可重構Cache與處理器的自適應低能耗算法的研究.pdf

1、湖南大學碩士學位論文可重構Cache與處理器的自適應低能耗算法的研究姓名：王宇明申請學位級別：碩士專業(yè)：@指導教師：彭蔓蔓20070301可重構Cache與處理器的自適應低能耗算法的研究IIAbstractInthelastdecadelimitingcomputerenergyconsumptionhasbecomeanimptantgoalincomputerdesignlargelyduetogrowuseofptableembe

2、ddedcomputerswithlimitedbatterycapacities.Thispaperconcernshowtoreduceprocesscecache’senergyconsumptionsincetheprocesscecacheconsumemuchofacomputer’senergy.Reconfigurablecachehasasetofadjustableconfigurationtheselftuning

3、algithmfreconfigurablecachecanmonitcachebehaviperfmancedynamicallymodifyitsconfigurationsbasedontherequirementofrunningprogramminimizetheenergyconsumptionperfmanceloss.Aphasebasedselftuningalgithm(PBSTA)freconfigurableca

4、cheispresentedwhichusesstatemachinebasedoninstructionwkingsetsignaturefidentifythechangeinprogrammakingadecisiontoadjustcache’ssizeusesstatemachinefgoverningcachedetermininghowtoadjustcache’ssizeineachphase.Incontrastwit

5、hpreviouswksthealgithmseeksnotonlytoeffectivelylowerthecache’senergyconsumptionbutalsoreducetheperfmancelossduetounnecessaryreconfiguraitions.Dynamicvoltagescalingisaneffectivewaytoreduceprocessenergyconsumptionthroughch

6、angingtheprocess’ssupplyvoltageclockfrequencyatruntime.Howevertheprocessenergysavingscomesatthecostofdegradedperfmancebecauseslowingthevoltagewouldincreasethecircuitdelay.Soitneedsanalgithmtodecidewhenhowtoscalinginderto

7、savingtheprocessenergywhilemeettheperfmance’sneed.Aphasebasedvoltagescalingalgithm(PBVSA)ispresentedwhichusesstatemachinefidentifythechangeinprogrammakingadecisiontochangetheprocess’ssupplyvoltageclockfrequencysetsproces

8、s’svoltageclockfrequencybyestimatingexploitingtheratioofthetotaloffchipaccesstimetothetotalonchipcomputationtime(β)ineachphase.TheresultsshowPBVSAeffectivelysavestheprocessenergywhilemeettheperfmance’sneed.AlthoughPBSTAP

9、BVSAcouldeffectivelylowerthecacheprocess’senergyconsumptiontheircombinedeffectonpowerconsumptionmightnotbesimplyalinearcombinationofthetwooptimalsolutions.Analgithm(CVPBSTA)ispresentedthatcombinesPBSTAPBVSAwhichusesstate