AbriefhistoryofvirtualizationandvirtualizationapplicationsJingdongResearchpapersDownloadNews:Virtualizationreferstothesamephysicalservertosimulatemultiplevirtualmachinescapabilities.,AndeachvirtualmachineislogicallyindependentoftheCPU,memory,disk,andnetworkinterfaces.Virtualizationcanimprovehardwareresourceutilization,allowingmultipleapplicationstorunisolatedonthesamephysicalmachine.virtualizationintothehardwarelevelvirtualizationandsoftwarelevelvirtualization.Hardwarevirtualizationisdonebyanaloghardwarewaytogetrealcomputerenvironment,youcanrunafulloperatingsysteminhardwarevirtualization,anotherFullVirtualization(fullvirtualization,acompletesetoftrueanaloghardwaredevices),PartialVirtualization(partofvirtualization,onlycriticalcomputingcomponentsorinstructionsetsimulation.operatingsystemneedstobemodifiedtoruninsomevirtualizedenvironment)andParavirtualization(paravirtualization,nohardwaretosimulateavirtualmachinehasindependentoperating1environment,thehypervisorthroughsharedhardwareresources.mostoperatingsystemsneedtobemodifiedtoruninthesemi-virtualizedenvironment),suchasdifferentimplementationsofsoftware-levelvirtualization,refertothesamephysicalservertoprovidemultipleisolatedvirtualoperatingenvironment,alsoknownasthecontainertechnology.Atthelevelofhardwarevirtualization,virtualizationtechnologyisusuallymodernfullvirtualizationandparavirtualizationmixture.CommonvirtualizationtechnologiessuchasVMWare,XenandKVMsupportbothfullvirtualizationandparavirtualization.Waytoprovidehardwarevirtualizationvirtualmachinesarerunningindependentlyofacompleteoperatingsystem,sothesamephysicalhostthereisalotonthesameorsimilarprocessesandmemorypages,resultinginalargeperformanceloss(forexample:thehostoperatingsystemisCentos,KVMgeneratedusingmultiplevirtualmachines,andineachvirtualmachineisrunningWindowsoperatingsystemandthesameQQprogram,sothattheperformanceofthehostinevitablyhaveagreaterloss).present,throughtheKSM(kernelsamepage2merging)andothertechnicalcanidentifyandmergethecontentsofmemorypagescontainingthesame,buthavenoeffectonalargenumberofidenticalorsimilarprocessestooptimizetheeffectivemeans,Ibelievethatwiththedevelopmentofvirtualizationtechnology,thetechnologyalsomadegreatprogress,sohardwarevirtualizationalsoknownastheheavyweightofvirtualization,onthesamehostcanrunsimultaneouslyonanumberofvirtualmachinesisverylimitedinthesoftwarevirtualizationlevel,allonthesamehostvirtualmachines(alsoknownasContainer)sharedhostoperatingsysteminstance,doesnotexistduetorunmultipleoperatingsysteminstancesresultingperformanceloss(forexample:thehost’soperatingsystemisCentos,throughsoftwarevirtualizationtechnologytogeneratemultipleContainer,andeachContainerisrunningQQprocess,sincetheyCentossharethesamehostoperatingsystem,allContainerprocessesintheQQproceduresCentosonlyone),sosoftwarevirtualizationisalsoknownaslightweightvirtualization,onthesamehostcanrunsimultaneouslyonavirtualoperatingenvironmentnumberofmoreliberal.toSolaris3operatingsystemContainer,forexample,aninstanceoftheSolarisoperatingsystemcantheoreticallysupportupto8000Container(actualnumberdependsontheabilitytoruntheContainersystemresourcesandload).Similarly,LinuxoperatingLXConthesystemcanalsoeasilyonthesamehostatthesametimesupportasignificantnumberofvirtualoperatingenvironment.Inthefieldofvirtualization,majordomesticandforeigncompaniesinterestedint...