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ISRN Software Engineering
Volume 2012 (2012), Article ID 681985, 12 pages
Research Article

On-Line Real-Time Service-Oriented Task Scheduling Using TUF

1Electrical and Computer Engineering Department, Florida International University, Miami, FL 33174, USA
2Computer Science Department, Illinois Institute of Technology, Chicago, IL 60616, USA

Received 17 January 2012; Accepted 27 March 2012

Academic Editors: G. Gössler, J. A. Holgado-Terriza, and U. K. Wiil

Copyright © 2012 Shuo Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We present our approach to real-time service-oriented scheduling problems with the objective of maximizing the total system utility. Different from the traditional utility accrual scheduling problems that each task is associated with only a single time utility function (TUF), we associate two different TUFs—a profit TUF and a penalty TUF—with each task, to model the real-time services that not only need to reward the early completions but also need to penalize the abortions or deadline misses. The scheduling heuristics we proposed in this paper judiciously accept, schedule, and abort real-time services when necessary to maximize the accrued utility. Our extensive experimental results show that our proposed algorithms can significantly outperform the traditional scheduling algorithms such as the Earliest Deadline First (EDF), the traditional utility accrual (UA) scheduling algorithms, and an earlier scheduling approach based on a similar model.