分布交互式仿真中的高性能时钟设计问题研究  

Design of High Performance Clock Used in Distributed Interactive Simulation System

作　　者：薛芳侠[1] 姚益平[2] 谢虹[1] 闫了了[1] 

机构地区：[1]中国人民解放军63880部队 [2]国防科技大学计算机学院

出　　处：《计算机仿真》2006年第5期115-118,共4页Computer Simulation

摘　　要：时空一致性是分布交互式仿真的关键问题,联网仿真的计算机之间的的时间同步必须达到一定的精度,而计算机的时钟分辨率是制约仿真系统时间同步精度的重要因素。在W indows2000/NT操作系统下PC机系统时钟的分辨率较低,且时间漂移率较高,因此在使用PC机和W indows2000/NT操作系统的分布交互式仿真系统中,如果使用系统时钟,时间同步精度不可能很高,如果为每台PC机加装高性能外部时钟的话,不但会增加系统成本,而且也不利于系统扩展。该文提出了一种基于PC机性能计数器的高分辨率、低时间漂移时钟的设计方案,解决了分布交互式仿真系统基于PC机自身资源获取高性能时钟的问题。In distributed interactive simulation systems, time/space coherence is one of the key factors. The time synchronization accuracy between the computers must be reached to some degree, and the time resolution of computer g clock is the main factor that restricts the time synchronization accuracy. Because Windows 2000/NT＇s system time resolution is insufficient and time drift ratio is high, the time synchronization accuracy in distributed interactive simulation systems which use PCs and Windows 2000/NT cant be very good if using the system time, and if installing a external high performance clock for each PC to get high time synchronization, the cost will increase and the system＇s scalability will be downgraded. In this paper, a new project based on PC＇s performance counter is raised. The new clock＇s time resolution is high and the time drift ratio is low, as a result,the problem of getting a high performance clock based on the resource of PC＇s is resolved.

关 键 词：性能计数器 频率漂移 时间漂移 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]