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Title page for ETD etd-4798-11230Type of DocumentMaster's ThesisAuthorLiu, Binzhang M.S.Author's Email Addressbliu@vt.eduURNetd-4798-11230TitleCharacterizing Web Response TimeDegreeMaster of ScienceDepartmentComputer ScienceAdvisory Committee Advisor Name Title Edward A. FoxCommittee ChairMarc AbramsCommittee MemberRoger W. EhrichCommittee Member KeywordsWorld Wide Web Latency Proxy CachingDate of Defense1998-04-22AvailabilityunrestrictedAbstractIt is critical to understand WWW latencyin order to design better HTTP protocols. In this studywe characterize Webresponse time and examine the effects of proxy caching, network bandwidth,traffic load, persistent connections for a page, and periodicity.Based on studies with four workloads, we showthat at least a quarter of the total elapsedtime is spent on establishing TCP connections with HTTP/1.0. Thedistributions ofconnection time and elapsed time can be modeled using Pearson,Weibul, or Log-logistic distributions. We also characterize the effectof a user's network bandwidth on responsetime.Average connection time from a clientvia a 33.6 K modem is two times longer than that from a client viaswitched Ethernet. We estimate the elapsed time savings from usingpersistent connections for a page to vary from about a quarter to a half.Response timesdisplay strong daily and weekly patterns. This study finds that a proxycaching server is sensitive to traffic loads.Contrary tothe typical thought about Web proxy caching, this study also finds that asingle stand-alone squid proxy cache does not always reduce response timefor our workloads. Implications ofthese results to future versions of the HTTP protocol and to Web applicationdesign also are discussed.Files Filename Size Approximate Download Time (Hours:Minutes:Seconds) 28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access thesis.pdf438.24 Kb00:02:0100:01:0200:00:5400:00:2700:00:02 Browse All Available ETDs by ( Author | Department )
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