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Understandable OS No6 Virtual Memory Japanese Edition

 
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MessagePosté le: Sam 8 Juil - 03:22 (2017)    Sujet du message: Understandable OS No6 Virtual Memory Japanese Edition Répondre en citant


Understandable OS No6: Virtual Memory (Japanese Edition)
by Yutaka Shirai
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bound: 30 pages
publisher: YutakaSouzousha (March 1, 2017)
lang: Japanese
asin: B06XCP7VPK
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filesize: 3883 KB




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Allocating...physical...memory...for...a...process...involves:...reserving...a...memory...segment...in...physical...memory,...and...attaching...the...physical...memory...segment...to...the...virtual...address...space,...that...is,...reserving...a...memory...segment...of...the...same...size...in...the...virtual...address...space...for...the...process,...and...mapping...the...virtual...addresses...to...the...corresponding...physical...addressesDuring...startup...of...a...computing...platform,...e.g.,...a...J2EE...application...server...instance,...extended...memory...windows...are...created...to...reserve...virtual...address...space...in...which...to...map...extended...memory...contextsThe...objects...may...be...determined...to...be...currently...not...in...use...by...the...applicationThe...window...comprises...a...shared...memory...context...to...be...shared...by...a...plurality...of...worker...processes...in...an...application...server...instance,...and...at...least...a...second,...private...memory...context...to...be...attached...to...only...one...of...the...plurality...of...worker...processes...in...the...application...server...instanceThe...virtual...persistent...heap...may...use...a...single...garbage...collector...126,...which...may...be...advantageous...for...devices...with...memory...and...CPU...constraints,...for...example,...small...appliance...and...consumer...devices1...illustrates...an...extended...memory...window...and...corresponding...resource...as...used...by...an...embodiment...of...the...invention;...FIGIn....one....embodiment,....a....page....table....122....and....offset....based....address....translation....may....be....used....to....convert....virtual....heap....110....references....into....in-memory....heap....108....referencesAn...example...of...a...method...for...computing...the...in-memory...heap...address...is:...Hadd...=...HeapPagelD...*...PageS...+...Sadd...&...PageMask...PageS:...Page...size...Sadd:...The...original...virtual...heap...page...reference...address...PageMask:...Page...Size...bit...mask...&:...Bitwise...AND...operator...First,...the...heap...page...ID...produced...in...step...302...may...be...multiplied...by...the...page...size...to...produce...the...base...address...of...the...in-memory...heap...pageIn....the....case....of....a....heap....context,....a....heap....manager....is....used....to....manage....fine....granular....memory....allocations....(e.g.,....allocations....with....a....few....bytes....can....be....satisfied,....where....the....extended....memory....layer....705....may....only....handle....allocations....with....multiples....of....the....block....size7A..cache..miss..occursAt..certain..times,..a..checkpoint..for..application..104..may..be..written..to..persistent..store..space..120A..memory..architecture..includes..at..any..given..point..in..time..a..contiguous..memory..window..located..at..a..fixed..virtual..address..space..comprising..a..first..context..to..be..shared..by..a..plurality..of..worker..processes..in..an..application..server..instance..and..at..least..a..second..context..to..be..attached..to..only..one..of..the..pluralityA..."virtual...machine"...may...be...defined...as...an...operating...environment...that...sits...on...top...of...one...or...more...other...computer...platforms,...and...provides...the...capability...to...run...one...binary...file...on...the...virtual...machine...on...the...one...or...more...other...computer...platformsIn..one..embodiment..of..the..virtual..heap,..the..entire..heap..for..a..process..may..be..made..persistentIn....one....embodiment,....the....virtual....heap....may....be....maintained....on....non-volatile....memory....storage....external....to....the....device....running....the....virtual....machine,....and....portions....of....the....heap....for....the....current....execution....state....of....the....process....may....be....cached....in....and....out....of....a....'physical'....heap....resident....in....local....memory....on....the....deviceIn...one...embodiment,...a...garbage...collector...may...use...both...working...sets...to...implement...a...generational...garbage...collection...policy...and...heap...regions...with...different...flushing...policies...such...as...nursery...regionsObjects...in...JavaSpaces...are...stored...in...Java...Serialization...FormatStore..Checkpoints..and..Consistency..Having..pages..checkpointed..individually..may..be..insufficient..to..maintain..the..consistency..of..the..virtual..heap..110..in..store..120

Alternatively,...these...functions...may...be...performed...by...specific...hardware...components...that...contain...hardwired...logic...for...performing...the...functions,...or...by...any...combination...of...programmed...computer...components...and...custom...hardware...componentsA..valid..address..may..mean..the..corresponding..address..is..resident..in..the..in-memory..heapBuffering..may..not..be..an..option..in..a..tight..memory..environmentIf....there....is....insufficient....memory....in....the....store....heap....for....the....cache....lines,....more....memory....may....be....made....available....in....the....store....heap....by....one....or....more....of....several....methodsIn-memory...heap...108...and...virtual...heap...110...may...be...divided...into...one...or...more...sectionsHowever,..any..programming..language..can..be..supported..by..a..Jini..system..if..it..has..a..compiler..that..produces..compliant..bytecodes..for..the..Java..programming..languageThe...article...of...manufacture...of...claim...13,...including...additional...program...code...which,...when...executed...by...the...machine,...causes...the...machine...to...perform...the...additional...operation...of:...subsequent...to...mapping...the...context,...using...an...extended...memory...manager...to...extend...the...block...size...of...the...contiguous...memory...window...by...n...blocksThe....database....store....method....may....provide....a....mechanism....to....cache....portions....of....the....virtual....persistent....heap....into....the....in-memory....physical....heap....for....the....virtual....machineIf...a...closure...with...a...non...shareable...object...were...to...be...stored...in...shared...memory,...the...closure...itself...would...not...be...shareable...with...other...virtual...machines,...which,...again,...defeats...the...purpose...of...the...shared...memoryWith....reference....to....FIGThe...method...of...claim...1,...wherein...the...process...is...executing...in...a...first...memory...space...comprised...in...the...virtual...machine;...wherein...the...in-memory...heap...is...comprised...in...the...first...memory...space;...wherein...a...total...size...of...the...store...heap...is...greater...than...available...memory...space...in...the...first...memory...space;...and...wherein...the...store...heap...is...comprised...in...a...second...memory...spaceThe...process...of...converting...heap...addresses...is...illustrated...in...Figure...4 07f867cfac



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