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《Journal of Zhejiang University(Engineering Science)》 2007-12
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Fault tolerant real-time scheduling strategy for NC system based on rollback recovery

PAN Xue-zeng1,YAO Xin-hua2,FU Jian-zhong2,CHEN Zi-chen2(1.College of Computer Science and Technology,Zhejiang University,Hangzhou 310027,China; 2.Institute of Advanced Manufacturing Engineering,Zhejiang University,Hangzhou 310027,China)  
A model for hybrid dependent task set was established to guarantee the time determinability and reliability of numerical control(NC) system,and a fault tolerant real-time scheduling strategy based on rollback recovery and best-first(BF) algorithm was proposed to remove system transient faults.The running result of critical task in NC system was verified by this fault tolerant strategy section by section,and every correct state of checkpoint was saved to restore task from checkpoint with low cost when error was detected.Comparing to traditional fault tolerate scheduling algorithm,the strategy based on rollback recovery is applicable to schedule mixed and dependent tasks of NC system,and raises the level of resources utilization by reducing the cost of fault disposal.The validity of this proposed approach applied to NC system was verified in case study and algorithm simulation.
【CateGory Index】: TG659
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