Título:
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Deconstructing bus access control policies for real-time multicores
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Autor/a:
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Jalle Ibarra, Javier; Abella Ferrer, Jaume; Quiñones, Eduardo; Fossati, Luca; Zulianello, Marco; Cazorla Almeida, Francisco Javier
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors |
Abstract:
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Multicores may satisfy the growing performance requirements of critical Real-Time systems which has made industry to consider them for future real-time systems. In a multicore, the bus contention-control policy plays a key role in system's performance and the tightness of the Worst-Case Execution Time (WCET) estimates. In this paper we develop analytical models of the contention that requests from different tasks running in different cores suffer for the two most-used contention control policies: Time-Division Multiple Access (TDMA) and Interference-Aware Bus Arbiter (IABA), which allows us to compare them. We further show the benefits of having such models for real-time system designers and chip providers. Our results show that WCET estimates obtained with TDMA are slightly (2%) tighter than those obtained with IABA, at the cost of knowing the exact cycle at which every access of every task accesses the bus. However, average performance is 10% worse with TDMA than with IABA. Overall, IABA is the most appealing contention-control policy since it allows achieving tight WCET estimates and high average performance with little burden for the user. |
Materia(s):
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-Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors -Embedded computer systems -Multiprocessors -Ordinadors immersos, Sistemes d' -Multiprocessadors |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Objeto de conferencia |
Editor:
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Institute of Electrical and Electronics Engineers (IEEE)
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