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ID:43548755
大小:1.84 MB
页数:106页
时间:2019-10-10
《基于控制的web预取的分析与分析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、本文的主要研究目的就是为了解决互联网中浏览速度慢的问题,但是解决夭法如果不恰当,反而使问题更恶化。直接和贪心的网络预取方法会增大网络业窃的突发性,导致网络利用率下降,甚至导致网络拥塞。所以本文研究了网络预耳的控制问题。预取控制将决定网络预取能否全面推广而不对网络的性能产生严g的负面影响。考虑到Web代理服务器业务的自相似性特征,对于网络预取的控制,本M采用了基于网络性能测量的平滑退避算法。这种算法的核心就是依据网络性能白测量把预取请求在整个请求传输中分散,它可以在不改变预取请求的情况下,e变预取请求的传输模式
2、,使得预取请求的传输变得比较分散本文还总结了网络性能中关于网络带宽和网络往返时间的各种测量方法,J对其进行了比较。仿真中采用了网络中真实的Trace记录,所以仿真的结果比屯可信和具有说服力。最后,本文把预取方法和预取控制推广到了无线网络中,提出了一种适用刁无线移动网络环境的预取方法,这是一种以网页内容和客户端记录,以及服务常端对特殊结构网页的分析,用户倾向记录文件和过去群体使用者存取行为为基血的方法。关键词:预取预取控制网络性能测量网络带宽仿真用户倾向记录文件用户访问模式群集AbstractThepurpos
3、eofthisthesismainlyresearcheshowtosolvetheproblemthatthspeedofbrowsingisveryslowintheInternet.However,ifthemethodisn(appropriate,maybeitwillmakethingsworse.Themethodofstraightforwardanaggressiveprefetchingprobablyincreasestheburstinessandcausesthenetworutil
4、izationdown.Sometimesitevenleadstonetworkcongestion.ThereforethethesiresearchestheissueofprefechingcontrolPrefechingcontrolwilldeterminewhethfprefetch!ngcouldbepopularizedornot,whichitdoesn'taffecttheperformanceofthnetworknegativelyConsideringtheself-simila
5、ritycharacterwhichwebproxysevertraffichas,fcprefetechingcontrol,thethesisadoptsthenetworkmeasurement-basedSmoothinandBackoffAlgorithm.ThekernelofthisAlgorithmisthatwecoulddispersprefbtchingrequestsoverthewholerequeststransferaccordingtothemeasurementcthenet
6、workperformance.Itcouldchangethetransfermodelofprefetchingrequesratherthanchangeprefetchingrequest,thiswillmakethetransferofprefetchin7、workroundtriptimeonthnetworkperformance.Inthesimulationthe『ealTracerecordisused?sotheresultsothesimulationareconvincibleandbelievable.Finally,thethesisextendstheprefetchingmethodandprefetchingcontrolint(thewirelessnetworkandpresentsapreftechingmethodthatcou8、ldbeappliedinthiwirelessnetworkenvironment,whichisbasedoncontentsofthewebpages,usersterminalrecord’stheanalysisofthewebpageswithspecialstructureontheserversfilesthatusersarelikelytorecordandthebehavior
7、workroundtriptimeonthnetworkperformance.Inthesimulationthe『ealTracerecordisused?sotheresultsothesimulationareconvincibleandbelievable.Finally,thethesisextendstheprefetchingmethodandprefetchingcontrolint(thewirelessnetworkandpresentsapreftechingmethodthatcou
8、ldbeappliedinthiwirelessnetworkenvironment,whichisbasedoncontentsofthewebpages,usersterminalrecord’stheanalysisofthewebpageswithspecialstructureontheserversfilesthatusersarelikelytorecordandthebehavior
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