【摘要】 研究了具有模糊截止期的多控制任务的实时调度问题,提出了奉献度的概念和最大奉献优先(LDF)的调度策略.为了减小因任务间频繁切换造成的系统开销,提出了基于抢占阈值的最大奉献优先(TLDF)调度策略.最后,通过仿真比较了LDF和TLDF两种调度策略,实现了具有模糊截止期的控制任务调度,在减少并均衡控制性能损失的同时提高系统计算资源的使用率.更多还原

【Abstract】 In order to improve the control performance of systems and use the limited computing resource reasonably,it is necessary to consider the codesign problem between control and real-time scheduling in computer-controlled systems synthetically.In this paper,the real-time scheduling problem of multiple control tasks with fuzzy deadlines is studied.The concept of dedication index and the scheduling policy of largest dedication first(LDF) are proposed.In order to relieve the overhead caused by the thrashing among tasks,the threshold-based largest dedication first(TLDF) is presented.Finally,Two proposed scheduling policies LDF and TLDF are compared by simulation.The scheduling of control tasks with fuzzy deadlines is implemented,and the utilization of computing resource gets increased meanwhile the control performance cost gets decreased and tradeoff.更多还原