一种基于动态调度算法的Web QoS控制系统的设计与实现
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摘要
随着Internet技术的快速发展以及网络技术的讯速普及,Internet上Web应用和HTTP请求的爆炸性增长,使得许多Web站点经常面临服务器超载问题。Web服务质量(Web Quality of Service,Web QoS)主要由两个因素决定,网络本身传输的服务质量和Web服务器的服务质量。然而目前,Web服务器的服务质量在很大程度上已经成为抑制Web QoS的主要瓶颈。因此,如何有效控制Web服务器的服务质量,成为迫切需要解决的问题。本文着重对Web QoS的控制技术进行了研究。
首先,本文分析了当前Web QoS技术研究方向以及国内外研究现状。针对它们存在灵活性、通用性、可扩展性等方面的问题,阐述了在服务提供者接口(Service Provider Interface,SPI)进行服务质量控制的思想,并对相关的关键技术进行了介绍。
其次,本文设计实现了一种基于动态加权调度算法的web QoS控制系统。提出了一种能对WEB QoS进行调度控制的动态加权调度算法,在此基础上,设计了一种WEB QoS控制系统,能基于SPI框架对过往的包进行截获的特性,使服务器具有过载保护,服务区分的功能。系统主要包括QoS规则库模块、过载保护模块、分类模块、动态调度模块等模块。
最后,本文基于NS2仿真平台和所设计的控制系统进行了实验与性能评估。通过对NS2进行扩展,对具有QoS功能的动态调度算法进行仿真测试,仿真结果表明算法在平均吞吐量和丢失率等方面具有较好的优势。此外,还对系统进行了过载保护和性能测试,实验表明控件对服务器的过载具有较好的保护作用,能够较好地防止服务器过载,提高服务器的性能。
With the development of the computer network and multimedia technologies, the Web application and HTTP requests on the Internet is increasing explosively, and many web sites hava to face the problem of the server overload. Web Quality of Service is generally influenced with two elements:the quantity of service of network's transfer layer and the performance of the web server. Recently, the server's processing power in some degree is becoming the bottleneck of the QoS control. Therefore, web server to achieve quality control becomes an urgent problem how to resolve. So, it reseaches the QoS control on the thesis.
First, this thesis analysis the current direction of Web QoS technology research, as well as domestic and foreign research. They exist the question of flexibility, versatility, scalability, so it introduces that it goes on the Web QoS control int the SPI, Service Provider Interface, and it introduce the key technology.
Second, it designs and implements a web QoS control system based on the dynamic scheduling algorithm. It proposes a dynamic scheduling algorithm with Web QoS control, and designs a Web QoS control system based on the characteristics that SPI intercepte packets in the past, which provides the server overload protection and the service distinction. System includes the QoS module, overload protection module, classification module, dynamic scheduling module.
Finally, it takes experiments and performance analysis based on the foundation of NS2 simulation and the designed control system. It takes the simulation test for the QoS dynamic scheduling algorithm through the expand the NS2, and it shows that it has advantages at the average throughput and loss rate. In addition, it takes the overload protection and performance test, it shows that it has good role to the overload protection for the server, avoids the server overload, and improves the performance of the server.
首先,本文分析了当前Web QoS技术研究方向以及国内外研究现状。针对它们存在灵活性、通用性、可扩展性等方面的问题,阐述了在服务提供者接口(Service Provider Interface,SPI)进行服务质量控制的思想,并对相关的关键技术进行了介绍。
其次,本文设计实现了一种基于动态加权调度算法的web QoS控制系统。提出了一种能对WEB QoS进行调度控制的动态加权调度算法,在此基础上,设计了一种WEB QoS控制系统,能基于SPI框架对过往的包进行截获的特性,使服务器具有过载保护,服务区分的功能。系统主要包括QoS规则库模块、过载保护模块、分类模块、动态调度模块等模块。
最后,本文基于NS2仿真平台和所设计的控制系统进行了实验与性能评估。通过对NS2进行扩展,对具有QoS功能的动态调度算法进行仿真测试,仿真结果表明算法在平均吞吐量和丢失率等方面具有较好的优势。此外,还对系统进行了过载保护和性能测试,实验表明控件对服务器的过载具有较好的保护作用,能够较好地防止服务器过载,提高服务器的性能。
With the development of the computer network and multimedia technologies, the Web application and HTTP requests on the Internet is increasing explosively, and many web sites hava to face the problem of the server overload. Web Quality of Service is generally influenced with two elements:the quantity of service of network's transfer layer and the performance of the web server. Recently, the server's processing power in some degree is becoming the bottleneck of the QoS control. Therefore, web server to achieve quality control becomes an urgent problem how to resolve. So, it reseaches the QoS control on the thesis.
First, this thesis analysis the current direction of Web QoS technology research, as well as domestic and foreign research. They exist the question of flexibility, versatility, scalability, so it introduces that it goes on the Web QoS control int the SPI, Service Provider Interface, and it introduce the key technology.
Second, it designs and implements a web QoS control system based on the dynamic scheduling algorithm. It proposes a dynamic scheduling algorithm with Web QoS control, and designs a Web QoS control system based on the characteristics that SPI intercepte packets in the past, which provides the server overload protection and the service distinction. System includes the QoS module, overload protection module, classification module, dynamic scheduling module.
Finally, it takes experiments and performance analysis based on the foundation of NS2 simulation and the designed control system. It takes the simulation test for the QoS dynamic scheduling algorithm through the expand the NS2, and it shows that it has advantages at the average throughput and loss rate. In addition, it takes the overload protection and performance test, it shows that it has good role to the overload protection for the server, avoids the server overload, and improves the performance of the server.
引文
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[16]唐忠文,王攀.基于内容自适应的Web QoS反馈控制系统研究.计算机应用研究,2009,26(6)：2295-2298,2213
[17]孙晓晗,曹健,赵海燕.面向QoS的服务流程优化.计算机工程与应用,2009,45(15)：87-90,117
[18]Wenping Pan, Dejun Mu, Hangxing Wu etal. Feedback control-based QoS guarantees in web application servers.Source: Proceedings-10th IEEE International Conference on High Performance Computing and Communications, HPCC 2008.2008,328-334
[19]陈红红.一种支持Web QoS的前置服务器解决方案.计算机技术与发展,2009,19(7)：227-229,233
[20]黄涛,陈宁江,魏俊等.OnceA/Q:一个面向QoS的Web应用服务器.软件学报,2004,15(12)：1787-1799
[21]林珂珉,易军凯,范国闯.Web应用服务器OnceAs的实现与测试.北京化工大学学报,2007,34(增刊)：51-54
[22]施笑安,周兴社,林奕.支持服务质量的Linux内核设计与实现.计算机科学,2005,32(8)：216-217
[23]王永新,刘日升,朱春开等.保障QoS的实时Linux系统设计.微计算机信息,2006,22(26)：54-56
[24]单志广.Web服务质量(QoS)控制的策略、模型及性能分析：[北京科技大学博士学位论文.北京：北京科技大学控制理论与控制工程,2002,16-27
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