment Corporation, 129 Parker St., PKO3-1/22D, Maynard, MA, 01754, USA

    E. Douglas Jensen

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  1. E. Douglas Jensen
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Editor information

Editors and Affiliations

  1. Vakgroep Informatica, Rijksuniversiteit Groningen, Postbus 800, 9700 AV, Groningen, The Netherlands

    Wolfgang A. Halang

  2. Fachbereich Elektrotechnik und Informationstechnik, FernUniversität Hagen, D-58084, Hagen, Germany

    Wolfgang A. Halang

  3. Department of Computer and Information Science, New Jersey Institute of Technology, 07102, Newark, NJ, USA

    Alexander D. Stoyenko

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© 1994 Springer-Verlag Berlin Heidelberg

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Jensen, E.D. (1994). Asynchronous Decentralized Realtime Computer Systems. In: Halang, W.A., Stoyenko, A.D. (eds) Real Time Computing. NATO ASI Series, vol 127. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88049-0_17

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  • DOI: https://doi.org/10.1007/978-3-642-88049-0_17

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-88051-3

  • Online ISBN: 978-3-642-88049-0

  • eBook Packages: Springer Book Archive

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