An Analysis of Preemptive Multiprocessor Job Scheduling
The preemptive scheduling of a partially ordered set of tasks is studied. A class of scheduling heuristics is introduced, and the performance of schedules in this class is analyzed with respect to the least finishing time optimality criterion. If there are m processors, then the finishing time of an...
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| Published: |
2023
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| Online Access: | https://hdl.handle.net/1721.1/148938 |
| Summary: | The preemptive scheduling of a partially ordered set of tasks is studied. A class of scheduling heuristics is introduced, and the performance of schedules in this class is analyzed with respect to the least finishing time optimality criterion. If there are m processors, then the finishing time of any schedule in the class is at most √m + (1/2) times worse than optimal, independent of the speeds of the processors. Examples are given which indicate that there are schedules whcih may be as bad as √m-1 times worse than optimal even for machines with one fast processor. |
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