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计算机工程

• 人工智能及识别技术 • 上一篇    下一篇

FTT调度模型中面向性能优化的消息周期指定算法

张艳明  1,姚宏亮  2   

  1. (1.合肥学院网络与智能信息处理重点实验室,合肥 230601;2.合肥工业大学计算机与信息学院,合肥 230009)
  • 收稿日期:2014-10-24 出版日期:2015-12-15 发布日期:2015-12-15
  • 作者简介:张艳明(1977-),男,实验师、硕士,主研方向:人工智能,分布控制;姚宏亮,副教授、博士。
  • 基金资助:
    国家自然科学基金资助项目(61175051,61175033);国家“973”计划基金资助项目(2013CB329604)。

Messages Period Assignment Algorithm Oriented to Performance Optimization in Flexible Time-triggered Scheduling Model

ZHANG Yanming  1,YAO Hongliang  2   

  1. (1.Key Laboratory of Network and Intelligent Information Processing,Hefei University,Hefei 230601,China; 2.School of Computer and Information,Hefei University of Technology,Hefei 230009,China)
  • Received:2014-10-24 Online:2015-12-15 Published:2015-12-15

摘要: 针对周期可变的实时消息集,建立柔性时间触发调度模型下消息周期与系统性能的优化模型,并给出解析取整和贪心选择2种消息周期近似最优指定算法。在此基础上,提出结合OptInt与Greed 2种算法的Comb算法。Comb算法通过利用OptInt算法获得较好的初始解,运用Greed 算法对初始解进行二次优化,实现OptInt与Greed2种算法的有效组合。理论分析与仿真实验结果表明,Comb算法具有Greed算法步骤简单、算法复杂度低的优点,在保证消息集可调度前提下,能有效地优化系统的整体性能。

关键词: 柔性时间触发, 网络控制系统, 周期性实时消息, 基本周期, 周期指定

Abstract: Aiming at real-time messages set with variable period,a mathematical optimization model which expresses the relation between the system performance and the period of messages scheduling by Flexible Time-Triggered(FTT) model is presented.Two algorithms which are called OptInt and Greed respectively are given to find the nearly optimal solution to the period assignment problem.In addition,a new algorithm named as Comb is proposed by combing the two algorithms together,which uses the OptInt algorithm to find the initial solution and improves it with the Greed algorithm.Theoretical analysis and simulation results show that compared with OpInt and Greed algorithms,the Comb algorithm is simple and has lower computation complexity and better optimization effect.

Key words: Flexible Time-Triggered(FTT), network control system, periodic real-time message, Elementary Cycle(EC), period assignment

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