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1、InformationKnowledgeSystemsManagement5(2005/2006)211226211IOSPressBatchscheduledadmissioncontrolforcomputerandnetworksystemsNongYe∗,ToniFarley,XuepingLiandHarishBashettihalliArizonaStateUniversityAbstract:Anincreasingnumberofbusinesstransactions,mission-criticalope
2、rationsandmanyotheractivitiesrelyontheservicesofcomputerandnetworksystems,andthedependabilityofthoseservices.However,manycomputerandnetworksystemsdonotcurrentlyprovideadequateservicedependability.Suchsystemsplacenoadmissioncontrolonservicerequests(jobs),leadingtova
3、riabilityandthusunpredictabilityinjobwaitingtimeswhichhaveanegativeimpactonservicedependability.ThispaperpresentsaBatchScheduledAdmissionControl(BSAC)methodtohelpprovidepredictabilityinjobwaitingtimeforhighpriorityjobs.Withthismethod,wechangethedynamicjobarrivingpr
4、oblemintoastaticproblemwhichallowstheintroductionofjobschedulingtechniquesthatrequireastaticsetofjobstooperateonforstabilizingtheirwaitingtime.Weillustratehowourmethodcanbeemployedthroughexamplesandexperimentsthatcomparetheperformanceofourmethodwiththatofnoadmissio
5、ncontrol.Theresultsunderourtestcasesshowthatourmethodimprovesthevarianceofjobwaitingtimes,andinsomecaseswithlittlesacrificetothemeanofjobwaitingtimes.Keywords:Admissioncontrol,qualityofservice,computernetworks1.IntroductionQualityofService(QoS)oncomputerandnetworksy
6、stemsiscrucialtobusinesstransactions,mission-criticaloperationsandmanyotheractivitiesthatrelyonsuchsystems.TimelinessisanimportantattributeofQualityofService[1,2].Timelinessmeasuresthetimeittakesacomputerornetworksystemtorespondto,process,andcompleteaservicerequest
7、(job).Ingeneral,whenajobarrivesatasystemrequestingservice,thesystemadmitsthejob.Iftherequestedsystemresourceisbusyprocessinganotherjob,thesystemplacesthearrivingjobinaqueuetoawaitservice.Thetimethatajobspendsinthesystemincludeswaitingandprocessingtimes.Processingti
8、meisthetimeittakesaresourcetoprocessajobafterremovingitfromawaitingqueue.Ajobssizeusuallydeterminesitsprocessingtime.Waitingtimedependsonjobsched
