斯坦福大学2003年操作系统期末考试题(英文)

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1、FINALEXAM–INTRODUCTIONTOOPERATINGSYSTEMSCSE421May2,2003(Spring2003)NAME:_____________________________________________________________STUDENTNUMBER:_________-_________INSTRUCTIONSThisisaclosedbookbutyouareallowedtwosheetsofinformationtoreferto.Youhave180minutestocomplete10questions.Pleasew

2、riteneatlyandclearly.Toreceivepartialcredit,youmustshowallworkforyouranswers.Youshouldhave11pagesinthisexambook,someofwhichareblanktoallowroomforyouranswers.QuestionGrade1____/202____/203____/104____/145____/206____/167____/108____/109____/1010____/10Total____/140RawScore:___________/140=

3、____________/1001)[20Points]DeadlockConsiderthefollowingsnapshotofasystem(P=Process,R=Resource):AvailableRARBRCRD8597MaximumDemandRARBRCRDP03214P10252P25105P31530P43033CurrentAllocationRARBRCRDP01011P10121P24003P31210P41030Answerthefollowingquestionsusingbanker’salgorithm:a)CalculatetheNe

4、edsmatrix:NeedsRARBRCRDP0P1P2P3P4b)Isthesysteminasafestate?Ifso,showasafeorderinwhichtheprocessescanrun.c)CanarequestofoneinstanceofRAbyProcessP0begrantedsafelyaccordingtoBanker’salgorithm?112)[20points]LogicalandPhysicalAddressSpacesTheKiwi™memoryarchitecturedesignteamhasadilemma.Theteam

5、isconsideringseveraldifferentmemoryconfigurationvariationsforanupcomingmachinedesign.Considerthefollowingdesigns(Allmemoryaccessesareintermsofbytes,andallareusingpagingtechniques):CharacteristicDesign1Design2Design3PhysicalMemoryAddressWidth8bit16bit32bitLogicalAddressWidth12bit20bit24bit

6、Page/Framesizeinbytes16bytes32bytes64bytesPageTableTypeSingleSingleDoublea)[6points]Foreachdesign,listthemaximumnumberofpageseachprocesscanaccessinlogicaladdressspace.b)[6points]Foreachdesign,listthemaximumnumberofframesinphysicalmemory.c)[6points]Fordesign3,iftheoutermostpagetableholds32

7、entries,howmanybitsareneededinthelogicaladdresstorepresenttheouterpagetable?Howmanybitsareusedforrepresentingtheoffsetwithinapage?Howmanybitsareneededinthelogicaladdressinordertorepresenttheinnerpagetable?113)[4+4+2=10points]PageReplacementGiventhefollowingreference