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ID:9377507
大小:336.00 KB
页数:10页
时间:2018-04-29
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1、Ext2onSingularityScottFinleyCS736SemesterProjectReport–Spring2008UniversityofWisconsin–MadisonAbstractSingularityisanewoperatingsystemproducedbyMicrosoftResearch.ThedesignofSingularityisamarkeddeparturefromcurrentcommodityoperatingsystemssuchasWindowsorLinux.Thispaperpresentsan
2、dimplementationoftheLinuxext2filesystemforuseonSingularity.ThisprojectallowsthedesignofSingularitytobeevaluated.ThedevelopmentandtestingdescribedinthispapershowthattheSingularitydesigngoalsofhighdependabilityand“goodenough”performancearelargelymet.Theprotectionprovidedbythemicr
3、okerneldesignpreventedtheSingularitykernelfromcrashinginthefaceoferrorsintheext2code.Performancetestingshowedthatwhilenotasfastasext2onLinuxperformanceisnotprohibitivelylowandtheoverheadofgarbagecollectionisminimal.1IntroductionSingularityisanewoperatingsystemreleasedbyMicrosof
4、tResearch.Itisintendedasaplatformtoinvestigatenewideasinoperatingsystemstructure.ManyofthedesigndecisioninSingularityrepresentadramaticdeparturefrommainstreamoperatingsystemssuchasWindowsorLinux[1].EvaluatingSingularity’sdesignpresentsachallengebecauseexistingapplicationsandlib
5、rariesmustbere-writtentobeported.OneresultofthisissueisthatFAT32istheonlyfilesystemthatissupported.ThisleavesSingularitywithoutafilesystemwhichcanmeettheIOdemandsofabenchmarksuchasSpecWeb99.SingularityprovidesbetterresponsetimethanWindowsinthisbenchmark,butcannotmatchthetotalsi
6、multaneoususersbecauseofthebottleneckoftheFATfilesystem[1].Thispaperdescribestheimplementationandtestingoftheext2filesystemforuseonSingularity.Theworksofarhasfocusedfullysupportingreadsfromext2.Cachingoffilesystemmetadataandrawdiskblocksmakesreadsspeedscomparabletoext2readsonLi
7、nux.Limitedwritesupportwascompleted,primarilytoaidintesting.Writesupporthasnotprogressedtoapointthatmakesaperformanceanalysisworthwhile.ThegoalofthisworkistoevaluatethedesignofSingularity.Integrationofawellknownfilesystemprovidestheopportunitytogaugethedevelopmentexperiencewhen
8、doingsystemprogramminginSingularity.Becausetheresultis
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