P2P文件共享系統(tǒng)性能研究.pdf

1、重慶郵電大學(xué)碩士學(xué)位論文P2P文件共享系統(tǒng)性能研究姓名：朱輝云申請學(xué)位級別：碩士專業(yè)：計(jì)算機(jī)應(yīng)用技術(shù)指導(dǎo)教師：唐紅20110529重慶郵電大學(xué)碩士論文AbstractAbstractAlongwiththeconstantlydevelopmentoftheInternet，notonlythesizeofthenetworkexpandsrapidlybutkindsofnetworkapplicationemergeinendles

2、slyTheapplicationofP2PoccupiesthemajorityofInternettraffic，andBitTorrent(commonlycalledBT)isstillthemostpopulartransportprotocoloftheP2PdocumentsTheoperationmechanismoftheP2Pnetworkhasanimportanteffectontheflowcharacteri

3、sticsandnetworkperformance。SesearchingontheoperationmechanismofP2PnetworkandimprovingthefiletransferefficiencyintheBTprotocoleffectivelyhaveanimportantrealisticsignificancetoimprovetheperformanceofthewebserviceandreducet

4、heloadofthenetworkForthedownloadefficiencyoftheP2Pfilesharingsystem，thefollowingresearchesBasedonthegeneralintroductionofP2Pnetworkwerecarriedout：(1)SeveralfactorsintheBitTorrentfiletransferprotocolarebeingabstracted，the

5、naconclusionabouttheminimumtimeofthefiledistributionwithankindsofbandwidthareconducted，andthecorrespondingdistributionrulesaregiven(2)ItproposesafriendlyneighborselectionalgorithmbasedonbandwidthestimationFirstlyitestima

6、testhebandwidthofpeers，then，choosestheneighboraccordingtotheprincipleofbandwidthmatchingBecausethealgorithmchoosesneighboraccordingtotheprincipleofbandwidthmatching，wecalleditfriendlyneighborselectionalgorithmBecausethed

7、ataneededisgatheredfromtheexchanginginformationamongtheneighborsdirectlyitavoidstheproblemssuchastheincreasingofnetworkflow，andthealgorithmdoesn’tneedtheinterventionofthetracker(3)Itbuildsasimulatorwhichisbasedonthedrivi

8、ngofthediscreteeventwithC，andverifiesavailabilityofthealgorithmsbythesimulationComputersimulationsshowthatthepeers’uploadbandwidthisaccuratelyestimatedbythebandwidthestimationalgorithmTheaveragedownloadtimeisstablyreduce