交换空间管理和技巧

交换空间管理和技巧

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时间:2019-01-07

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1、交换空间管理和技巧Swapspacemanagementandskills2007-01-1811:25:52theLinuxfederationcollectsConfigureswapspace(ineludingaddingspaceinanemergency)tomakethemostofyoursystem・Inthisarticle,you'11learnhowtomonitorthesystemtodeterminetheeffectiveexchangeofspaceconfigurationdata,andtheresearchwillsw

2、apspaceisnotonlyusedasauxiliarymethodofrandomaccessmemory(RAM).HowdoesUNIXuseswapspaceAllUNIXoperatingsystemssupportsomekindofvirtualmemory(VM)system・UsetheVMsystem,youhavetwomainareatostoreinformationaboutactiveapplicationanduseofdata一physicalrandomaccessmemory(RAM)andthedistribut

3、ionofharddrivespace.IncomputerswithVM,theapplicationcanbeloadedintomemoryanddataamountcanbegreaterthanthephysicalRAM,becausethereisnoactivityistousetheapplicationandinformationexchangeonthedisk(swapspaceThetermhencethename)・TheadvantageoftheVMsystemisthatphysicalRAMismoreefficient-

4、一becauseitcontainsonlytheapplicationsbeingexecutedandthedatabeingused・BecauseRAMisfasterthanaharddiskspace,youfromtheactivetoloadintheapplicationoftherequiredperformance,canalsobenefitfromtherunningapplicationsupportedbymorethanusua1.Asaresult,yougetamuchlargeraddressablememoryspac

5、e(in32forsystemfor4gb,ona64-bitsystemislarger),soastomaketheapplicationdevelopmenteasier,whilestillprovidinghighperformance・SetswapspacevaluesTheamountofswapspaceyouconfigureonthecomputerdependsontheapplicationandtheoperatingsystem・Iftheswapspaceistoosmall,itmaynotbeabletorunallyou

6、wanttoruntheapplication,andiftheswapspaceistoobig,maybeawasteofthosewhohaveneveruseddiskspace・Youmayalsoindirectlymakesthesystemoverloads,becausecomparedwithtoolittlespace,toomuchswapspacecanleadtopoorperformance,thisisbecausewiththesystem,comparedtoperformtheactualprocessingtimesp

7、entitinandoutinthemoretimespentonapage・DifferentUNIXvariantsusetheirswapspaceindifferentways・Somevariantsuseswapspaceonlywhenphysicalmemoryisalreadyused・Othervariantsuseswapspaceforallnon-activeapplicationsandunusedpages・Somevariationskeepcopiesofthedatainallapplications--including

8、applicationsinbothmemoryan

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