IOzone使用指南

《IOzone使用指南》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、IozoneFilesystemBenchmarkIOzoneisafilesystembenchmarktool.Thebenchmarkgeneratesandmeasuresavarietyoffileoperations.Iozonehasbeenportedtomanymachinesandrunsundermanyoperatingsystems.Thisdocumentwillcoverthemanydifferenttypesofoperationsthataretestedaswellascoverageofallofthecomm

2、andlineoptions.Iozoneisusefulfordeterminingabroadfilesystemanalysisofavendor’scomputerplatform.ThebenchmarktestsfileI/Operformanceforthefollowingoperations.Read,write,re-read,re-write,readbackwards,readstrided,fread,fwrite,randomread/write,pread/pwritevariants,aio_read,aio_writ

3、e,mmap,Whilecomputersaretypicallypurchasedwithanapplicationinminditisalsolikelythatovertimetheapplicationmixwillchange.Manyvendorshaveenhancedtheiroperatingsystemstoperformwellforsomefrequentlyusedapplications.AlthoughthisacceleratestheI/Oforthosefewapplicationsitisalsolikelyth

4、atthesystemmaynotperformwellforotherapplicationsthatwerenottargetedbytheoperatingsystem.Anexampleofthistypeofenhancementis:Database.Manyoperatingsystemshavetestedandtunedthefilesystemsoitworkswellwithdatabases.Whilethedatabaseusersarehappy,theotherusersmaynotbesohappyastheentir

5、esystemmaybegivingallofthesystemresourcestothedatabaseusersattheexpenseofallotherusers.Astimerollsonthesystemadministratormaydecidethatafewmoreofficeautomationtaskscouldbeshiftedtothismachine.Theloadmaynowshiftfromarandomreaderapplication(database)toasequentialreader.Theusersma

6、ydiscoverthatthemachineisveryslowwhenrunningthisnewapplicationandbecomedissatisfiedwiththedecisiontopurchasethisplatform.ByusingIozonetogetabroadfilesystemperformancecoveragethebuyerismuchmorelikelytoseeanyhotorcoldspotsandpickaplatformandoperatingsystemthatismorewellbalanced.F

7、eatures:·ANSII‘C’source.·POSIXasyncI/O.·Mmap()fileI/O.·NormalfileI/O.·Singlestreammeasurement.·Multiplestreammeasurement.·POSIXpthreads.·Multi-processmeasurement.·Excelimportableoutputforgraphgeneration.·I/OLatencydataforplots.·64-bitcompatiblesource.·Largefilecompatible.·Stone

8、wallinginthroughputteststoeliminatestragglereffects.·P