CON4529 - JDK 9 Hidden gems - RainFocus · 2017-10-04 · JEP 243: Java-Level JVM Compiler...

Copyright©2017, Oracleand/oritsaffiliates.Allrightsreserved.

CON4529- JDK9 Hidden Gems

MikaelVidstedtDirector,JavaVirtualMachine,Oracle@MikaelVidstedt

SandhyaViswanathanSeniorStaffSoftwareEngineer,Intel

Copyright©2017, Oracleand/oritsaffiliates.Allrightsreserved. |

SafeHarborStatementThefollowingisintendedtooutlineourgeneralproductdirection.Itisintendedforinformationpurposesonly,andmaynotbeincorporatedintoanycontract.Itisnotacommitmenttodeliveranymaterial,code,orfunctionality,andshouldnotberelieduponinmakingpurchasingdecisions.Thedevelopment,release,andtimingofanyfeaturesorfunctionalitydescribedforOracle’sproductsremainsatthesolediscretionofOracle.

2


ProjectJigsaw

• JEP261:ModuleSystem• JEP200:TheModularJDK• JEP201:ModularSourceCode• JEP220:ModularRun-TimeImages• Plus– JEP260:EncapsulateMostInternalAPIs– JEP282:jlink:TheJavaLinker

ModularizetheJavaPlatform

3


JEP282:jlink:TheJavaLinker• Createatoolthatcanassembleandoptimizeasetofmodulesandtheirdependenciesintoacustomrun-timeimageasdefinedinJEP220.Defineapluginmechanismfortransformationandoptimizationduringtheassemblyprocess,andforthegenerationofalternativeimageformats• Createacustomruntimeoptimizedforasingleprogram• JEP261defineslinktime asanoptionalphasebetweenthephasesofcompiletimeandruntime.Linktimerequiresalinkingtoolthatwillassembleandoptimizeasetofmodulesandtheirtransitivedependenciestocreatearun-timeimageorexecutable

4


java.corba

java.se

java.se.ee

java.transaction

java.xml.ws

java.sql

java.sql.rowset

java.xml.bind

java.jnlp

java.activation

java.desktop

java.management.rmi

java.xml.crypto

java.transfer

java.compiler java.rmi

java.xmljava.instrument java.logging

java.management

java.namingjava.scripting

java.security.jgss

java.base

java.prefs

java.security.sasl

java.xml.ws.annotation

java.smartcardio

JavaSEModules

5


java.corba

java.se

java.se.ee

java.transaction

java.xml.ws

java.sql

java.sql.rowset

java.xml.bind

java.jnlp

java.activation

java.desktop

java.management.rmi

java.xml.crypto

java.transfer



java.management


java.security.jgss

java.base

java.prefs

java.security.sasl


java.smartcardio

JavaSEModules company.application

6


java.corba

java.se

java.se.ee

java.transaction

java.xml.ws

java.sql

java.sql.rowset

java.xml.bind

java.jnlp

java.activation

java.desktop

java.management.rmi

java.xml.crypto

java.transfer



java.management


java.security.jgss

java.base

java.prefs

java.security.sasl


java.smartcardio

JavaSEModules company.application

7


JavaCustomRuntime

8

java.sql

java.sql.rowset

java.activation

java.transferjava.xml

java.logging

java.naming

java.base

• IncludestheModularApplication

company.application

CustomImage~40Mb


• ExtendtheJARfileformattoallowmultiple,Java-release-specificversionsofclassfilestocoexistinasinglearchive

• WriteJDK-version-specificvariantsofthesamecodeintoasinglejarfile

JEP238:Multi-ReleaseJARFiles

9


JEP247:CompileforOlderPlatformVersions

• EnhancejavacsothatitcancompileJavaprogramstorunonselectedolderversionsoftheplatform• javaccompilesagainstthemost-recentversionoftheplatformAPIs.ThecompiledprogramcanthereforeaccidentallyuseAPIsonlyavailableinthecurrentversionoftheplatform

10

javac --release <release>


Agenda

• Tools&Libraries• JVM/Hotspot• Performance

MoreinformationonanyJEP:http://openjdk.java.net/jeps/{JEP#}

Searchfor:OpenJDK 9

Copyright©2017, Oracleand/oritsaffiliates.Allrightsreserved. 11


Agenda




Searchfor:OpenJDK 9

12


Agenda




Searchfor:OpenJDK 9

90+JEPsdeliveredinJDK9!

13


Tools&Libraries

14


DEMOJEP222:jshellJEP269:ConvenienceFactoryMethodsforCollectionsJEP280:IndifyStringConcatenation

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JEP222:jshell:TheJavaShell(Read-Eval-PrintLoop)• Read-eval-print-loop(REPL)forJava• Simpleandpowerfulinteractiveprogramming– Gettingstartedaswellasadvancedusecases

• Bothatool(bin/jshell)andanAPI• Features– Tabcompletion– Helptextfromjavadocs!– Savetofile

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JEP269:ConvenienceFactoryMethodsforCollections• NewlibraryAPIstomakeitconvenienttocreatecollections– Newfactorymethodsforjava.util.{Set, List, Map}– Smallnumbersofelements– Decreasetheamountofcodeneededforcreatingsmallcollectionsandmaps

• Collectionsarenon-modifiable(immutable)– EnableslibrariesandJVMtooptimizeimplementation– Note:Contentsofactualelementscanstillbemodifiediftypeexposesmutators

Set<String> alphabet = Set.of("a", "b", "c");

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JEP280:IndifyStringConcatenation• ChangethestaticString-concatenationbytecodesequencegeneratedbyjavactouseinvokedynamiccallstoJDKlibraryfunctions• EnablesfutureoptimizationsofStringconcatenationwithoutrequiringfurtherchangestothebytecodeemittedbyjavac

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public String example(String str) { return "Hello, " + str + "!"; }

public java.lang.String example(java.lang.String);Code:

0: new #2 // class java/lang/StringBuilder3: dup4: invokespecial #3 // Method java/lang/StringBuilder."<init>":()V7: ldc #4 // String Hello,9: invokevirtual #5 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;12: aload_113: invokevirtual #5 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;16: ldc #6 // String !18: invokevirtual #5 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;21: invokevirtual #7 // Method java/lang/StringBuilder.toString:()Ljava/lang/String;24: areturn

public java.lang.String example(java.lang.String);Code:

0: aload_11: invokedynamic #2, 0 // InvokeDynamic #0:makeConcatWithConstants:(Ljava/lang/String;)Ljava/lang/String;6: areturn

Invokedynamic bootstrapmethod


jshellWednesdayatJavaOne• JShell:AnInteractiveShellfortheJavaPlatform[CON3969]–Wednesday,Oct04,9:30am– 10:15am

• JShell:TheUltimateMissingTool[CON1188]–Wednesday,Oct04,10:45am– 11:30pm

• VisualJShell:JShellonSteroids[CON6166]–Wednesday,Oct04,12:45pm– 1:30pm

• ExploringJava9withREPL[CON3423]–Wednesday,Oct04,1:45pm– 2:30pm

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JVM/Hotspot

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JEP248:MakeG1theDefaultGarbageCollector• Goal:throughputand lowlatency• Regionbased– Collectsregionswithmostgarbagefirst

• Defaultpausetargetis200milliseconds– Higherpausegoal→ morethroughput,higherlatency– Lowerpausegoal→ lessthroughput,lowerlatency

• DefaultGCinJDK9(butinJDKsince6u14)– Adaptivestartofconcurrentcycle–Moreeffectivepauses

Selectregionstoevacuate

Evacuate

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MoreonG1atJavaOne• The G1 GCinJDK9[CON6061]–Wednesday,Oct04,1:45pm- 2:30pm

• G1GC ConceptsandPerformanceTuning[CON4577]–Wednesday,Oct04,12:45pm- 1:30pm

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GC:Deprecating&Removing• JEP291:DeprecatetheConcurrentMarkSweep(CMS)GarbageCollector– Toberemovedinfuturerelease

• JEP214:RemoveGCCombinationsDeprecatedinJDK8– iCMS,DefNew+CMS,CMSForeground,…

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• CDS=ClassDataSharing– ApplicationCDSaddssupportforapplication(non-JDK)classes

• Preloadasetofclasses• Storeclassdatainsharedarchive– Think:OSsharedlibrary(lib*.so)

• ShareacrossJavainstances• NewinJDK9– Supportsinternedstringsinarchive

JEP250:StoreInternedStringsinCDSArchives

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Example:WebLogicServerBaseDomainApplicationClassDataSharing(AppCDS)Benefits

25

•Sharing & savings increases with every instance•10 instances ---> 10+% saving in total memory footprint

Footprint

Size

(MB)

- N

ote:

Log

arith

mic

!1

10

100

1000

10000

Unique Shared Total

4,137

66

4,073 4,652

20

4,634 No AppCDSAppCDS

Startup Time

Tim

e (s

)

0

1

2

3

4

5

6

7

8

9

10

11

12

No AppCDS AppCDS

7.7

11.4


Example:WebLogicServerBaseDomainApplicationCDSBenefits

26

•Sharing & savings increases with every instance•With 10 instances there is ~10% saving in total memory footprint

Footprint

Size

(MB)

- N

ote:

Log

arith

mic

!1

10

100

1000

10000

Unique Shared Total

4,137

66

4,073 4,652

20

4,634 No AppCDSAppCDS

Startup Time

Tim

e (s

)

0

1

2

3

4

5

6

7

8

9

10

11

12

No AppCDS AppCDS

7.7

11.4

Beingopensourced!


JEP295:Ahead-of-Time(AOT)CompilationJEP243:Java-LevelJVMCompilerInterface• DoeswithJITcompiledJavacodewhatAppCDS doeswithJavaclassdata– Pre-compiletosharedlibrary: jaotc --output libHelloWorld.so HelloWorld.class

– Useinsubsequentruns:java -XX:AOTLibrary=libHelloWorld.so HelloWorld

• ExperimentalfunctionalityintroducedinJDK9– Onlyonlinux-x64,otherplatformstofollow

• Benefits– Startupperformance– Reducestimetopeakperformance– Savesonfootprintbysharingacrossinstances

• Not-so-secretplan:useforenablingJava-basedJITcompiler– OpenJDKProject“Metropolis”aimstomoveJVMfunctionalitytoJava

27


java.basestaticAOTforC1java.basetieredAOTforC1+C2java.base+graalstaticAOTforC1+Graaljava.base+graaltieredAOTforC1+Graal(2)java.baseCDSjava.base+graalCDSforC1+Graal(2)

AOTBenefits:‘real’time(ms)torun`javaHelloWorld`

28

Lowerisbetter/faster


AOTatJavaOne

• HotSpot AOT Internalsand AOT +CDSPerformanceResults[CON7772]– Thursday,Oct05,10:45am- 11:30am

• FullSpeedAhead!(Ahead-of-TimeCompilationforJavaSE)[CON3738]– Wednesday,Oct04,2:45pm- 3:30pm

29


JavaFlightRecorder(JFR)

• ModularizedandExtensibleAPIs– Fullysupported– Allowsuser-defined/customevents

• Producesdataevenin”bad”situations(e.g.out-of-memory)• Lotsofnewevents:module,safepoint,codecache,compilerinlining• Reducedfootprint(memory&disk)throughcompresseddatatypes

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import jdk.jfr.* java -XX:+FlightRecorder

VisualizationusingJavaMissionControl(JMC)


JavaFlightRecorder(JFR)

• ModularizedandExtensibleAPIs– Fullysupported– Allowsuser-defined/customevents

• Producesdataevenin”bad”situations(e.g.out-of-memory)• Lotsofnewevents:module,safepoint,codecache,compilerinlining• Reducedfootprint(memory&disk)throughcompresseddatatypes

31

import jdk.jfr.* java -XX:+FlightRecorder

VisualizationusingJavaMissionControl(JMC)

Beingopensourced!


JavaFlightRecorder&JavaMissionControlatJavaOne

• JavaFlightRecorderinJDK9/Java Mission Control 6[HOL3018]– Wednesday,Oct04,1:30pm- 3:30pm

• DeepDiagnostics:APMandOracleJava Flight RecorderinOracleCloud[CON6916]– Wednesday,Oct04,2:45pm- 3:30pm

32


• JEP197:Segmentedcodecache– Dividedcodecacheintosegmentsreducingfragmentation

– Improve sweepandsafepointpausetimes– Benchmarksshowupto12%performanceimprovements

• JEP143:ImproveContendedLocking– SeriesoftransparentimprovementstocontendedJavalocks(think:synchronized)

– Optimizeslockacquisition,release,notify/notifyAll,…

33

OtherVM


OtherVM• JEP245:Validatecommandlineflags– Checktype&rangeofarguments– Provideusefulhints/errormessages

• JEP158/271:UnifiedLogging– CommonloggingframeworkforallcomponentsoftheHotspotJVM– Taggedmessageallowsforflexibleandfinegrainedcontrol

$ java -Xlog:gc=debug,class+load=info HelloWorld[0.012s][info][class,load] opened: lib/modules[0.018s][debug][gc ] ConcGCThreads: 1[0.018s][debug][gc ] ParallelGCThreads: 4[0.018s][debug][gc ] Initialize mark stack with 4096 chunks, maximum 16384[0.021s][info ][gc ] Using G1[0.025s][info ][class,load] java.lang.Object source: jrt:/java.base[0.025s][info ][class,load] java.io.Serializable source: jrt:/java.base[0.025s][info ][class,load] java.lang.Comparable source: jrt:/java.base<snip>

Usage: -Xlog[:[what][:[output][:[decorators][:output-options]]]]

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• StoreInternedStringsinCDSArchives• ImproveContendedLocking• CompactStrings• ImproveSecureApplicationPerformance• LeverageCPUInstructionsforGHASHandRSA• TieredAttributionforjavac• JavadocSearch• MarlinGraphicsRenderer• HiDPIGraphicsonWindowsandLinux• EnableGTK3onLinux• UpdateJavaFX/MediatoNewerVersionof

GStreamer

• EnhancedDeprecation• Stack-WalkingAPI• ConvenienceFactoryMethodsforCollections• PlatformLoggingAPIandService• jshell:TheJavaShell(Read-Eval-PrintLoop)• CompileforOlderPlatformVersions• Multi-ReleaseJARFiles• Platform-SpecificDesktopFeatures• TIFFImageI/O\• Multi-ResolutionImages

• ProcessAPIUpdates• VariableHandles• Spin-WaitHints• DynamicLinkingofLanguage-

DefinedObjectModels• EnhancedMethodHandles• MoreConcurrencyUpdates• CompilerControl

• Jigsaw– ModularizeJDK

Behindthescenes

Newfunctionality

Specialized

• ParserAPIforNashorn• PrepareJavaFXUIControls&CSSAPIsfor

Modularization• ModularJavaApplicationPackaging• NewVersion-StringScheme• ReservedStackAreasforCriticalSections• SegmentedCodeCache• Ahead-of-TimeCompilation• IndifyStringConcatenation• UnifiedJVMLogging• UnifiedGCLogging• MakeG1theDefaultGarbageCollector• UseCLDRLocaleDatabyDefault• ValidateJVMCommand-LineFlagArguments• Java-LevelJVMCompilerInterface• DisableSHA-1Certificates• SimplifiedDocletAPI• DeprecatetheAppletAPI• ProcessImportStatementsCorrectly• AnnotationsPipeline2.0• ElideDeprecationWarningsonImport

Statements• MillingProjectCoin• FilterIncomingSerializationData• RemoveGCCombinationsDeprecatedin

JDK8• RemoveLaunch-TimeJREVersionSelection• RemovetheJVMTIhprofAgent• RemovethejhatTool

Housekeeping

Gone

• HTTP2Client• Unicode8.0• UTF-8PropertyFiles• ImplementSelectedECMAScript6

FeaturesinNashorn• DatagramTransportLayerSecurity

(DTLS)• OCSPStaplingforTLS• TLSApplication-LayerProtocol

NegotiationExtension• SHA-3HashAlgorithms• DRBG-BasedSecureRandom

Implementations• CreatePKCS12KeystoresbyDefault• MergeSelectedXerces2.11.0Updates

intoJAXP• XMLCatalogs• HarfBuzzFont-LayoutEngine• HTML5Javadoc

Newstandards

35


Performance

36


PerformanceGemsinJDK9• VectorizationEnhancements• CompactStrings• MathLibraries• CryptoAcceleration• CompressionAcceleration• NewAPIs

37


PerformanceSetup• Platform:• Intel®Xeon®[email protected],384GBRAM

• Software:• OS:RedHatEnterpriseLinuxServerrelease7.2• JDK8:Java(TM)SERuntimeEnvironment(build1.8.0_144-b01)• JDK9:Java(TM)SERuntimeEnvironment(build9+181)

38


VectorizationEnhancements• Vectorizationextendedto512bitstobenefitfromAVX-512• Vectorizationsuperunroll• Reductionsupportinvectorloops• Supportforadditionalvectoroperations

39


AVX512and512-bitVectorization• AVX512supportedinIntelSkylakeserverandIntelXeonPhiprocessor• 512-bitwideinteger/floatingpointSIMD• 512-bit32ZMMregister• 16singleprecisionor8doubleprecisionFPoperations• 16int/32short/64byteintegeroperations

• JVM/JITSIMDvectorizationandcodegenerationextendedto512bits• JVM/JITarray/stringintrinsicmethodsoptimizedtobenefitfromAVX512

40

Copyright©2017, Oracleand/oritsaffiliates.Allrightsreserved. | 41

Example//DatastaticfinalintNUM=1026;staticint[]data1=newint[NUM],

data2=newint[NUM],data3=newint[NUM];

//LoopKernelpublicstaticvoidIntAdd(longX){

while(X>0){for(inti=0;i<NUM;i++){data1[i]=data2[i]+data3[i];

}X--;

}}

JVMOptionsScalar:-XX:-UseSuperWord

32ByteVector:-XX:UseAVX=2-XX:MaxVectorSize=32

64ByteVector:-XX:UseAVX=3-XX:MaxVectorSize=64

64ByteVectorAligned:-XX:UseAVX=3-XX:MaxVectorSize=64-XX:ObjectAlignmentInBytes=64

VectorizationExample


JavaFloatingPointVectorizationPerformance

42

0%

20%

40%

60%

80%

100%

120%

140%

160%

180%

FloatAdd FloatMul FloadSub DoubleAdd DoubleMul DoubleSub

FPARITHMETIC

32ByteVector 64ByteVector 64ByteVectorAligned


JavaIntegerVectorizationPerformance

43

0%

20%

40%

60%

80%

100%

120%

140%

160%

180%

200%

IntAdd IntAnd IntSub IntXor LongAdd LongAnd LongSub LognXor

INTEGEROPERATIONS

32ByteVector 64ByteVector 64ByteVectorAligned


JavaStreamsPerformanceprivate static void StreamTest(int[] out, int[] in1, int[] in2, int length) {

IntStream.range(0, length).forEach (i -> { out[i] = (in1[i] - in2[i]) * (in1[i] - in2[i]); });}

44

0%

20%

40%

60%

80%

100%

120%

140%

160%

180%

StreamTest

32ByteVector

64ByteVector

64ByteVectorAligned


VectorizationSuperUnroll

ScalarPreLoop

VectorMainLoop

ScalarPostLoop

ScalarPreLoop

UnrolledVector

MainLoop

VectorPostLoop

ScalarPostLoop

JDK8 JDK9


Example:privatestaticintdot(int[]in1,int[]in2,intlength){intsum=0;for(inti=0;i<length;i++){sum+=in1[i]*in2[i];

}returnsum;

}

46

GeneratedCode:post_loop:vmovdqu320x10(%r8,%r13,4),%zmm0{%k1}{z}vpmulld0x10(%rbx,%r13,4),%zmm0,%zmm0{%k1}{z}vextracti64x4$0x1,%zmm0,%ymm1{%k1}{z}vpaddd%ymm0,%ymm1,%ymm1vextracti32x4$0x1,%zmm1,%xmm2{%k1}{z}vpaddd%xmm1,%xmm2,%xmm2vpshufd$0xe,%xmm2,%xmm3vpaddd%xmm3,%xmm2,%xmm2vpshufd$0x1,%xmm2,%xmm3vpaddd%xmm3,%xmm2,%xmm2vmovd%edx,%xmm3vpaddd%xmm3,%xmm2,%xmm3vmovd%xmm3,%edxadd$0x10,%r13dcmp%r10d,%r13djlpost_loop

ReductionSupportinVectorization

0%

50%

100%

150%

200%

250%

StreamTest

REDUCTIONPERFORMANCE

Scalar

32ByteVector

64ByteVector

64ByteVectorAligned


Example:privatestaticvoidsqrt_kernel(double[]in1,intlength,double[]out){for(inti=0;i<length;i++){out[i]=Math.sqrt(in1[i]);

}}

47

GeneratedCode:post_loop:

vsqrtpd0x10(%r11,%rbx,8),%zmm0{%k1}{z}

vmovdqu64%zmm0,0x10(%r13,%rbx,8){%k1}

add$0x8,%ebx

cmp%r8d,%ebx

jlpost_loop

AdditionalVectorOperations

0%

100%

200%

300%

400%

500%

600%

SQRT

SQRTPERFORMANCE

JDK8

JDK9


CompactString

• JavasupportsUnicode(UTF-16)characterswhichuses2bytepercharacter

• CompactStringimprovesspaceefficiencyoftheStringandrelatedclasses• ChangestheinternalrepresentationofStringclasswhilepreservingcompatibility

• CharactersofStringencodedaseitherUTF-16orISO-8859-1/Latin-1

• Usesbytearrayinsteadofchararraytostorecharacterswithanencodingbytefield

• StringmethodsarehighlyoptimizedusingSIMDinstructionswherepossible• WithCompactStringabilitytodotwicetheoperationperiteration

48

JDK8StringClass{privatefinalcharvalue[];privateinthash;...

}

JDK9StringClass{privatefinalbyte[]value;privatefinalbytecoder;privateinthash;...

}


CompactStringPerformance

49

#instances #bytes

class JDK8 JDK9 JDK8 JDK9

[C(chararray) 1023926 1423 74387360 397656

[B(bytearray) 633 1030896 378376 49531032... ... ... ... ...

Total 2650985 2695483 123502352 100114688

Total#instancessimilarbetweenJDK8andJDK9

Total#bytesallocatedis~20%lesswithJDK9

SPECjbb2005*HeapDump

Peakthroughput~5%betterwithJDK9overJDK8

ComparingJDK1.8.0_144versusJDK-9releaserunningonIntel®Core™[email protected],32GBRAMwithLinux64-bit.JAVAOPTIONS="-server-showversion–Xmx20g–Xms20g-Xmn18g-XX:-UseAdaptiveSizePolicy-XX:+UseParallelOldGC-XX:ParallelGCThreads=4-XX:+UseLargePages-XX:+PrintFlagsFinal"

*SPECjbb2005istrademarkoftheStandardPerformanceEvaluationCorporation.Seehttp://www.spec.orgformoreinformation.


OptimizedMathLibraries• OptimizedTrigonometric&TranscendentalLIBMmethods• UsedinBigDatamachinelearning,FinancialoptionpricingandHPC

applications

50

0%

100%

200%

300%

400%

500%

600%

exp pow log log10 sin cos tan

MATHPERFORMANCE

JDK8

JDK9

0%

100%

200%

300%

400%

500%

600%

MonteCarlo BoxMuller BlackScholes

FSIPERFORMANCE

JDK8

JDK9


CryptoAcceleration• Javacryptographyarchitecture(JCA)definesaproviderframework

• SunJCEisthedefaultproviderintheOpenJDKandOracleJava

• IntelarchitecturesupportsAES-NI,CLMUL,ADCX/ADOXtoaccelerateCrypto

• OptimizedstubsforSunJCEprovider

51

0%

200%

400%

600%

800%

1000%

1200%

SHA256 SHA512 AESCTR AESGCMENC AESGCMDEC CryptoRSA

CRYPTOPERFORMANCE

JDK8

JDK9


CompressionAcceleration

• JDK8usesbundledzlibwhichcannotbeoverridden• JDK9supportspluggablezlib,applicationcanbenefitfromcompressionaccelerationseamlessly• SoftwareAcceleration:• http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/zlib-compression-whitepaper-copy.pdf• HardwareAcceleration:• https://01.org/intel-quickassist-technology

52

java.util.zip

JREzlibwrapper

zlib

libzip.so

java.util.zip

JREzlibwrapper

SoftwareAcceleration

strippedlibzip.so

HardwareAcceleration

JDK8 JDK9

Systemzlib


0%

50%

100%

150%

200%

250%

300%

350%

bib book1 book2 geo news obj1 obj2 paper1 paper2 paper3 paper4 paper5 paper6 pic progc progl progp trans

COMPRESSIONPERFORMANCE

JDK9

JDK9withSWAcc

CompressionwithSoftwareAcceleration

• Softwareaccelerationusingzlibfromhttps://github.com/jtkukunas/zlib• PerformanceshownforCalgaryCorpus*• SetLD_LIBRARY_PATH=Path_to_sw_accelerated_zlib

53


NewChecksumAPI• java.util.zipCRC32perRFC1952withpolynomial0x04C11DB7

• InJDK9anewAPIjava.util.zipCRC32CperRFC3720withpolynomial0x1EDC6F41

• JDK9alsohasanoptimizedimplementationusingIAcrc32cinstructionhttps://docs.oracle.com/javase/9/docs/api/java/util/zip/CRC32C.html

54

0%

20%

40%

60%

80%

100%

120%

140%

160%

2048 4096 8192 16384

CRC32CPERFORMANCE

JDK9CRC32

JDK9CRC32C


NewArrayProcessingAPI• LexicographicarraycompareAPIintroducedinJDK9forArraysclass• Arrays.comparemethodsforboolean,byte,char,short,int,long,floatanddoubletypes,e.g.

• publicstatic int compare(byte[] a,byte[] b)• publicstatic int compare(byte[] a,int aFromIndex,int aToIndex,byte[] b,int bFromIndex,int bToIndex)

• CorrespondingcompareUnsignedmethodsforbyte,char,short,int,longarrayshttps://docs.oracle.com/javase/9/docs/api/java/util/Arrays.html

• TargetedforBigDataapplicationslikeCassandrathatusearraysforkey• UnderlyingbasemethodoptimizedusingIASIMDinstructions

55


NewFMAAPI• Javasemanticsdoesn’tallowuseofFMAinstructionsforfloat/double

multiplyaddoperationcombination• AnAPIfmaisaddedtoJDK9aspartofjava.lang.MathandStrictMath• publicstatic double fma(double a,double b,double c)• publicstatic float fma(float a,float b,float c)https://docs.oracle.com/javase/9/docs/api/java/lang/Math.html#fma-double-double-double-

• TheintrinsicforIAusesthefmainstructionforunderlyingimplementation• BeneficialforHPCandMachineLearning

56


Legal Disclaimer & Optimization Notice• INFORMATIONINTHISDOCUMENTISPROVIDED“ASIS”.NOLICENSE,EXPRESSORIMPLIED,BYESTOPPELOROTHERWISE,TOANY

INTELLECTUALPROPERTYRIGHTSISGRANTEDBYTHISDOCUMENT.INTELASSUMESNOLIABILITYWHATSOEVERANDINTELDISCLAIMSANYEXPRESSORIMPLIEDWARRANTY,RELATINGTOTHISINFORMATIONINCLUDINGLIABILITYORWARRANTIESRELATINGTOFITNESSFORAPARTICULARPURPOSE,MERCHANTABILITY,ORINFRINGEMENTOFANYPATENT,COPYRIGHTOROTHERINTELLECTUALPROPERTYRIGHT.

• SoftwareandworkloadsusedinperformancetestsmayhavebeenoptimizedforperformanceonlyonIntelmicroprocessors.Performancetests,suchasSYSmarkandMobileMark,aremeasuredusingspecificcomputersystems,components,software,operationsandfunctions.Anychangetoanyofthosefactorsmaycausetheresultstovary.Youshouldconsultotherinformationandperformanceteststoassistyouinfullyevaluatingyourcontemplatedpurchases,includingtheperformanceofthatproductwhencombinedwithotherproducts.

• Copyright©2016,IntelCorporation.Allrightsreserved.Intel,Pentium,Xeon,XeonPhi,Core,VTune,Cilk,andtheIntellogoaretrademarksofIntelCorporationintheU.S.andothercountries.

OptimizationNotice

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G1/JFR/jshellatJavaOne• The G1 GCinJDK9[CON6061]– Wednesday,Oct04,1:45pm- 2:30pm

• G1GC ConceptsandPerformanceTuning[CON4577]– Wednesday,Oct04,12:45pm- 1:30pm

• JavaFlightRecorderinJDK9/Java Mission Control 6[HOL3018]– Wednesday,Oct04,1:30pm- 3:30pm

• DeepDiagnostics:APMandOracleJava Flight RecorderinOracleCloud[CON6916]– Wednesday,Oct04,2:45pm- 3:30pm

• HotSpot AOT Internalsand AOT +CDSPerformanceResults[CON7772]– Thursday,Oct05,10:45am- 11:30am

• FullSpeedAhead!(Ahead-of-TimeCompilationforJavaSE)[CON3738]– Wednesday,Oct04,2:45pm- 3:30pm

• JShell:AnInteractiveShellfortheJavaPlatform[CON3969]– Wednesday,Oct04,9:30am– 10:15am

• JShell:TheUltimateMissingTool[CON1188]– Wednesday,Oct04,10:45am– 11:30pm

• VisualJShell:JShellonSteroids[CON6166]– Wednesday,Oct04,12:45pm– 1:30pm

• ExploringJava9withREPL[CON3423]– Wednesday,Oct04,1:45pm– 2:30pm

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CON4529 - JDK 9 Hidden gems - RainFocus · 2017-10-04 · JEP 243: Java-Level JVM Compiler...

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Transcript of CON4529 - JDK 9 Hidden gems - RainFocus · 2017-10-04 · JEP 243: Java-Level JVM Compiler...