HomejvmserializersGitHubWord文档下载推荐.docx

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Hardware:

IntelCore2Quad

Software:

SunJRE1.6.0_20（64-bitserverVM）,Ubuntu9.10

JVMoptions:

-Xmx16m-server

Datavaluebeingtested:

TestValue.

Versionofthebenchmarkingcode:

Gittree

Methodology:

Beforetakingmeasurements,wewarmthingsupbyrunningthetestseveraltimes.

Foratest,measurethetimetakentoperform2000operations

（serialization,deserialization,etc.）.Thendividetheresultby2000.

Runeachtest100timesandreportthebestresult.

Lookatthecodeformoredetails.BenchmarkRunner.java

ToolVersions（lib/）:

protobuf2.3.0

thrift0.2.0

avro1.3.2

kryo1.0

hessian4.0.3

1.1-SNAPSHOT

scala2.8.0-rc1

sbinary0.3.1-SNAPSHOT

google-gson1.4

jackson1.5.1

javolution5.2.6

protostuff1.0.0.M3

woodstox4.0.7

aalto0.9.5

fast-infoset1.2.6

xstream1.3.1

Charts

TotalTime（“total”）

Createanobject,serializeittoabytearray,thendeserializeitbacktoanobject.

SerializationTime（“ser”）

Createanobject,serializeittoabytearray.

Java’sbuilt-inserializerfaithfullyrepresentsarbitraryobject

graphs,whichhurtsperformance.Alltheotherserializersflattenthe

structureouttoatree.

DeserializationTime（“deser+deep”）

Oftenthemostexpensiveoperation.Tomakeafaircomparison,all

fieldsofthedeserializedinstancesareaccessed–thisforceslazy

deserializerstoreallydotheirwork.Therawdatabelowshows

additionalmeasurementsfordeserialization.

SerializedSize（“size”）

Thesizeoftheserializeddata.Thesenumbersmayvarydependingontheexactdatavaluebeingused.

Java’sbuilt-inserializerstoresthefullclassnameinserialized

form.Soyoudon’tneedtoknowaheadoftimewhatkindofobject

you’rereadingin.

The‘scala’test,whichusesJava’sbuilt-inserialization,yieldsa

largerserializedrepresentationbecauseitusuallycreatesmoreJava

classesunderthehood.

SerializationCompressedSize（“size+dfl”）

ThesizeoftheserializeddatacompressedwithJava’sbuilt-inimplementationofDEFLATE（zlib）.

ObjectCreationTime（“create”）

Objectcreationisnotsomeaningfulsinceittakesinaverage100

nanotocreateanobject.However,thedifferenttoolsvaryinhow

“fancy”theirobjectsare.SomejustcreateaplainJavaclassandlet

youaccessfieldsdirectly,whileothershaveset/getmethods,while

othersusethe“builder”pattern.

ProtobufandThriftusethe“builder”patterntocreateobjects,whichmakestheoperationmoreexpensive.

AvrostoresStringsinUTF8form.ThetimetakentoconvertfromJava“String”valuestoUTF-8

isincludedunder“create”,“ser”,“deser+shal”,and“deser+deep”,

whichisn’tquiterepresentativeofreal-worldusage.Realcodethat

usesAvromightbeabletokeepstringsinUTF-8

form,thusavoidingtheneedtoconvertbackandforth（inwhichcase

the“ser+same”and“deser”resultsmightbemoreaccuratereflectionsof

Avro’sperformance）.

Numbers

Timesareinnanoseconds,sizesareinbytes.

createser+samedeser+shal+deeptotalsize+dfl

protobuf482411520872428251627316846239149

thrift408413938694609485148949032349195

thrift-compact406402835414881499752439271240149

protobuf/activemq+alt3684006923144427796784239149

protobuf/protostuff356139911232197227724363835239149

protobuf/protostuff-runtime225174516122228251025854330241150

protostuff-core-ge358132810672265234524863814239150

protostuff-runtime-ge225168615392273255226174303241151

kryo225210819482309238324684577233147

kryo-opt225200218522112218822614263219135

avro18574674275860657222800112675221133

avro-generic23805226252055576864793513161221133

hessian221110221008311824120081196322985501313

java-built-in224130251173859070595375975972785889517

java-manual225180816641301137814783285255147

scala/java-built-in75620788178558867689203898511106401312700

scala/sbinary748421433222900306133707583255147

json/jackson-manual2226648650445254481457411222398220

json/jackson-databind231104571010564016508667017127503270

json/protostuff3617749707349335049520812957382194

json/protostuff+numeric3577934749747874955510113036360191

json/protobuf5072228721118117870120792121540143828488253

json/google-gson2418225781695133003135203135314217571486259

xml/manual-woodstox2397031686894379704991716948495267

xml/manual-aalto2394680417959106031613510815495267

xml/manual-fastinfo224142451401716293170321730931553333250

xml/xstream2368532282668141576142139141402226724758313

xml/xstream+c229151401401049303493324780262942381205

woodstox-xstream2398759584340141817142207140461228056796344

woodstox-xstream+c221126741135524154243032457937253419236

aalto-xstream2258594682487137690140350138958224903796344

aalto-xstream+c22310812949516718169151733928151419236

fastinfo-xstream235104124100900123098124063123837227961444323

fastinfo-xstream+c234202511877623823241492432544576293227

xml/javolution2195732554688518926897114703432239

Columns:

create:

createanobject（usingtheclassesspecifiedbytheserializationtool）

ser:

createanobjectandserializeit

+same:

serializethesameobject（i.e.doesn’tincludecreationtime）

deser:

deserializeanobject

+shal:

deserializeanobjectandaccessthetop-levelfields

+deep:

deserializeanobjectandaccessallthefields

total:

create+serialize+deserializeandaccessallfields

size:

thesizeoftheserializeddata

+dfl:

thesizeoftheserializeddatacompressedwithJava’sbuilt-inimplementationofDEFLATE（zlib）