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《Chinese Journal of Computers》 2007-03
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An Algorithm of Allocating Tasks to Multiprocessors Based on Dynamic Critical Task

LAN Zhou SUN Shi-Xin(College of Computer Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054)  
One of main obstacles in achieving high performance is the scheduling for multiprocessors.Scheduling algorithm based on task duplication is a better way to solve this problem.The authors discuss several recently reported duplication-based scheduling algorithms and propose a novel algorithm.The proposed algorithm,which is called the algorithm of allocating tasks to multiprocessors based on Dynamic Critical Task(DCT),is different from the previously proposed algorithms in a number of ways.Besides a directed acyclic graph(DAG),the gantt graph also is introduced into the scheduling process.Based on the gantt graph DCT algorithm a set of time parameters is put forward to accurately describe the task positions and states.After dynamically computing the task time parameters,DCT algorithm determines the critical tasks of a processor and then optimizes this processor schedule length through duplicating the critical father tasks of the critical tasks to this processor.Once the schedule length is shorter,DCT algorithm determines the critical tasks again for the next scheduling such that DCT algorithm can tackle the drawbacks of the greedy algorithms(e.g.OSA,PPA and CPFD algorithm).DCT algorithm also employs several strategies to reduce the number of processors.The analytical and experimental results show DCT algorithm has advantages over the previously proposed algorithms in terms of the schedule length and the number of processors.
【CateGory Index】: TP338
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1 LIANG Gen1,QIN Yong1,2,GUO Xiao-xue3,LIANG Huo-min4(1.Education Information and Technology Center,Maoming University,Maoming 525000;2.School of Computer Science & Engineering,South China University of Technology,Guangzhou 510641;3.College of Science,Maoming University,Maoming 525000;4.College of Computer Science,South China Normal University,Guangzhou 510631);Task Scheduling in Distributed System Based on Dynamic Multi Processing Nodes[J];Computer Engineering;2009-09
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