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Dynamic and Static Task Allocation for Hard Real-Time Video Stream Decoding on NoCs

Authors Hashan R. Mendis, Neil C. Audsley, Leandro Soares Indrusiak

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Hashan R. Mendis
  • University of York
Neil C. Audsley
  • University of York
Leandro Soares Indrusiak
  • University of York

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Hashan R. Mendis, Neil C. Audsley, and Leandro Soares Indrusiak. Dynamic and Static Task Allocation for Hard Real-Time Video Stream Decoding on NoCs. In LITES, Volume 4, Issue 2 (2017). Leibniz Transactions on Embedded Systems, Volume 4, Issue 2, pp. 01:1-01:25, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017) https://doi.org/10.4230/LITES-v004-i002-a001

Abstract

Hard real-time (HRT) video systems require admission control decisions that rely on two factors. Firstly, schedulability analysis of the data-dependent, communicating tasks within the application need to be carried out in order to guarantee timing and predictability. Secondly, the allocation of the tasks to multi-core processing elements would generate different results in the schedulability analysis. Due to the conservative nature of the state-of-the-art schedulability analysis of tasks and message flows, and the unpredictability in the application, the system resources are often under-utilised. In this paper we propose two blocking-aware dynamic task allocation techniques that exploit application and platform characteristics, in order to increase the number of simultaneous, fully schedulable, video streams handled by the system. A novel, worst-case response time aware, search-based, static hard real-time task mapper is introduced to act as an upper-baseline to the proposed techniques. Further evaluations are carried out against existing heuristic-based dynamic mappers. Improvements to the admission rates and the system utilisation under a range of different workloads and platform sizes are explored.

Subject Classification

ACM Subject Classification
  • Hardware → On-chip resource management
Keywords
  • Real-time multimedia
  • Task mapping
  • Network-on-chip

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