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oai:drops-oai.dagstuhl.de:12377 2024-03-06T10:49:50Z ddc:004 open_access

Simultaneous Multithreading and Hard Real Time: Can It Be Safe? Osborne, Sims Hill Anderson, James H. real-time systems simultaneous multithreading hard real-time scheduling algorithms probability statistics timing analysis The applicability of Simultaneous Multithreading (SMT) to real-time systems has been hampered by the difficulty of obtaining reliable execution costs in an SMT-enabled system. This problem is addressed by introducing a scheduling framework, called CERT-MT, that combines scheduling-aware timing analysis with a cyclic-executive scheduler in a way that minimizes SMT-related timing variations. The proposed scheduling-aware timing analysis is based on maximum observed execution times and accounts for the uncertainty inherent in measurement-based timing analysis. The timing analysis is found to work for tasks with and without SMT, though some adjustments are required in the former case. A large-scale schedulability study is presented that shows CERT-MT can schedule systems with total utilizations approaching 1.4 times the core count, without sacrificing safety. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Sims Hill Osborne and James H. Anderson 2020 Is Part Of LIPIcs, Volume 165, 32nd Euromicro Conference on Real-Time Systems (ECRTS 2020) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.ECRTS.2020.14 urn:nbn:de:0030-drops-123778 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2020.14 eng https://creativecommons.org/licenses/by/3.0/legalcode