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Quantifying the sub-optimality of uniprocessor fixed-priority scheduling

Abstract : There are sporadic task systems schedulable by EDF, which no fixed-priority (FP) algorithm can schedule successfully. For instance, it is known that while all implicit-deadline sporadic task systems with utilization at most one are EDF-schedulable on a unit-capacity uniprocessor, there are implicit-deadline sporadic task systems that are not schedulable by any FP algorithm, and have utilization exceeding ln 2 (approx. 0.69) by an arbitrarily small amount. A quantitative metric of the relative effectiveness of fixed-priority scheduling of constrained-deadline sporadic task systems is derived here, which generalizes this well-known 0.69 utilization bound for implicit-deadline systems.
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https://hal.inria.fr/inria-00336484
Contributor : Anne Jaigu <>
Submitted on : Tuesday, November 4, 2008 - 11:31:10 AM
Last modification on : Wednesday, August 21, 2019 - 10:38:02 AM
Long-term archiving on: : Monday, June 7, 2010 - 10:43:07 PM

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Sanjoy Baruah, Alan Burns. Quantifying the sub-optimality of uniprocessor fixed-priority scheduling. 16th International Conference on Real-Time and Network Systems (RTNS 2008), Isabelle Puaut, Oct 2008, Rennes, France. ⟨inria-00336484⟩

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