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Java ퟔ��z}ViJVMj̃`[jO

 

Java z}ViJVMj́A}CNvZbT Java NX t@C̃oCg R[h suퟸ�� sGWvłBJVM ̃`[jÓAWebLogic Server ƃAvP[ṼptH[}Xɉe^𗂦܂B

ȉ̐߂ł́AJVM ̃`[jO̍lɂ‚Đ־܂B

A ւ̃Nɂ‚ẮA Java z}ViJVMj̏ Q ퟸ��B

 


JVM ̃`[jO̍l

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JVM ̃x_ o[W

WebLogic Server ̓삪ۏ؂ v郃_NV JVM gpퟹ��邱ƁBWebLogic Server 6.x ́AJava 1.3 JVM ̂̂݃T|[gB

遁uvbgtH[ T|[gvy[W͕pɂɍXV A聂܂܂ȃvbgtH[Ɋւ V̓m슔F Lڂ B

遃q[v TCY Kx[W RNṼ`[jO

`[jȌڍׂɂ‚ẮA JVM q[v TCYɂ‚ĂQ B

Kx[W RNVퟸ��`[jO̊Tvɂ‚ẮAuTuning Garbage Collection with the 1.3.1 Java Virtual MachinevQ B

Kx[W RNV

Kx[W RNV朕��‚ĂQ B

NCAg/T[o JVM ퟸ��

WebLogic Server ݂ł́ANCAgƃT[opɈقȂ JVM o郁[Wgpퟹ��fvCgT|[g B遃NCAg/T[o JVM ݂̍̃T|[gɂ‚ẮAuNCAg/T[o JVM ݂̃T|[gvQ B

UNIX XbfBO f

UNIX ퟸ��́AO[ XbhƃlCeBu XbhƂ 2 ‚̃XbfBO fBWebLogic Server 遂ōō̃ptH[}XƃXP[reB𓾂 ́AlCeBu Xbhgpퟹ�� JVM Iퟋ��B

Solaris 遂gpퟹ�� ́AJavaSoft Web ̃TCgɂuThreading Models and Solaris Versions Supported遁vQ B

Just-In-TimeiJITjJVM

WebLogic Server s ퟸ��AJIT RpCgpퟹ��BSun Microsystems 遂 Symantec ǂ قƂ JVM ퟄ��ł́AJIT RpCgp B

ڍׂɂ‚ẮAJVM TvC̃hLgQ B

: Sun ퟸ�� JVM 1.3.x́AJIT IvV͗L ͂ȂȂBB Java z}ViJVMj̏ Q B

 


JVM q[v TCYퟸ��‚

ăKx[W RNV́AJava q[v gp Ȃ Java IuWFNg VM vZX᪜��BJava q[v Java ̓vÕIuWFNg݂Ă łA聃Cu IuWFNgAfbh IuWFNgA t[ ̃|WgłB s̃vOłǂ̃|C^ ANZX Ȃ AIuWFNg̓Kx[Wipj Ȃ B

JVM q[v TCYɂ āAKx[W RNVsퟴ��pxƂ̎Ԃ肳 BKx[W RNV̓K؂Ȏ spx̓AvP[Vɂ ĈقȂ ŁAKx[W RNV̎ ۂ̎Ԃƕpx ퟀ��ĒK镗v B

傫q[v TCY 𐂵ꍇAKx[W RNVŜ͒ᑬ܂A spxႭȂ B̃j[Yɍ킹ăq[v TCY 𐂵ꍇAKx[W RNVŜ͍܂A spxȂ B

q[v TCỸ`[jO̖ڕẂA ԂɏłN郃CAg̐ ퟴ��₵‚AKx[W RNV̎ sԂ ퟀ��ɗ}邱ƂłB

x`}[Nɍō̃ptH[}X ퟁ�� ́A傫q[v TCYl 𐂵Ax`}[N̎ sɃKx[W RNV s 悤ɂ܂B

q[v̈悪sĂ A Java ̃G[\ B

java.lang.OutOfMemoryError <<no stack trace available>>
java.lang.OutOfMemoryError <<no stack trace available>>
Exception in thread "main"

q[v̈l撂 X 𕂁A q[v TCYl̎w QƂĂB

 


Kx[W RNVɂ‚

Java HotSpot JVM 1.3 Ăł́A Kx[W RNVgp BlCeBu Kx[W RNVł̓q[v ׂẴCu IuWFNgׂ ܂A Kx[W RNVł͗]ȍ ퟀ��AIuWFNg̗L Ԃl B

q[v́ANewAOld Ƃ 2 ‚̐ BNew A Eden 2 Ƃ‚̃ToCö ו BEden ́AVIuWFNg蓖Ă BKx[W RNV s ƁAEden Cu IuWFNgׂ͗̃ToCö Rs[ BIuWFNg͍ő債l𒴉߂ ŁÂ悤ɃToCö ŃRs[Aꁂ̌ANew し̈悩 Old ړ BNew 您 Old TCYƔ䗦̎w ‚ẮA q[v TCYl̎w QƂĂB

̃IuWFNǵA蓖Ă Kx[WɂȂ B̂悤ȃIuWFNǵAup vIuWFNgƌĂ΂ BIuWFNg̗L ԂȂ ǁAKx[W RNV̎ s񐔂AKx[W RNV͒ᑬ܂BAvP[VIuWFNg p𕕓xɂ āAKx[W RNV̎ spx܂ B”\ł AVIuWFNg AIuWFNgLퟌ��bVčėp ɂĂB

IuWFNg̑唼̗L ԂZƂ𗝉ퟋ�� AKx[W RNV ퟀ�� `[jOł܂BP㒈ʂŃǗsퟴ��ꍇà v[ ퟀ�� قȂI郃uWFNg ퟁ��BKx[W RNV͐ゲƂɃv[BςɂȂ s BIuWFNg̑唼̗L Ԃ 1 ퟀ��RNV Z AKx[W RNV ퟀ��܂B TCYƁAKx[W RNV̎ spxBAptH[}Xቺ܂B

Kx[W RNṼ`[jO̊Tvɂ‚ẮAuTuning Garbage Collection with the 1.3.1 Java Virtual MachinevQ ퟸ��B

 


q[v TCY̌

肱̐߂ł́Ał Iȃq[v TCYퟰ��肷 {菇ɂ‚Đ־܂B

  1. AvP[V sɁAő ׂ퟊�� WebLogic Server ퟍ��̃ptH[}Xퟌ��j^܂B

  2. -verbosegc IvVgpퟹ��āAKx[W RNVɓ 鎞Ԃƃ\[X𐳊mɑ肵܂B

  3. Java VM verbose ̃Kx[W RNVo͂L 𗌂AWG[ Wo̗͂ O t@CɃ_CNg܂B

    verbose Kx[W RNV̗L o͂̃_CNgQ ퟸ��B

  4. ȉɂ‚ĉ ퟁ��B

    1. Kx[W RNV̎ spxBweblogic.log t@CŁAKx[W RNVO ^C X^v rퟁ��B

    2. Kx[W RNV̎ sԁBKx[W RNVŜ̎ sԂ 3 ́` 5 b ퟄ��͂܂B

    3. 񁕽σL藗ʁB‚܂A聊eKx[W RNV s q[v̏ ퟍ��Bq[v̋󂫂 85% ɂȂ Aq[v TCY퟾��Ă©܂܂B

  5. Java HotSpot JVM 1.3 gp񁂂 ́A TCY 𐂵܂B

    q[v TCYl̎w

  6. q胁[v TCYVXe̎gp”\ȋ RAM 󂫂 傫Ȃ 悤ɂ܂B

    y[WfBXNɁuXbvv ͈͂ŁAł邾傫q[v TCY 𐂵܂BVXe̋ RAM 󂫂̗eʂ́An[hEFÃRtBO[VƁÃ}V s v郃ZX̃vɂ ĈقȂ BVXe̋ RAM 󂫂̗eʂ̌ ‚ẮAVXeǗ҂ɖ₢킹ĂB

  7. VXeKx[W RNVɔ Ԃ i蓖Ă uzv RAM ퟊��łȂꍇjAq[v TCY퟾��܂B

    ʏA큎gp”\ RAMȁiIy[eBO VXe܂͂̑̃vZXɂ ĐL藂 RAMj 80% ̂ JVM ퟉��Ă܂B

  8. c RAM ̗eʂ傫ꍇ́Ã}Vł WebLogic Server ̂ sퟀ��B

q[v TCYl̎w QƂĂB

verbose Kx[W RNV̗L o͂̃_CNg

̐߂ł́Aff̂߂ verbose ɃKx[W RNVL 𗌂Ao͂ퟌ��O t@CɃ_CNg @ɂ‚Đ־܂B

  1. ̎菇̗ 悤ɁAWebLogic Server Nퟭ��ƂɁAJava VM verbose ̃Kx[W RNVo͂L 𗌂܂B

  2. WG[ƕWo̗͂ O t@CɃ_CNg܂B

    _CNg邱Ƃɂ AXbh _v WebLogic Server ̏ bZ[WƃG[ bZ[WɊ֘AăOɋL^ ̂ŁAff ɃO t@C 𗧂܂B

    ɗ ܂B

    % java -ms64m -mx64m -verbosegc -classpath $CLASSPATH
    -Dweblogic.domain=mydomain -Dweblogic.Name=clusterServer1
    -Djava.security.policy==/bea/weblogic6x/lib/weblogic.policy
    -Dweblogic.management.server=192.168.0.101:7001 -Dweblogic.management.username=system
    -Dweblogic.management.password=systemPassword weblogic.Server >> logfile.txt

HPUX ł́ÃIvVgpퟹ�� stderr stdout Ă 1 ퟀ��t@CɃ_CNg܂B

-Xverbosegc:file=/tmp/gc$$.out

$$ ł́AJava vZX PID ̂Ƀ}bv Bo͂ɂ̓Kx[W RNV̎ sԂퟺ��^CX^v܂܂ ŁAKx[W RNV̎ spx𐄑ł܂B

Solaris ł́ÃR}h sퟀ��B

weblogic.Server > server.out 2>&1

 


q[v TCYl̎w

Java q胁[v TCY̒ĺAJava R}hC WebLogic T[oNퟭ�� Ɏw ܂Bɗ ܂B

$ java ... -XX:NewSize=128m -XX:MaxNewSize=128m -XX:SurvivorRatio=8 -Xms512m -Xmx512m

̒l̃ftHg TCY̓oCgPʂŎw肳 BKBiLoCgjퟺ��ɂ́AlɁukv܂́uKvt 𕉂BlɁAMBiKoCgjퟺ��ɂ́umv܂́uMvAGBiퟄ��MKoCgjퟺ��ɂ́ugv܂́uGvt 𕉂B

̃p[^́AWebLogic Server ̋NXNvg ‹XNvg̉e ퟸ��ƂɒӂK镗v BWebLogic zzLbgɂ́AftHg T[oNퟭ��T郃v XNvgA T[o\zퟵ�� s肷邽߂̊‹ 𐂷T郃v XNvgtĂ܂B

̃XNvǵA ۂ̊‹A⃃vP[Vɍ킹ďCK镗v BuWebLogic Server ̋Nƒ~⎁vQ ퟸ��B

Java q[v TCỸIvV

ō̃ptH[}X𓾂 ́AAvP[V ퟀ��Ƀ`[jO܂B܂A \ 2-2 Ɏ JVM q郁[v TCỸIvVRퟌ��tBO[V AقƂ ퟄ��AvP[VŃptH[}X ܂B

\ 2-2 Ɏ I郃vV́AgpA郁[LeN` Iy[eBO VXeɂ ĈقȂ BvbgtH[ʂ JVM ̃`[jO IvVɂ‚ẮAx_̃}jAQ ퟸ��B

\2-2 Java q[v TCỸIvV

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New q[v TCY 𐂷B

-XX:NewSize

遂̃IvVgpퟹ�� ANew Java q[v TCY B��̒ĺA1MB 傫 1024 ̔{ɐݒ肷B遈 -XX:NewSize ɂ́Aőq僁[v TCY 4 ̕ 1 ̂̃TCYɂȂ ɐݒ肷B遗L Ԃ̒ZIuWFNgꍇقǁÃIvV̒l B

𑁃vZbTB ǁANew 傫ݒ肷K镗vB遃̊蓖Ă͕񏈗ł邪AKx[W RNV͕񏈗 B

New őq僁[v TCY 𐂷B

-XX:MaxNewSize

遂̃IvVgpퟹ�� ANew ő Java q僁[v TCY B��̒ĺA1MB 傫 1024 ̔{ɐݒ肷B

New 遐 q[v TCY䗦 𐂷B

-XX:SurvivorRatio

New 遐 A3 ‚̃TüA恂‚܂ Eden ATCY 2 ̂‚̃ToCö B

-XX:SurvivorRatio=X IvVgpퟹ�� AEden ƃToCö TCY䗦Rퟌ��tBO[VłB遂̒l 8 ͂ɐݒ肵ǍAぃKx[W RNVퟌ��j^ ɂB

遍ŏq[v TCY 𐂷B

-Xms

遂̃IvVgpퟹ�� A蓖ăv[̍ŏTCY B��̒ĺA1MB 傫 1024 ̔{ɐݒ肷B遈 ɁAŏq[v TCYi-Xmsj͍őq僁[v TCYi-XmxjƓ傫ɐݒ肷B

遍őq僁[v TCY 𐂷B

-Xmx

遂̃IvVgpퟹ�� Aő Java q僁[v TCY B��̒ĺA1MB 傫 1024 ̔{ɐݒ肷B

 


遃Kx[W RNV̋

T[oŃKx[W RNVퟮ��O鑂ɁASȃKx[W RNVKvł邱ƂmFퟩ��ĂBKx[W RNVퟮ�� AJVM ł̓q[v ׂẴCu IuWFNgp 𕔒ׂ܂B

Administration Console gpퟹ��āAw肵T[oŃKx[W RNVퟮ�� ́A̎菇ɏ]܂B

  1. Administration Console ̍yCŁAgp󋵂\𕎦T郁[õT[o CX^X m[hNퟌ��bN܂B̃CX^XƊ֘At Ă^郃uퟺ��_CAOEyCɕ\ B

  2. [j^] ^uNퟌ��bN܂B

  3. [ptH[}X] ^uNퟌ��bN܂B

  4. [gp] 󋵃OtŎgpȂBĂ邩ǂmFퟩ��܂B

    [gp] 󋵃Otɂ́A s̃T[o̎gp󋵂݂̂\ B

  5. Kx[W RNVퟮ�� ́A[Kx[WRNVퟮ��] NbN܂B

    RNV IƂퟺ��bZ[W\ B

 


Java HotSpot VM IvV̐ݒ

W蕏 Java ̃IvVgpퟹ��āAptH[}X ퟰ��邱Ƃł܂B ̃IvV̎g AgpA郃vP[ṼR[fBOɂ ĈقȂ BR}hC IvV̓vbgtH[Ԃň AvbgtH[ɂ Ă̓ftHgقȂ   B

NCAg JVM ƃT[o JVM ̗ eXgāAR AvP[Vɑ΂āA ptH[}X̗Dꂽ JVM 𒲂ׂK镗v B

ptH[}X ퟰ��A遂 O VM ̃IvVɂ‚ẮA W񕏀 Java R}h C IvV̐ݒ QƂĂB

NT p̕WIvV

NT ̏ꍇAWebLogic Server ł Java ̓R}hgpퟹ�� JVM ĂNퟭ��ł܂B \ 2-3 Ɏ I郃vVgpퟹ��܂B

\2-3 NT HotSpot VM p̕WIvV

IvV

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-hotspot

HotSpot NCAg VM I B

-server

HotSpot ��T[o VM I B

-classic

��NVbN VM I B

UNIX ��p̕WIvV

UNIX ̏ꍇAWebLogic Server ł Java ̓R}hgpퟹ�� JVM ĂNퟭ��ł܂B \ 2-4 Ɏ I郃vVgpퟹ��܂B

\2-4 UNIX HotSpot VM p̕WIvV

IvV

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-client ܂ -hotspot

HotSpot ̓NCAg VM I B

-server

HotSpot ��T[o VM I B

 


��W񕏀 Java R}h C IvV̐ݒ

W Java ̃IvVgpퟹ��āAptH[}X ퟰ��邱Ƃł܂B ̃IvV̎g AgpA郃vP[ṼR[fBOɂ ĈقȂ BR}hC IvV̓vbgtH[Ԃň AvbgtH[ɂ Ă̓ftHgقȂ   B

NT p̔W񕏀IvV

\ 2-5 ɁANT HotSpot VM ŃptH[}X ퟰ�� WIvV̗ ‚܂B

\2-5 NT HotSpot VM p̔W񕏀IvV

IvV

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-Xnoclassgc

̃IvV́ANX̃Kx[W RNV𖳌 āÃNXւׂ̂Ă̎QƂ ̃NXQƂꂽƂɁÃNX̍ă[hh𖂮B̃IvVł́Aq[v TCY K𑕗vB

-oss

遂̃IvV́AJava Xbh̃X^bN TCY 𐂷B遑傫l钁i>2MBj 𐂷 AptH[}X啝ɒቺB

-ss

遂̃IvV́AlCeBu Xbh̃X^bN TCY 𐂷B遑傫l钁i>2MBj 𐂷 AptH[}X啝ɒቺB

-Xverbosegc:file=/tmp/gc$$.out

遂̃IvV́A-verbosegc bZ[Wt@ퟌ��CɃ_CNgāAKx[W RNV bZ[W stderr c bZ[W򂕪B

遂܂ÃIvVgpퟹ�� AptH[}X B遂 At@Cւ݂̏̃obt@Astderr Ȃǂ̕Xg[ւ݂̏̃obt@ ł邽߁B

verbose Kx[W RNV̗L o͂̃_CNgQΏƁB

Solaris p̔W񕏀IvV

uSolaris VM p̔W񕏀IvVvQ ퟸ��B

 

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