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1、CSIM19UserStoryComputerCommunicationSystemsPerformanceEvaluation:ADiscreteEventSimulationwithCSIM19ByPawanK.ChoudharyandDr.KishorS.Trivedi,DepartmentofElectricalandComputerEngineering,DukeUniversityIntroductionIamaPhDstudentinElectricalandComputerEngineeringatDukeUniversity.Iwo
2、rkwithDr.KishorS.Trivedi,andourresearchinterestsfocusonreliabilityandperformanceApplicationArea:NetworkPerformanceassessmentofcomputerandcommunicationsystems.Ourteam,apartoftheCenterforAdvancedComputingandPlatform:Communication,isstudyingtheeffectofwebcachingonWindowsnetworkpla
3、nning.Westudythelatencyofabrowserretrievingfilesforgiventrafficcharacteristics,numberofCSIM19’sChallenge:users,bandwidthofaccesslinkandcachehitrate,inorderAssessingthetofindthefastestandmostcost-effectivenetworkperformanceofseveralconfiguration.networkconfigurations:TheProject2
4、56kb/nocacheThepurposeofourprojectistodeterminewhetherdoubling512kb/nocachenetworkbandwidthisabettersolutionforimproved256kb/cacheperformance,orifaddingawebcacheismoreeffective.with50%hitrateOursystemmodelconsistsofatypicalinfrastructureinterconnectingasubnetwiththeInternet,ass
5、howninFigure1.Whentheuserclicksonahyperlink,severalURLrequestsaresentfromthebrowsertothewebproxy,whichcontainsacacheofstoredfiles.Ifthewebproxycontainsacopyoftherequestedfilethatisconsistentwiththeoriginalcopyontheremoteserver,thenahitoccursandthewebpageisretrievedfromthecache;
6、otherwiseamissoccurs,andtheproxyretrievesanoriginalcopyofthefilefromtheremoteserver(aprocessthattakesmoretime).Weareinterestedintheresponsetime,orlatency,thatoccursindeliveringthefile.Wedefineresponsetimeasthetimeintervalfromtheuserclickingonthelinktotherequestedobjectbeingdisp
7、layedonthemonitor.“SinceCSIMiscompiledratherthaninterpreted,ourmodelsexecuteFigure1:InternetArchitectureunderEvaluationquickly.ThisexecutionspeedenabledustoWehaverunsimulationsforthreedifferentsystemmodelourdesiredtestarchitectures:caseof500?Bandwidth=256kb/s,withnowebcachesimu
8、ltaneoususers.”?Bandwidth=512kb/s,withnowebcache-P.K.C
