A semi-preemptive priority scheduling discipline: Performance analysis |
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Authors: | Joris Walraevens Tom Maertens Herwig Bruneel |
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Affiliation: | Ghent University (UGent), Department of Telecommunications and Information Processing (TELIN), SMACS Research Group, Belgium |
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Abstract: | In this paper, we present an in-depth analytical study of a semi-preemptive priority scheduling discipline. This discipline eliminates the deficits of both the full- and non-preemptive versions. Under the non-preemptive category, in particular, higher-priority customers may have to wait even when the service of a lower-priority customer has just started, while under the full-preemptive discipline, the almost completed service of a lower-priority customer may be interrupted due to the arrival of higher-priority customers, possibly causing a large extra delay. For fixed low-priority service times, the semi-preemptive priority scheduling discipline shows a performance gain of up to 6% compared to the full- and non-preemptive versions. |
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Keywords: | Priority scheduling (Non-)preemptive Performance analysis Cost function |
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