跟老韩学UbuntuServer2204vmstat指令帮助

　　vmstat指令帮助手册
　　vmstat可查看ubuntlinux的综合性能，是每个从事Linux人员必知必会、需掌握的核心指令之一。
　　vmstat指令帮助手册如下。VMSTAT（8）SystemAdministrationVMSTAT（8）NAMEvmstatReportvirtualmemorystatisticsSYNOPSISvmstat〔options〕〔delay〔count〕〕DESCRIPTIONvmstatreportsinformationaboutprocesses，memory，paging，blockIO，traps，disksandcpuactivity。Thefirstreportproducedgivesaveragessincethelastreboot。Additionalreportsgiveinformationonasamplingperiodoflengthdelay。Theprocessandmemoryreportsareinstantaneousineithercase。OPTIONSdelayThedelaybetweenupdatesinseconds。Ifnodelayisspecified，onlyonereportisprintedwiththeaveragevaluessinceboot。countNumberofupdates。Inabsenceofcount，whendelayisdefined，defaultisinfinite。a，activeDisplayactiveandinactivememory，givena2。5。41kernelorbetter。f，forksThefswitchdisplaysthenumberofforkssinceboot。Thisincludesthefork，vfork，andclonesystemcalls，andisequivalenttothetotalnumberoftaskscreated。Eachprocessisrepresentedbyoneormoretasks，dependingonthreadusage。Thisdisplaydoesnotrepeat。m，slabsDisplaysslabinfo。n，oneheaderDisplaytheheaderonlyonceratherthanperiodically。s，statsDisplaysatableofvariouseventcountersandmemorystatistics。Thisdisplaydoesnotrepeat。d，diskReportdiskstatistics（2。5。70oraboverequired）。D，disksumReportsomesummarystatisticsaboutdiskactivity。p，partitiondeviceDetailedstatisticsaboutpartition（2。5。70oraboverequired）。S，unitcharacterSwitchesoutputsbetween1000（k），1024（K），1000000（m），or1048576（M）bytes。Notethisdoesnotchangetheblock（bibo）fields，whicharealwaysmeasuredinblocks。t，timestampAppendtimestamptoeachlinew，wideWideoutputmode（usefulforsystemswithhigheramountofmemory，wherethedefaultoutputmodesuffersfromunwantedcolumnbreakage）。Theoutputiswiderthan80charactersperline。V，versionDisplayversioninformationandexit。h，helpDisplayhelpandexit。FIELDDESCRIPTIONFORVMMODEProcsr：Thenumberofrunnableprocesses（runningorwaitingforruntime）。b：ThenumberofprocessesblockedwaitingforIOtocomplete。MemoryTheseareaffectedbytheunitoption。swpd：theamountofswapmemoryused。free：theamountofidlememory。buff：theamountofmemoryusedasbuffers。cache：theamountofmemoryusedascache。inact：theamountofinactivememory。（aoption）active：theamountofactivememory。（aoption）SwapTheseareaffectedbytheunitoption。si：Amountofmemoryswappedinfromdisk（s）。so：Amountofmemoryswappedtodisk（s）。IObi：Blocksreceivedfromablockdevice（blockss）。bo：Blockssenttoablockdevice（blockss）。Systemin：Thenumberofinterruptspersecond，includingtheclock。cs：Thenumberofcontextswitchespersecond。CPUThesearepercentagesoftotalCPUtime。us：Timespentrunningnonkernelcode。（usertime，includingnicetime）sy：Timespentrunningkernelcode。（systemtime）id：Timespentidle。PriortoLinux2。5。41，thisincludesIOwaittime。wa：TimespentwaitingforIO。PriortoLinux2。5。41，includedinidle。st：Timestolenfromavirtualmachine。PriortoLinux2。6。11，unknown。FIELDDESCRIPTIONFORDISKMODEReadstotal：Totalreadscompletedsuccessfullymerged：groupedreads（resultinginoneIO）sectors：Sectorsreadsuccessfullyms：millisecondsspentreadingWritestotal：Totalwritescompletedsuccessfullymerged：groupedwrites（resultinginoneIO）sectors：Sectorswrittensuccessfullyms：millisecondsspentwritingIOcur：IOinprogresss：secondsspentforIOFIELDDESCRIPTIONFORDISKPARTITIONMODEreads：Totalnumberofreadsissuedtothispartitionreadsectors：Totalreadsectorsforpartitionwrites：Totalnumberofwritesissuedtothispartitionrequestedwrites：TotalnumberofwriterequestsmadeforpartitionFIELDDESCRIPTIONFORSLABMODEcache：Cachenamenum：Numberofcurrentlyactiveobjectstotal：Totalnumberofavailableobjectssize：Sizeofeachobjectpages：NumberofpageswithatleastoneactiveobjectNOTESvmstatdoesnotrequirespecialpermissions。Thesereportsareintendedtohelpidentifysystembottlenecks。Linuxvmstatdoesnotcountitselfasarunningprocess。Alllinuxblocksarecurrently1024bytes。Oldkernelsmayreportblocksas512bytes，2048bytes，or4096bytes。Sinceprocps3。1。9，vmstatletsyouchooseunits（k，K，m，M）。DefaultisK（1024bytes）inthedefaultmode。vmstatusesslabinfo1。1FILESprocmeminfoprocstatprocstatSEEALSOfree（1），iostat（1），mpstat（1），ps（1），sar（1），top（1）BUGSDoesnottabulatetheblockioperdeviceorcountthenumberofsystemcalls。AUTHORSWrittenbyHenryWareal172yfn。ysu。edu。FabianFrdrickffrederickusers。sourceforge。net（diskstat，slab，partitions。。。）REPORTINGBUGSPleasesendbugreportstoprocpsfreelists。orgprocpsng20200604VMSTAT（8）