局域网环境网络时间协议性能测试.doc

局域网环境的网络时间协议性能测试 摘要:网络时间协议(ntp)能够实现多节点时间和频率同步，具有简单、经济和高效等特点，但在性能测试方面的相关研究不多，使得在实际系统中是否采用ntp时缺乏参考数据。针对这一问题，开展了局域网环境下的ntp性能测试，分析了系统负载和网络负载对ntp性能的影响。在实际系统中，通过比较irig.b时码卡和getlocaltime windows api返回的时间，近似获取了计算机基准时钟信号的频率偏差，该误差值与ntp测算的结果基本一致，表明本地一级ntp服务器时间同步和频率同步性能良好。对ntp的实际应用和windows平台下时间敏感应用程序的设计提供了参考。 关键词:网络时间协议；时间同步；频率同步；性能测试；线性拟合 network time protocol performance evaluation in lan environment chen chao.fu1,2*, wang lei1( 1.institute of applied electronics, china academy of engineering physics, mianyang sichuan 621900, china; 2.graduate school, china academy of engineering physics, mianyang sichuan 621900, chinaabstract: network time protocol (ntp) is a simple, economic and efficient way to accomplish time and frequency synchronization of multiple nodes, while performance evaluation related work is hard to find in literature, making whether to use ntp in application an uneasy task. aiming at this problem, local network ntp performance, and impact of system / network load, are measured and analyzed on windows platform. by comparing time value obtained from irig-b time code reader and getlocaltime windows api, frequency skew of computer clock signal is approximated. the skew value is close to the value calculated by ntp. these conclusions can provide reference for ntp practice and time-sensitive application design on windows platform. network time protocol (ntp) is a simple, economic and efficient way to accomplish time and frequency synchronization of multiple nodes, while relevant study on the performance evaluation is hard to find in literature, which makes it a question whether to use ntp in application. concerning this problem, the local network ntp performance and impact of system / network load were measured and analyzed on windows platform. by comparing time value obtained from irig.b time code reader and getlocaltime windows api, frequency skew of computer clock signal was approximated. the skew value was close to the value calculated by ntp. these conclusions