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Hiding Communication Delays in Contention-Free Execution for SPM-Based Multi-Core Architectures

Authors Benjamin Rouxel , Stefanos Skalistis , Steven Derrien, Isabelle Puaut

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Author Details

Benjamin Rouxel
  • Univ Rennes, Inria, CNRS, IRISA, France
Stefanos Skalistis
  • Univ Rennes, Inria, CNRS, IRISA, France
Steven Derrien
  • Univ Rennes, Inria, CNRS, IRISA, France
Isabelle Puaut
  • Univ Rennes, Inria, CNRS, IRISA, France

Funding

This work was partially supported by ARGO (http://www.argo-project.eu/), funded by the European Commission under Horizon 2020 Research and Innovation Action, Grant Agreement Number 688131.

Cite AsGet BibTex

Benjamin Rouxel, Stefanos Skalistis, Steven Derrien, and Isabelle Puaut. Hiding Communication Delays in Contention-Free Execution for SPM-Based Multi-Core Architectures. In 31st Euromicro Conference on Real-Time Systems (ECRTS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 133, pp. 25:1-25:24, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2019)
https://doi.org/10.4230/LIPIcs.ECRTS.2019.25

Abstract

Multi-core systems using ScratchPad Memories (SPMs) are attractive architectures for executing time-critical embedded applications, because they provide both predictability and performance. In this paper, we propose a scheduling technique that jointly selects SPM contents off-line, in such a way that the cost of SPM loading/unloading is hidden. Communications are fragmented to augment hiding possibilities. Experimental results show the effectiveness of the proposed technique on streaming applications and synthetic task-graphs. The overlapping of communications with computations allows the length of generated schedules to be reduced by 4% on average on streaming applications, with a maximum of 16%, and by 8% on average for synthetic task graphs. We further show on a case study that generated schedules can be implemented with low overhead on a predictable multi-core architecture (Kalray MPPA).

Subject Classification

ACM Subject Classification
  • Computer systems organization → Embedded and cyber-physical systems
  • Computer systems organization → Real-time systems
Keywords
  • Real-time Systems
  • Contention-Free Scheduling
  • SPM multi-core architecture

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