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The Polling Effect on the Schedulability of Distributed Real-Time Systems

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Reliable Software Technologies – Ada-Europe 2016 (Ada-Europe 2016)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 9695))

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Abstract

The usage of polling tasks continues to be quite common in today’s distributed real-time systems, despite the availability of event-driven software mechanisms and response time analysis techniques that can be applied to this kind of systems. This paper proposes a model for polling tasks that allows current response time analysis techniques for event-driven distributed systems to be applied, and it also studies the impact that polling has in the schedulability of a distributed system, using analytic results. A performance evaluation on an Ada-based platform is also provided. As expected, polling produces response times much higher than a pure event-driven alternative. The analysis techniques and the evaluation presented in the paper allows engineers to assess the negative effect of polling on the schedulability of distributed real-time systems.

This work has been funded in part by the Spanish Government and FEDER funds under grant numbers TIN2011-28567-C03-02 (HI-PARTES) and TIN2014-56158-C4-2-P (M2C2).

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Notes

  1. 1.

    In the application of the HOSPA algorithm the following configurations parameters have been used in the MAST tool 1.5.1.0: (1) Ka = (0.25, 2.00, 3.00) and Kr = (1.50, 2.00, 3.00) for Scn3, and (2) Ka = (1.50, 2.00, 3.00) and Kr = (0.50, 2.00, 3.00) for Scn2 and Scn4.

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Authors and Affiliations

  1. Software Engineering and Real-Time Group, Universidad de Cantabria, 39005, Santander, Spain

    Héctor Pérez, J. Javier Gutiérrez, Michael González Harbour & J. Carlos Palencia

Authors
  1. Héctor Pérez
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  2. J. Javier Gutiérrez
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  3. Michael González Harbour
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  4. J. Carlos Palencia
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Corresponding author

Correspondence to J. Javier Gutiérrez .

Editor information

Editors and Affiliations

  1. Università di Modena e Reggio Emilia, Modena, Italy

    Marko Bertogna

  2. CISTER Research Centre, Porto, Portugal

    Luis Miguel Pinho

  3. Barcelona Supercomputing Center, Barcelona, Spain

    Eduardo Quiñones

Appendix

Appendix

The priority assignments used in the different scenarios are depicted in Tables 6 and 7. A priority range between 1 and 13 has been used for the assignment in each processing resource. The higher the number the higher the priority.

Table 6. Priorities assigned in [13] used in all scenarios, and priorities assigned by MAST for Scn1, Scn2 and Scn3
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Table 7. Priorities assigned by MAST for Scn4 with and without polling overhead
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Pérez, H., Gutiérrez, J.J., González Harbour, M., Palencia, J.C. (2016). The Polling Effect on the Schedulability of Distributed Real-Time Systems. In: Bertogna, M., Pinho, L., Quiñones, E. (eds) Reliable Software Technologies – Ada-Europe 2016. Ada-Europe 2016. Lecture Notes in Computer Science(), vol 9695. Springer, Cham. https://doi.org/10.1007/978-3-319-39083-3_12

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