parallelism in java

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1、CONCURRENCYANDCOMPUTATION:PRACTICEANDEXPERIENCEConcurrencyComputat.:Pract.Exper.2001;13:663680(DOI:10.1002/cpe.573)Strategiesfortheefficientexploitationofloop-levelparallelisminJavaJos´eOliver1,JordiGuitart2,EduardAyguad´e2,∗,,NachoNavarro2andJordiTorres21iSOCO,IntelligentSoftwareComponents,

2、S.A.2ComputerArchitectureDepartment,TechnicalUniversityofCatalunya,Barcelona,SpainSUMMARYThispaperanalyzestheoverheadsincurredintheexploitationofloop-levelparallelismusingJavaThreadsandproposessomecodetransformationsthatminimizethem.ThetransformationsavoidtheintensiveuseofJavaThreadsandredu

3、cethenumberofclassesusedtospecifytheparallelismintheapplication(whichreducesthetimeforclassloading).TheuseofsuchtransformationsresultsinpromisingperformancegainsthatmayencouragetheuseofJavaforexploitingloop-levelparallelismintheframeworkofOpenMP.Onaverage,theexecutiontimeforoursyntheticbenc

4、hmarksisreducedby50%fromthesimplesttransformationwheneightthreadsareused.ThepaperexploressomepossibleenhancementstotheJavathreadingAPIorientedtowardsimprovingtheapplication–runtimeinteraction.Copyright2001JohnWiley&Sons,Ltd.KEYWORDS:looplevelparallelism;JavaThreads;programtransformations1.

5、INTRODUCTIONOverthelastyears,JavahasemergedasaninterestinglanguagefortheInternetcommunity.ThisfacthasitsbasisinthedesignoftheJavalanguage.Thisdesignincludes,amongothers,importantaspectssuchasportabilityandarchitectureneutralityofJavacode,oritsmultithreadingfacilities.Thelatter,isachievedthr

6、oughthebuilt-insupportforthreadsinthelanguagedefinition.TheJavalibraryprovides∗Correspondenceto:EduardAyguad´e,CentreEuropeudeParal.lelismedeBarcelona(CEPBA),Dept.dArquitecturadeComputadors,Univ.PolitecnicadeCatalunya,JordiCirona1-3,ModulD6,Barcelona08034,Spain.E-mail:eduard@ac.upc.esPrelimi

7、naryversionsofthematerialpresentedinthispaperappearedintheproceedingsoftheACM2000JavaGrandeConferenceandTheSecondWorkshoponJavaforHighPerformanceComputing(ICS2000).Contract/grantsponsor:MinistryofEducationofSpain(CICYT);contract/grantnumber:TIC98-0511Rec