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摘要: 本文首先介绍了网络仿真技术的概念、特点和发展现状,在此基础上介绍了当前主流的通用型网络仿真软件的主要特点并对它们进行了对比分析和评价.为了解决现有网络架构灵活性和服务能力差的问题,我们引入了面向大数据建模、能够对网络整体状态进行预测和实时优化的平行网络架构及其计算实验平台.该平台融合虚拟的人工网络和实际网络的数据并对其进行实验分析和评估,可以发现最优的控制方案.基于平行网络计算实验方法,本文设计了针对微信朋友圈转发预测的网络优化方法,并通过实验验证了该方法可以有效提升网络的性能.Abstract: In this paper, the current network experiment platforms are investigated, introduced and compared. The most popularly used simulator and its main advantages and disadvantages are demonstrated. To solve the problem of lacking flexibility and service capability of traditional network experiment platforms, based on the parallel network architecture, the corresponding computational experiment platform is proposed. The proposed platform is data-oriented, and by using the computational experiments and analysis, an optimized control strategy can be continuously updated and tracked, thus the self optimization of network systems is achieved. In the end, a computational experiment based on retweet analysis of Wechat Moments is proposed, and the effectiveness of this method is evaluated.1) 本文责任编委 王卓
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表 1 常用仿真软件分类
Table 1 Common simulators classification
通用型 无线传感网 P2P网络 车载自组网 NS-2 SensorSim QueryCycle GrooveNet NS-3 Castalia Narses TraNS GlomoSim VisualSense 3LS NCTUns OMNeT++ Viptos NeuroGrid MOVE OPNET Sidh Peersim VANET MobiSim JiST/SWANS Prowler P2PSim Veins GTNetS Nsrlsensorsim SimP2 – SSFNet – – – 表 2 NS-2和NS-3的比较
Table 2 Comparison of NS-2 and NS-3
NS-2 NS-3 开源 开源 用户自定义模型困难 用户自定义模型容易 大量的用户贡献工具 少量的用户贡献工具 双语言编写(C++, Otcl) 单语言编写(C++) 编程能力要求高 编程能力要求适中 现有模型支持大量的协议 现有模型支持少量的协议 表 3 JiST/SWANS与GlomoSim和NS-2的性能对比
Table 3 Comparison of JiST/SWANS, GlomoSim and NS-2
节点数 仿真器 耗时 内存消耗 500 SWANS 43 s 1 101 KB GlomoSim 82 s 5 759 KB NS-2 7136 s 5 8761 KB 5 000 SWANS 430 s 5 284 KB GlomoSim 6191 s 27 570 KB 50 000 SWANS 4 377 s 49 262 KB 1 000 000 SWANS – 933 MB 表 4 仿真软件性能对比
Table 4 Performance comparison of simulators
软件名称 编程语言 平台 开源 内存消耗 速度 灵活性 可扩展性 易用性 NS-2 C++, Otcl 跨平台 开源 * * * ** * NS-3 C++ 跨平台 开源 *** *** ** *** *** GlomoSim Parsec Linux 开源 ** ** * *** ** QualNet Parsec 跨平台 不开源 ** ** * * *** OMNeT++ C++ 跨平台 开源 * ** ** *** ** OPNET C++ 跨平台 不开源 ** * ** * *** J-SIM Java 跨平台 开源 ** ** *** *** ** JiST/SWANS Java 跨平台 开源 *** *** *** ** ** GTNetS C++ Linux 开源 – – ** ** * SSFNet Java 跨平台 开源 – – * ** ** Mininet Python Linux 开源 ** ** *** *** ** EstiNet – Linux 不开源 *** *** ** * ** 表 5 转发预测召回率
Table 5 Recall rate of retweet prediction
线性分类器 决策树 SVM 随机森林 历史转发频度 5.6 71.09 89.9 71.09 浏览时间+历史转发频度 5.6 71.23 92.07 0 浏览页数/总页数+历史转发频度 5.7 71.09 3.03 0 浏览时间+浏览页数/总页数+历史转发频度 5.91 71.09 2.38 57.1 -
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