This paper investigates how the multi-phase representation of real-time tasks impacts their implementation and the precision of the interference analysis in a multi-core context. In classical scheduling and interference analyses, tasks are represented as a single phase with a duration equal to their Worst-Case Execution Time (WCET) in isolation, annotated with their worst-case number of accesses. We propose a general formal definition of a task model in which tasks are represented as a sequence of such phases: the multi-phase model. We then provide a set of general correction criteria for the implementation of tasks represented in the multi-phase model, which is agnostic of the analysis method applied on the tasks. We also use the multi-phase model on an avionics case-study and study its impact on the interference analysis. Finally, we define a set of efficiency criteria using a statistical study of the most efficient multi-phase shapes.
@InProceedings{meunier_et_al:LIPIcs.ECRTS.2022.9, author = {Meunier, R\'{e}mi and Carle, Thomas and Monteil, Thierry}, title = {{Correctness and Efficiency Criteria for the Multi-Phase Task Model}}, booktitle = {34th Euromicro Conference on Real-Time Systems (ECRTS 2022)}, pages = {9:1--9:21}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-239-6}, ISSN = {1868-8969}, year = {2022}, volume = {231}, editor = {Maggio, Martina}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2022.9}, URN = {urn:nbn:de:0030-drops-163267}, doi = {10.4230/LIPIcs.ECRTS.2022.9}, annote = {Keywords: Task model, Interference, Multicore architectures} }
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