| 软件双冗余容错系统的容错能力和性能分析 |
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| 引用本文： | 吴斌,高珑.软件双冗余容错系统的容错能力和性能分析[J].计算机研究与发展,2009,46(Z2). |
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| 作者姓名： | 吴斌 高珑 |
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| 作者单位： | 1. 山东大学计算机科学与技术学院,济南,250014
2. 国防科学技术大学计算机学院,长沙,410073 |
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| 基金项目： | 国家"八六三"高技术研究发展计划基金项目 |
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| 摘 要： | 双冗余是比较常用的冗余容错设计方法.软件双冗余容错系统通过冗余执行完成相同功能的两个软件副本,并检查它们的结果,根据两者结果是否一致来判断是否出现了错误.建立了软件双冗余容错系统的运行时模型,并引入了软件双冗余容错系统的容错能力的概念.根据该模型分析了单个软件副本的容错能力对软件双冗余容错系统的容错能力和性能的影响.分析结果显示,提高单个软件副本的容错能力不仅能够提高软件双冗余容错系统的容错能力,还能够提高系统的性能.但在极端情况下,双冗余容错系统的容错能力也可能会小于单个软件副本的容错能力.
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| 关 键 词： | 软件实现的硬件容错技术 软件双冗余容错系统 软件副本 容错能力 性能 |
Fault Tolerance and Performance Analysis of Software Double Redundant Implemented Hardware Fault Tolerance |
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| Wu Bin,Gao Long.Fault Tolerance and Performance Analysis of Software Double Redundant Implemented Hardware Fault Tolerance[J].Journal of Computer Research and Development,2009,46(Z2). |
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| Authors: | Wu Bin Gao Long |
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| Abstract: | Duplicating is popular in software implemented hardware fault tolerance.Double redundant fault tolerance uses two software replicas with identical function.By comparing the results,double redundancy can detect whether there are errors.In this paper,a run-time model for the double redundancy is set up,and the fault tolerance capability of double redundancy is introduced.Based on the run-time model,the fault tolerance capability and the performance of double redundancy are analyzed.Analysis showed that by improving the fault tolerance capability of individual software replica,both fault tolerance capability and performance of double redundancy can be improved.But under some radical conditions,double redundancy may be less reliable than single software replica. |
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| Keywords: | SIHFT double redundancy software replica fault tolerance capability performance |
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