| 基于NTP的时钟调整策略分析 |
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| 引用本文： | 赵英,王旖旎,马严,李文生.基于NTP的时钟调整策略分析[J].小型微型计算机系统,2008,29(10). |
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| 作者姓名： | 赵英 王旖旎 马严 李文生 |
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| 作者单位： | 1. 北京化工大学,信息科学与技术学院,北京,100029
2. 北京邮电大学,计算机科学与技术学院,北京,100876 |
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| 基金项目： | 国家自然科学基金，教育部科学技术研究项目 |
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| 摘 要： | 时钟同步是分布式系统中的经典问题.本文采用本地节点的时间信息和来自于参考时钟服务器的时间戳信息构造时钟偏差趋势方程,并利用线性拟合方法建立时钟漂移率数学模型.提出采用拟合偏差方法进行时钟调整的策略,以有效克服网络延迟和抖动对时钟同步的影响.实验证明该策略不仅有效减少了本地节点的非必须时钟调整次数,提高了客户端时钟同步的稳定性,并且对网络传输性能较差环境下的时钟同步有更好的适应性.
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| 关 键 词： | 网络 时钟同步 漂移率 拟合偏差 最小二乘法 |
Analysis of Clock Adjusting Strategy Based on NTP |
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| ZHAO Ying,WANG Yi-ni,MA Yan,LI Wen-sheng.Analysis of Clock Adjusting Strategy Based on NTP[J].Mini-micro Systems,2008,29(10). |
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| Authors: | ZHAO Ying WANG Yi-ni MA Yan LI Wen-sheng |
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| Affiliation: | ZHAO Ying1,WANG Yi-ni1,MA Yan2,LI Wen-sheng2 1(School of Information Science , Technology,Beijing University of Chemical Technology,Beijing 100029,China)2(School of Computer Science , Technology,Beijing University of Posts , Telecommunications,Beijing 100876,China) |
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| Abstract: | The Clock Synchronization is a classical problem of distributed systems.This paper adopts the local time of slave node and the arrival timestamps,from the reference server,to create offset trend equation,and a mathematic model of clock drift rate is created by a method of linear fit.A strategy of fitting offset to adjust time is proposed to conquer the impact of network delay and jitter on clock synchronization effectively.The result proves that it not only can reduce the unnecessary times of clock adjustin... |
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| Keywords: | network clock synchronization drift rate fitting offset least square method |
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