基于nmon的PowerHA宕机分析Word格式文档下载.docx

基于nmon的PowerHA宕机分析Word格式文档下载.docx

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选项官方解释5

分项解析5

小结6

NMON---memuse选项6

选项官方解释6

分项解析7

小结8

NMON-net选项8

选项官方解释8

分项解析9

小结9

NMON—page选项9

选项官方解释9

分项解析10

小结12

NMON-topas选项12

选项官方解释12

Interpretingthe%ProcessorbyPIDchart14

分项解析15

小结16

总结17

概述

本分析文档是基于nmon命令抓取的日志来进行的，从0点开始，每两分钟抓取一次，共抓取24小时。

本文档采用了3月31日和4月1日的日志内容，主机为jddbs02

NMON—mem选项

选项官方注释

ThemaingraphonthissheetshowstheamountofRealFreememoryinMbytesbytimeofday.Thiswouldbethesameasdividingthefrevaluesreportedbyvmstatoverthesameintervalby256.Thesmallgraphshowstheamountofrealmemory.Thisisusefulindeterminingifdynamicreconfigurationhasbeenusedduringthecollectionperiod.

ForAIX,othercolumnsonthesheetareasfollows:

RealFreethepercentageofrealpagesonthefreelist.

VirtualFreethepercentageofunallocatedvirtualslotsonthepagingspaces.

RealFree（MB）theamountofmemoryonthefreelistinMbytes.

VirtualFree（MB）theamountofunallocatedspaceonthepagingspaces.

RealTotal（MB）thetotalamountofmemoryavailabletoAIX.

VirtualTotal（MB）thetotalamountofspaceallocatedforpagingspaces.

Note:

youcancalculatetheamountofmemoryusedduringanintervalsimplybysubtractingtheRealFree（MB）valuefromtheRealTotal（MB）value.Thiswill,however,includefilepages.ThegraphontheMEMUSEsheetgivesamoreaccurateassessmentofmemoryusedbyprograms（computationalpages）.

分项解析

空闲内存率自16点左右，开始大幅度下滑

自16:

02开始，实内存空闲率逐步下滑，到50%左右，自此后再没有增加

小结

自16点开始，内存空闲率在持续降低，也就是说，内存使用率在增长。

NMON—memnew选项

选项官方解释

Thegraphshowstheallocationofmemorysplitintothethreemajorcategories:

pagesusedbyuserprocesses,filesystemcache,andpagesusedbythesystem（kernel）.

Process%thepercentageofrealmemoryallocatedtouserprocesses

FSCache%thepercentageofrealmemoryallocatedtofilesystemcache

System%thepercentageofrealmemoryusedbysystemsegments

Free%thepercentageofunallocatedrealmemory

User%thepercentageofrealmemoryusedbynon-systemsegments

整体上内存的使用率趋于缓和趋势，system项（系统占用）没有增长，process项有平缓的增长趋于。

自16点左右开始，用户使用内存比在持续增加，其他选项未发生变化。

增加的内存使用中，主要是用户类型进程在持续增长。

NMON---memuse选项

Exceptfor%comp,thevaluesonthissheetarethesameaswouldbereportedbythevmtunecommand.

%numpermthepercentageofrealmemoryallocatedtofilepages.

%minpermvaluespecifiedonthevmtunecommandorsystemdefaultof20%.Thiswillnormallybeconstantfortherununlessthevmtuneorrmsscommandsareusedduringcollection.

%maxpermvaluespecifiedonthevmtunecommandorsystemdefaultof80%.Thiswillnormallybeconstantfortherununlessthevmtuneorrmsscommandsareusedduringcollection.

minfreetheminimumnumberofpagesAIXistokeeponthefreelist.Specifiedonthevmtunecommandorsystemdefaultofmaxfree-8.

maxfreethemaximumnumberofpagesAIXisstealinordertoreplenishthefreelist.Specifiedonthevmtunecommandorsystemdefault.

%compThepercentageofrealmemoryallocatedtocomputationalpages.NMON_Analysercalculatesthisvalue.Computationalpagesarethosebackedbypagespaceandincludeworkingstorageandprogramtextsegments.Theyexcludedata,executableandsharedlibraryfiles.

TheAnalysergeneratestwographs.Thefirstshowsthesplitbetweencomputationalandfilepagesbytimeofday.Thesecondplotsthevaluesof%numperm,%minperm,%maxpermand%comp.

If%numpermfallsbelow%minpermthencomputationalpageswillbestolen.If%numpermrisesabove%maxpermthencomputationalpagescannotbestolen.Lowvaluesforboth%minpermand%maxpermindicatethatthesystemhasbeentunedforadatabaseserver.YoumayalsowanttocheckthesettingofSTRICT_MAXPERMontheBBBPsheet（ifpresent）.

从图中可看出，计算内存为发生明显变化，永久内存在16点后开始持续增长，并且增长的内存一直未释放。

如图所示，%numberper和%numclient类型内存，在16点后开始增长，到16点半左右趋于稳定，且后续增长的内存一直未释放。

自16点开始持续增长的内存应是用于了持久性内存，且为网络文件系统类型的（根据numclient得出）

NMON-net选项

Thissheetshowsthedatarates,inKbytes/sec,foreachnetworkadapterinthesystem（includingSPswitchifpresent）.Thisisthesameasproducedbythenetpmon–Oddcommand.NMON_Analyseraddsonecolumnforeachadaptershowingthetotaldatarate（read+write）andtwocolumnsshowingTotalReadandTotalWrite.NotethattheTotalWriteiscalculatedasanegativenumberforgraphing.

TheAnalysergeneratesthreegraphs.ThefirstgraphshowstotalnetworktrafficbrokendownasTotal-ReadandTotal-Write.ThewritesareshownbelowtheX-Axis.

Notetheareachartcanbeeasilyconvertedtoalinechartifrequired.Simplyrightclickonthewhitespacewithinthechartarea,thenselectChartType>

Line>

OK.

如图所示，在16点左右的时间段en4网卡产生了大量的读流量

可从侧面印证numclient类型内存的大量使用。

NMON—page选项

ThissheethasthepagingstatisticsasrecordedbyNMON.

faultsthenumberofpagefaultspersecond.ThisisnotacountofpagefaultsthatgenerateI/O,becausesomepagefaultscanberesolvedwithoutI/O.

pginthetotalrate/secofpage-inoperationstobothpagingspaceandfilesystemsduringtheinterval.

pgoutthetotalrate/secofpage-outoperationstobothpagingspaceandfilesystemsduringtheinterval.

pgsintherate/secofpage-inoperationsfrompagingspaceduringtheinterval.Thisisthesameasthepivaluereportedbyvmstat.Ifpgsinisconsistentlyhigherthanpgsoutthismayindicatethrashing.

pgsouttherate/secofpage-outoperationstopagingspaceduringtheinterval.Thisisthesameasthepovaluereportedbyvmstat.

reclaimsfromNMON10onwardsthisfieldisthesameasthefrvaluereportedbyvmstatandrepresentsthenumberofpages/secfreedbythepage-replacementroutine.

scansthenumberofpages/secexaminedbythepagereplacementroutine.Thisisthesameasthesrvaluereportedbyvmstat.Pagereplacementisinitiatedwhenthenumberoffreepagesfallsbelowminfreeandstopswhenthenumberoffreepagesexceedsmaxfree.

cyclesthenumberoftimes/secthepagereplacementroutinehadtoscantheentirePageFrameTableinordertoreplenishthefreelist.Thisisthesameasthecyvaluereportedbyvmstatbutnotethatvmstatreportsthisnumberasanintegerwhereasnmonreportsitasarealnumber.

fsincalculatedbytheAnalyseraspgin-pgsinforgraphing

fsoutcalculatedbytheAnalyseraspgout-pgsoutforgraphing

sr/frcalculatedbytheAnalyserasscans/reclaimsforgraphing

NMON_Analyserproducestwographs.Thefirstshowspagingoperationsto/frompagingspace.Theidealherewouldbenomorethan5operations/secperpagespace（seetheBBBCsheetfordetails）.Thesecondgraphshowsthescan:

freerate.Memorymaybeover-committedwhenthisfigureis>

4althoughyoualsoneedtoexaminetheMEMandPAGEsheetsaswell.

在16点时间段，有基于文件系统的密集换出操作

在16点左右pgout和fsout的密集性换出操作，在整体的时间段faults值很高。

16点左右的pageio可以是由于在这个时段有大量的numclient内存动作，可以解释。

而faults动作暂时保留

NMON-topas选项

Thissheetisonlygeneratedifyouspecifythe-tflagontheNMONcommandline.Theoutputissimilartothatproducedusingthepsvcommand.Notethat,becauseofthelimitationofhavingonly65,000linesonasinglesheet,somedatamaybeomittedforverylargefilesandthismaymeanthatentirePIDsorevencommandsmaybemissingfromtheanalysis.

NotethatdataareonlypresentforprocessesthatconsumedasignificantamountofCPUduringaninterval.TheTOPsheetdoesnotrepresentacompleteviewofthesystem.

NMON_Analyserdoesthefollowing:

•reordersthecolumnsforeasierprocessing.

•SortsthedataonthesheetintoCOMMANDnameorder-usingTIMEasaminorsortkey.

•Createsatableattheendofthesheetsummarisingthedatabycommandnameandusedforgraphing.

Youcanseethedetailsectionbyscrollingtothetopofthesheet.Thesummarytableislargelyobscuredbythegraphsandsoyouwillneedtomove（ordelete）themforeasierviewing.

PIDinthedetailsectionthisistheprocessIDofaspecificinvocationofacommand.Inthesummarytablethisisthecommandname.

%CPUinthedetailsectionthisistheutilisationofasingleprocessor（ratherthanofthesystem）bythatPIDduringtheinterval.InthesummarytablethisistheaverageamountofCPUusedbyallinvocationsofthecommandduringthecollectionperiod.

%UsrinthedetailsectionthisistheaverageamountofUser-modeCPUusedbythatPIDduringtheinterval.

%SysinthedetailsectionthisistheaverageamountofKernel-modeCPUusedbythatPIDduringtheinterval.

Threadsthenumberof（software）threadsbeingusedbythiscommand.

Sizetheaverageamountofpagingspace（inKbytes）allocatedforthedatasection（privatesegment+sharedlibrarydatapages）foroneinvocationofthiscommand.ThisisthesameastheSIZEfigureonthepsvcommand.NotethatifSizeisgreaterthanResDataitmeanssomeworkingsegmentpagesarecurrentlypagedout.

ResTexttheaverageamountofrealmemory（inKbytes）usedforthecodesegmentsofoneinvocationofthiscommand.Notethatmultipleconcurrentinvocationswillnormallysharethesepages.

ResDatatheaverageamountofrealmemory（inKbytes）usedforthedatasegmentsofoneinvocationofthiscommand.AmethodofcalculatingrealmemoryusageforacommandisResText+（ResData*N）.

CharIOthisisthecountofbytes/secbeingpassedviathereadandwritesystemcalls.Thebulkofthisisreadingandwritingtodisksbutalsoincludesdatato/fromterminals,socketsandpipes.UsethistoworkoutwhichprocessesaredoingtheI/O.

%RAMthisisanindicationofwhatpercentageofrealmemorythiscommandisusing.Thisis（ResText+ResDa