Table Of ContentSPRINGER BRIEFS IN COMPUTER SCIENCE
Arthur Francisco Lorenzon
Antonio Carlos Schneider Beck Filho
Parallel
Computing Hits
the Power Wall
Principles,
Challenges, and a
Survey of Solutions
123
SpringerBriefs in Computer Science
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Arthur Francisco Lorenzon
Antonio Carlos Schneider Beck Filho
Parallel Computing Hits
the Power Wall
Principles, Challenges, and a Survey
of Solutions
123
ArthurFranciscoLorenzon AntonioCarlosSchneiderBeckFilho
DepartmentofComputerScience InstituteofInformatics,CampusdoVale
FederalUniversityofPampa(UNIPAMPA) FederalUniversityofRioGrande
Alegrete,RioGrandedoSul,Brazil doSul(UFRGS)
PortoAlegre,RioGrandedoSul,Brazil
ISSN2191-5768 ISSN2191-5776 (electronic)
SpringerBriefsinComputerScience
ISBN978-3-030-28718-4 ISBN978-3-030-28719-1 (eBook)
https://doi.org/10.1007/978-3-030-28719-1
©TheAuthor(s),underexclusivelicensetoSpringerNatureSwitzerlandAG2019
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MárciaCristinaandAuroraCera.
Preface
Efficiently exploiting thread-level parallelism from modern multicore systems has
been challenging for software developers. While blindly increasing the number
of threads may lead to performance gains, it can also result in a disproportionate
increase in energy consumption. In the same way, optimization techniques for
reducing energy consumption, such as DVFS and power gating, can lead to
huge performance loss if used incorrectly. In this book, we present and discuss
several techniques that address these challenges. We start by providing a brief
theoreticalbackgroundonparallelcomputinginsoftwareandthesourcesofpower
consumption. Then, we show how different parallel programming interfaces and
communicationmodelsmayaffectenergyconsumptionindifferentways.Next,we
discuss tuning techniques to adapt the number of threads/operating frequency to
achievethebestcompromisebetweenperformanceandenergy.Wefinishthisbook
withadetailedanalysisofarepresentativeexampleofanadaptiveapproach.
Alegrete,Brazil ArthurFranciscoLorenzon
PortoAlegre,Brazil AntonioCarlosSchneiderBeckFilho
vii
Acknowledgments
TheauthorswouldliketothankthefriendsandcolleaguesatInformaticsInstitute
oftheFederalUniversityofRioGrandedoSulandgiveaspecialthankstoallthe
peopleintheEmbeddedSystemsLaboratory,whohavecontributedtothisresearch
since2013.
The authors would also like to thank the Brazilian research support agencies,
FAPERGS,CAPES,andCNPq.
ix
Contents
1 RuntimeAdaptability:TheKeyforImprovingParallelApplications.. 1
1.1 Introduction .............................................................. 1
1.2 ScalabilityAnalysis...................................................... 3
1.2.1 VariablesInvolved............................................... 5
1.3 ThisBook ................................................................ 7
2 FundamentalConcepts....................................................... 9
2.1 ParallelComputinginSoftware......................................... 9
2.1.1 CommunicationModels......................................... 9
2.1.2 ParallelProgrammingInterfaces................................ 10
2.1.3 MulticoreArchitectures ......................................... 12
2.2 PowerandEnergyConsumption........................................ 13
2.2.1 DynamicVoltageandFrequencyScaling....................... 14
2.2.2 PowerGating..................................................... 15
3 TheImpactofParallelProgrammingInterfacesonEnergy............. 17
3.1 Methodology ............................................................. 17
3.1.1 Benchmarks...................................................... 17
3.1.2 MulticoreArchitectures ......................................... 19
3.1.3 ExecutionEnvironment.......................................... 20
3.1.4 Setup ............................................................. 22
3.2 Results.................................................................... 23
3.2.1 PerformanceandEnergyConsumption......................... 23
3.2.2 Energy-DelayProduct........................................... 30
3.2.3 TheInfluenceoftheStaticPowerConsumption............... 34
3.3 Discussion................................................................ 38
4 TuningParallelApplications................................................. 41
4.1 DesignSpaceExplorationofOptimizationTechniques................ 41
4.2 DynamicConcurrencyThrottling....................................... 42
4.2.1 ApproacheswithnoRuntimeAdaptation
andnoTransparency............................................. 43
4.2.2 ApproacheswithRuntimeAdaptationand/orTransparency .. 45
xi
xii Contents
4.3 DynamicVoltageandFrequencyScaling............................... 49
4.3.1 ApproacheswithnoRuntimeAdaptation
andnoTransparency............................................. 49
4.3.2 ApproacheswithRuntimeAdaptationand/orTransparency .. 50
4.4 DCTandDVFS .......................................................... 51
4.4.1 ApproacheswithnoRuntimeAdaptation
andnoTransparency............................................. 51
4.4.2 ApproacheswithRuntimeAdaptationand/orTransparency .. 52
5 CaseStudy:DCTwithAurora .............................................. 55
5.1 TheNeedforAdaptabilityandTransparency .......................... 55
5.2 Aurora:SeamlessOptimizationofOpenMPApplications............. 56
5.2.1 IntegrationtoOpenMP.......................................... 56
5.2.2 SearchAlgorithm................................................ 60
5.3 EvaluationofAurora..................................................... 63
5.3.1 Methodology..................................................... 63
5.3.2 Results............................................................ 66
6 Conclusions.................................................................... 79
References.......................................................................... 81
