网络控制系统改进EDF调度策略研究  

Research on Improved EDF SchedulingStrategy in Networked Control System

作　　者：蒋凯 田中大[1] JIANG Kai;TIAN Zhong-da(College of Artificial Intelligence,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学人工智能学院,辽宁沈阳110870

出　　处：《电脑知识与技术》2021年第25期7-10,共4页Computer Knowledge and Technology

摘　　要：针对网络中传输任务动态变化的属性,对传统的最早截止期优先(EDF)调度策略进行优化,以任务变化的周期和执行时间为基准提出改进的EDF精确化调度策略。从可调度条件出发,利用任务的执行时间和周期的分布函数,结合精确化处理方法,对变化的时间进行合理的取值,从而得到精确的时间属性值并以此进行任务传输。克服了传统调度策略中优先级混乱导致传输性能下降的缺陷,且继承了传统策略的资源利用率高的优点。通过仿真证明改进的EDF调度策略有效提高了网络控制系统的调度性能。In view of the dynamic changes of transmission tasks in the network,the traditional earliest deadline priority(EDF)sched⁃uling strategy is optimized,and an improved EDF precision scheduling strategy is proposed based on the cycle and execution time of task changes.Starting from schedulable conditions,using the distribution function of task execution time and period,combined with precision processing methods,the changing time is reasonably valued,so that the accurate time attribute value is obtained and the task transmission is carried out.It overcomes the defect of reduced transmission performance caused by priority confusion,and inherits the advantages of high resource utilization of the traditional strategy.The Simulation proves that this method effectively im⁃proves the scheduling performance of the networked control system.

关 键 词：网络控制系统 EDF 动态变化 精确化 调度 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]