| 摘要: |
| DHDF(动态纯数据流)是许多图形化编程平台的核心.由于它的自然属性(数据驱动)与操作系统事件驱动模型不能很好地结合,导致了两个明显的不足:运行效率低,CPU占用率高;对外部事件响应速度慢,系统实时性差.提出了一种ECDF(事件触发并发数据流)模型,并给出了该模型的文法描述以及调度算法.ECDF模型通过引入多优先级线程以及事件触发机制,在很大程度上提高了系统的实时性与运行效率.以测试系统为背景,对有关应用实例进行测试与分析,结果表明,与DHDF模型相比,ECDF模型使系统的性能在不同条件下都得到了相应的提高.该模型特别适用于处理突发性高速数据流,也适用于Reactive系统设计. |
| 关键词: 数据流 图形化编程 虚拟仪器 实时系统 数据流可视化语言 |
| DOI： |
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| 基金项目:Supported by the Key Science-Technology Project of the National 'Ninth Five-Year-Plan' of China under Grant No.97-772-01-06 (国家"九五"重点科技攻关项目) |
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| An Event-Triggered Concurrent Dataflow Model |
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WANG Rui-Rong,WANG Le-Yu
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| Abstract: |
| DHDF (dynamic homogeneous dataflow) is the kernel of most graphic programming platform. For the natural data-driven property, the dynamic homogeneous dataflow can not work properly with the event-driven operating system, which leads to two demerits: one is inefficiency in CPU using, the other is low respond speed and poor in real time performance. An ECDF (event triggered concurrent dataflow) model and its formal description are presented in this paper. Based on multi-thread and event-triggered mechanism, the real time performance and execution efficiency of dataflow-based system are improved. The experimental results of a test system prove that the event-driven concurrent dataflow can ameliorate the performance of dataflow-based system to a certain degree in most conditions comparing with the dynamic homogeneous dataflow model. ECDF model is also suited for the Reactive systems design, and high-speed burst-data flow processing especially. |
| Key words: dataflow graphic programming virtual instrument real-time system dataflow visual language |
