Dynamic Object Sampling for Pretenuring - IBM Research动态对象采样pretenuring - IBM的研究.pptVIP

Dynamic Object Sampling for Pretenuring - IBM Research动态对象采样pretenuring - IBM的研究.ppt

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DynamicObjectSampling

forPretenuringMariaJumpDepartmentofComputerSciencesTheUniversityofTexasatAustinmjump@cs.utexas.eduStephenM.BlackburnDepartmentofComputerScienceAustraliaNationalUniversitySteve.Blackburn@anu.edu.auKathrynS.McKinleyDepartmentofComputerSciencesTheUniversityofTexasatAustinmckinley@cs.utexas.eduISMM,Oct.25,20041Jump,Blackburn,McKinley

CurrentTrendsObject-orientedlanguagesLotsofsmallobjectsRuntimesystemtreatsthemuniformlyObjectshavedistinctivepropertiesLifetime,accessfrequency,locality,callingcontext,threadusage,etc.PROBLEM:Howcanwediscoverandexploitobjectproperties?ISMM,Oct.25,20042Jump,Blackburn,McKinley

GatheringObjectStatisticsOfflinestatisticsInconsistentwithJavaObscurephasebehaviorOnlinestatisticsProfilingallobjectsDynamicObjectSamplingStatisticsonlyforselectedobjectsUsetoestimatebehaviorofallobjectsISMM,Oct.25,20043Jump,Blackburn,McKinley

Example:UsingObjectLifetimesforPretenuringPROBLEM:Long-livedobjectsareallocatedintothenurserySOLUTION:Allocatelong-livedobjectsdirectlyintomaturespaceCHALLENGE:CorrelatinglifetimebehaviorwithallocationsiteISMM,Oct.25,20044Jump,Blackburn,McKinley

OutlineMotivationDynamicObjectSamplingMechanismDynamicLifetimePredictionAccuracyvs.CostDynamicPretenuringAllocationSurvivalPhasesCoverage,Accuracy,andPerformanceConclusionsISMM,Oct.25,20045Jump,Blackburn,McKinley

384256128DynamicObjectSamplingModifyabump-pointerallocatorSampleoneobjecteverynbytesMemorychunk:BumpPointerSampleTag(forn=128)ISMM,Oct.25,20046Jump,Blackburn,McKinley

VM_Addressalloc(intbytes) throwsVM_PragmaInline{ VM_AddresssoldCursor=cursor; VM_AddressnewCursor=oldCursor.add(bytes); if(newCursor.GT(sampleLimit)) returnsample(bytes); cursor=newCursor; returnoldCursor;}SamplePath(Intermediate):1)addssampletag2)collectsstatisticsSlowPathBump-PointerAllocatorVM_Addressalloc(in

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