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2012 IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (2012)
Seoul South Korea
Aug. 19, 2012 to Aug. 22, 2012
ISSN: 1533-2306
ISBN: 978-1-4673-3017-6
pp: 358-367
Schedulability for compositional real-time systems has been the focus of a great deal of recent research. In this problem domain, we consider the fixed-priority (FP) scheduling of arbitrary-deadline sporadic task systems upon periodic resources. Existing exact or approximate schedulability tests for dedicated uniprocessor scheduling can be used in this setting by modeling the "no-supply period" of the periodic resource model as a special highest priority task. However, the exact schedulability test is highly inefficient from computational perspective, and the straightforward approximate test is pessimistic due to the approximation on the resource unavailability along with the resource demand. In this paper, along with obtaining an exact characterization of schedulability for this setting, we address the need for efficient and effective schedulability results for the large and important class of arbitrary-deadline task systems by deriving a polynomial-time sufficient schedulability algorithm. By simulations, we show that this algorithm performs very well compared with the exact test, and even better than the approximate test.
Approximation methods, Real time systems, Bismuth, Testing, Approximation algorithms, Computational modeling, Algorithm design and analysis, periodic resources, compositional real-time systems, fixed-priority scheduling

F. Dewan and N. Fisher, "Fixed-Priority Schedulability of Arbitrary-Deadline Sporadic Tasks upon Periodic Resources," 2012 IEEE International Conference on Embedded and Real-Time Computing Systems and Applications(RTCSA), Seoul South Korea, 2012, pp. 358-367.
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