While network simulation is a widely used technique for developing, testing and evaluating network protocols and applications, it is difficult and time-consuming to develop detailed models of the entire protocol stack and the application that is being evaluated. Hybrid component networks combine simulation models of protocols and applications with physical implementations of other protocols and/or applications, which can alleviate modeling complexity and build accurate models. However, hybrid component networks require that the simulated components execute faster than real time. Parallel simulation techniques can greatly improve the performance of hybrid component networks and facilitate evaluation of larger networks than would feasible only with sequential execution. In parallel simulation, one of the most important properties to be exploited from the simulation is "lookahead," but none of the previous studies has exploited the lookahead from the physical implementation of protocols or applications. We have developed Virtual Socket Interface (VSI), which exploits real time lookahead from the interactions between operational applications and simulated networks in GloMoSim [1], a parallel discrete event network simulator. This paper presents the implementation of VSI with the notion of real time lookahead and evaluates VSI for typical wireless ad hoc network scenarios. The results of the study demonstrate that the parallel simulation with the real time lookahead greatly enhances the capability of hybrid component networks.
尽管网络仿真是用于开发,测试和评估网络协议和应用程序的一种广泛使用的技术,但是要开发整个协议栈和正在评估的应用程序的详细模型既困难又耗时。混合组件网络将协议和应用程序的仿真模型与其他协议和/或应用程序的物理实现相结合,可以减轻建模的复杂性并建立准确的模型。但是,混合组件网络要求模拟组件的执行速度要比实时执行速度快。并行仿真技术可以极大地提高混合组件网络的性能,并且比仅顺序执行可行的方法更便于评估更大的网络。在并行仿真中,要从仿真中利用的最重要的属性之一是“超前”,但先前的研究都没有从协议或应用程序的物理实现中利用超前的行为。我们已经开发了虚拟套接字接口(VSI),它利用并行离散事件网络模拟器GloMoSim [1]中的操作应用程序和模拟网络之间的交互利用实时超前功能。本文以实时超前的概念介绍了VSI的实现,并针对典型的无线ad hoc网络场景评估了VSI。研究结果表明,具有实时前瞻性的并行仿真大大增强了混合组件网络的功能。 I> P>
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