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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2002, Vol. 3 Issue (1): 60-64    DOI: 10.1631/jzus.2002.0060
Computer & Industrial Engineering     
Algorithms for semi on-line multiprocessor scheduling problems
HE Yong, YANG Qi-fan, TAN Zhi-yi, YAO En-yu
Department of Mathematics, Zhejiang University, Hangzhou 310027, China; Department of System Science & Engeering, Zhejiang University, Hangzhou 310027, China
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Abstract  In the classical multiprocessor scheduling problems, it is assumed that the problems are considered in off-line or on-line environment. But in practice, problems are often not really off-line or on-line but somehow in between. This means that, with respect to the on-line problem, some further information about the tasks is available, which allows the improvement of the performance of the best possible algorithms. Problems of this class are called semi on-line ones. The authors studied two semi on-line multiprocessor scheduling problems, in which, the total processing time of all tasks is known in advance, or all processing times lie in a given interval. They proposed approximation algorithms for minimizing the makespan and analyzed their performance guarantee. The algorithms improve the known results for 3 or more processor cases in the literature.

Key wordsanalysis of algorithm      on-line scheduling      worst-case ratio     
Received: 18 December 2000     
CLC:  TP393  
Cite this article:

HE Yong, YANG Qi-fan, TAN Zhi-yi, YAO En-yu. Algorithms for semi on-line multiprocessor scheduling problems. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2002, 3(1): 60-64.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2002.0060     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2002/V3/I1/60

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