Efficient Computation of Buffer Capacities for Cyclo-Static Dataflow Graphs

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    Abstract

    A key step in the design of cyclo-static real-time systems is the determination of buffer capacities. In our multi-processor system, we apply back-pressure, which means that tasks wait for space in output buffers. Consequently buffer capacities affect the throughput. This requires the derivation of buffer capacities that both result in a satisfaction of the throughput constraint, and also satisfy the constraints on the maximum buffer capacities. Existing exact solutions suffer from the computational complexity that is associated with the required conversion from a cyclo-static dataflow graph to a single-rate dataflow graph. In this paper we present an algorithm, with polynomial computational complexity, that does not require this conversion and that obtains close to minimal buffer capacities. The algorithm is applied to an MP3 play-back application that is mapped on our multi-processor system. For this application, we see that a cyclo-static dataflow model can reduce the buffer capacities by 50% compared to a multi-rate dataflow model.
    Original languageUndefined
    Place of PublicationEnschede
    PublisherCentre for Telematics and Information Technology (CTIT)
    Number of pages6
    Publication statusPublished - 22 Nov 2006

    Publication series

    NameCTIT Technical Report Series
    PublisherCentre for Telematics and Information Technology, University of Twente
    No.06-70
    ISSN (Print)1381-3625

    Keywords

    • EWI-7659
    • CAES-EEA: Efficient Embedded Architectures
    • IR-66538
    • METIS-238699

    Cite this

    Wiggers, M. H., Bekooij, M. J. G., & Smit, G. J. M. (2006). Efficient Computation of Buffer Capacities for Cyclo-Static Dataflow Graphs. (CTIT Technical Report Series; No. 06-70). Enschede: Centre for Telematics and Information Technology (CTIT).