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Dynamic scheduling of hard real-time tasks and real-time threads

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2 Author(s)
Schwan, K. ; Coll. of Comput., Georgia Inst. of Technol., Atlanta, GA, USA ; Zhou, H.

The authors investigate the dynamic scheduling of tasks with well-defined timing constraints. They present a dynamic uniprocessor scheduling algorithm with an O(n log n) worst-case complexity. The preemptive scheduling performed by the algorithm is shown to be of higher efficiency than that of other known algorithms. Furthermore, tasks may be related by precedence constraints, and they may have arbitrary deadlines and start times (which need not equal their arrival times). An experimental evaluation of the algorithm compares its average case behavior to the worst case. An analytic model used for explanation of the experimental results is validated with actual system measurements. The dynamic scheduling algorithm is the basis of a real-time multiprocessor operating system kernel developed in conjunction with this research. Specifically, this algorithm is used at the lowest, threads-based layer of the kernel whenever threads are created

Published in:

Software Engineering, IEEE Transactions on  (Volume:18 ,  Issue: 8 )

Date of Publication:

Aug 1992

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