| Simulation and Improvement of the Processing Subsystem of the Manchester Dataflow Computer |
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| 作者姓名： | Lai Zhiyong Zheng Shouqi |
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| 作者单位： | Lai Zhiyong (Accounting Department，Management School，Xi'an Jiaotong University，Xi，an 710049)Zheng Shouqi(Computer Department，Electronic and Information Engineering SchoolXi'an Jiaotong University，Xi'an 710049) |
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| 摘 要： | The Manchester dataflow computer is a famous dynamic dataflow computer.It is centralized in architecture and simple in organization.Its overhead for communication and scheduling is very small.Its efficiency comes down,when processing elements in the processing subsystem increase.Several articles evaluated its performance and presented improved methods.The authors studied its processing subsystem and carried out the simulation.The simulation results show that the efficiency of the processing subsystem drops dramatically when average instruction execution microcycles become less and the maximum instruction execution rate is nearly attained.Two improved methods are presented to oversome the disadvantage.The improved processing subsystem with a cheap distributor made up of a bus and a two-level fixed priority circuit possesses almost full efficiency no matter whether the average nstruction execution microcycles number is large or small and even if the maximum instruction execution rate is approached.
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| 关 键 词： | 数据流计算机 处理子系统 分配器 |
Simulation and improvement of the processing subsystem of the Manchester dataflow computer |
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| Lai Zhiyong,Zheng Shouqi.Simulation and Improvement of the Processing Subsystem of the Manchester Dataflow Computer[J].Journal of Computer Science and Technology,1995,10(6):557-563. |
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| Authors: | Zhiyong Lai Shouqi Zheng |
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| Affiliation: | Accounting Department; Management School; Xi'an Jiaotong University; Xi; an 710049; Computer Department; Electronic and Information Engineering SchoolXi'an Jiaotong University; Xi'an 710049; |
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| Abstract: | The Manchester dataflow computer is a famous dynamic dataflow computer.It is centralized in architecture and simple in organization. Its overhead for communication and scheduling is very small. Its efficiency comes down, when processing elements in the processing subsystem increaJse. Several articles eval uated its performance and presented improved methods. The authors studied its processing subsystem and carried out the simulation. The simulation rer sults show that the efficiency of the processing subsystem drops dramatically when average instruction execution microcycles become less and the maximum instruction execution rate is nearly attained. Two improved methods are pre-sented to overcome the disadvantage. The improved processing subsystem with a cheap distributor made up of a bus and a twthlevel fixed priority circuit pos-sesses almost full efficiency no matter whether the average instruction execution microcycles number is large or small and even if the mtalmum instruction execution rate is approached. |
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| Keywords: | Dataflow computer processing subsystem distributor efficiency maximum instruction execution rate |
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