Loadrunner 结果分析向导1.docx

Loadrunner 结果分析向导1.docx

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Loadrunner结果分析向导1

LoadrunnerResultsAnalysis:

Contents

AnalysisSummaryPage3

RunningVusers5

RunningVusers5

HitsperSecond6

Throughput7

HitsperSecond-Throughput8

AverageTransactionResponseTime9

TransactionsperSecond（Passed/Failed）10

TotalTransactionsperSecond11

TransactionSummaryGraph12

TransactionPerformanceSummary13

TransactionResponseTime（UnderLoad）14

TransactionResponseTime（UnderLoad）14

TransactionResponseTime（Percentile）15

HTTPStatusCodeSummary16

HTTPResponsesperSecond17

RetriesperSecond18

Connections19

ConnectionsperSecond20

ErrorStatistics21

ErrorStatistics（byDescription）22

ErrorsperSecond23

ErrorsperSecond（byDescription）24

ErrorsperSecond（byDescription）24

ErrorsperSecond–RunningVusers25

Glossary26

AnalysisSummaryPage

TheAnalysisSummarypageisdividedintothreemainsections,thestatisticssummary,transactionsummary,andHTTPresponsessummary.Thestatisticssummarylistsoverallstatisticsofinterestinthescenario.

YoucancomparemaximumrunningVusersandthetotaldurationofthescenario（herethedurationis17:

08:

38–17:

54:

35,or46minutes）againstthroughputandhitsstatistics.BasedonVusersandduration,wastheperformanceoftheserver/applicationacceptablegiventhethroughputandhits/secondstatistics?

Youwillhavetohavesomeknowledgeofyourserver/databasecapabilitiesandconfigurationtomakethisdecision.

ThenextsectionoftheAnalysisSummaryistheTransactionSummary,containingstatisticsonindividualtransactions,theirresponsetimes（minimum,average,maximum,andstandarddeviation）.

The“90Percent”statisticindicatesthemaximumresponsetimeofninetypercentforthetransactionsinthatrow.Basedonthestatisticsabove,youcouldsaythat90%ofthe“A_MainPage_AFI…”transactionshadamaximumresponsetimeof94.845seconds.

Passedandfailedtransactionsarealsolistedinthissection.Transactionswiththe“Z_”prefixcontainthesumofallstatisticsfortransactionsusedinthatscript.Thetotalpassedtransactionsinthe“Z_”transactionwillbeatmostequaltothesingletransactionwiththefewestpasses,excludingvuser_init/endtransactions.Thisisbecausethe“Z_”transactionrecordsstatisticsfortheentirescriptflow,notjustasingletransaction.IfaVusersuccessfullyexecutesallthestepsinascript,fromstarttofinish,onlythenwillthenumberofpassesforthe“Z_”transactionincrease.However,iffailuresoccuratanypointinthescript,thenumberoffailuresforthetransactioninwhichthefailureoccurredwillincrease,andthenumberoffailuresforthe“Z_”transactionwillincreaseaswell.

Inthestatisticsabove,thetotalnumberofpassesinthe“Z_”transactionwas776,correspondingtothesingletransactionwiththefewestpasses,“E_ResultsDisplay…”,whereasthetotalnumberoffailuresfor“Z_”isthesumoffailuresfortheentiregroup.

ThefinalsectionintheAnalysisSummaryistheHTTPResponsesSummary,whichcontainsthetotalandpersecondstatisticsforallHTTPresponsesrecordedduringthetest.ThemostcommonresponsecodeswillbeHTTP200,indicatingsuccess.ForalistofallHTTPresponsecodesandtheirmeaningsseetheattacheddocumentintheglossary.

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RunningVusers

TheRunningVusersgraphdisplaysthenumberofvirtualuserscurrentlyexecutingscriptsinthetestscenario.AVuserperformsasequenceoftasksdefinedinatestscriptuntilthetesthascompleteditsduration,theVuserhasexecutedthescriptforarequirednumberofiterations,orthetestcontrollermanuallystopstheVuser.

Vuserswillusuallybeaddedtothescenarioinwhatiscalleda“gradualramp-up,”unlikethegraphabovewhereallVusersareaddedtothescenariosimultaneously.AfterthenumberofVusersreachesalevelsetinthestresstestplan,thatloadismaintainedforasetdurationbeforeagradualramp-downisinitiated.Theramp-downisusuallyfasterthantheramp-up,becauseremovingusersfromthescenariowillalmostneveradverselyaffectserverperformance.

Wheneveraproblemoccursduringatest,youshouldalwaysbeawareofthenumberofVuserscurrentlyrunninginthescenario.Thepurposeofastresstestistodiagnoseproblemsinanapplicationunderasimulatedload,soinanunstableapplicationitistypicaltoseeadecreaseinsomeperformancemeasurewhenthenumberofVuserspassesacertainlevel.AsuddennegativeshiftinperformanceusuallymeansthenumberofrunningVusershasincreased.

Thegraphabovefollowsatypicaltestschedule,witharamp-upof10usersperminutetoapeakloadof250users,thenthetestwasrunatpeakloadfor10minutes,andaramp-downofapproximately25usersperminute.

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HitsperSecond

TheHitsperSecondgraphshowsthenumberofhitsontheWebserverovertime.Thisgraphcandisplaytheentirescenario,orthelast60,180,600or3600seconds.YoucancomparethisgraphtotheTransactionResponseTimegraphtoseehowthenumberofhitsaffectstransactionperformance.

Anincreaseinhitspersecondindicatesanincreasedloadontheserver,socomparinghitspersecondwithtransactionresponsetimeandthroughputcangiveyouagoodideaofhowtheserverisperformingunderincreasedstress.Whenawebserverisfunctioningcorrectly,hitspersecondwilloftenmirrorthenumberofsuccessfulHTTPresponsecodes.Inthegraphabovethereisaspikeinhitspersecondaround25minutesintothetest.ThiscanbeexplainedbycomparinghitspersecondwiththeresultsofothergraphslikerunningVusers,throughput,andtransactionresponsetime.

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Throughput

TheThroughputgraphshowstheamountofdata,measuredinbytes,transmittedbytheWebserverduringeachsecondofthescenariorun.Throughputismeasuredinbytes/secondandrepresentstheamountofdatatransmittedbythewebserveroverthenetworkatanygiventime.Ideallythroughputshouldincreaseashitspersecondincreases,whichindicatesthatthereissufficientbandwidthtoprocessuserrequests.

YoucangaininformationonserverperformancebycomparingThroughputandHitsperSecond.Iftheserverisperformingasexpectedashitspersecondincrease,thenthroughputshouldalsoincrease.Thisisexpectedbehaviorbecauseanincreaseinhitswillrequiretheservertotransmitmoredatabacktotheusers.However,ifthenumberofhitspersecondincreasesandthroughputstaysconstantordecreases,thissignifiesthattheservercannotprocesstheincreaseinrequests（hitspersecond）,resultinginanincreaseintransactionresponsetime.

Thegraphaboveexhibitsageneraldecreaseinthroughputduringtheentiretest,withaslightbutnoticeabledecreasejustbefore25minutes,correspondingtothespikeinhitspersecondinthepreviousgraph.Tocomparethesestatisticsitisbesttooverlaythegraphs.

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HitsperSecond-Throughput

Thisgraphcontainsanoverlayofhitspersecondandthroughput.Wecanseeherethatthespikeinhitspersecondcoincideswithadecreaseinthroughputataround25minutes.Ifaserverisoperatingbelowpeakload,thenhitspersecondusuallymirrorsthroughput.Theresultinthegraphaboveismostlikelyduetoanincreaseinuserload,becausemoreuserswillcauseanincreaseinhitspersecond,andwhentheservercannolongerprocessthenumberofrequestscomingintherewillbeadecreaseinthroughput.

ReferringbacktheRunningVusersgraph,weknowthatthepeakloadof250userswasreachedjustbefore25minutes,resultinginanexpectedincreaseinhitspersecondandadecreaseinthroughput,indicatingthattheloadontheserverwasapproachingitsmaximum.Wecanguessfromthisgraphthattransactionresponsetimeandpossiblyerrorspersecondwillspikearound25minutesaswell.

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AverageTransactionResponseTime

TheAverageTransactionResponsetimegraphshowstheaverageresponsetimeofindividualtransactionsovertime.Responsetimeistheamountoftimebetweenaclientrequestandserverresponse.OftenresponsetimewillcorrespondtothenumberofVuserscurrentlyrunninginthetestscenario.

ThemostcommoncauseforanincreaseinresponsetimeisanincreaseinrunningVusers.ThisoccursbecauseasmoreVusersenterthetestscenariotheamountofworktheservermustperformincreases.Withanincreasedloadittakesmoretimefortheservertorespondtoanindividualrequest,soaverageresponsetimeincreasesaswell.

Inthegraphaboveweshouldexpectanincreaseinresponsetimecorrespondingtothechangeinbehaviorinothergraphsataround25minutes.Lookingattheresponsetimeforthe“Z_”transactionistheeasiestwaytoanalyzegeneralbehavior,andheretotalresponsetimeincreasedtoanaverageofaround110secondsby10minutesintothescenario.At10minutesthenumberofrunningVuserswas120,soitislikelythattheserverwasoperatingathighcapacityfromthistimeonwards.

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TransactionsperSecond（Passed/Failed）

TheTransactionsperSecondgraphshowsthenumberofsuccessful/unsuccessfultransactionsovertime.AtransactionrepresentsasinglesteporgroupofstepsexecutedbyaVuser.Forexample,theprocessofenteringandsubmittinglogininformationonawebpagecouldbegroupedasasingletransaction.

ThenumberoftransactionspersecondshouldcorrespondtothenumberofVusersrunninginthetestscenarioatagiventime,andtypicallyasmoreVusersareaddedtothescenariothenumberoftransactionspersecondwillincrease.IfthenumberoftransactionsperseconddecreaseswithanincreaseinVusers,thenthereisprobablysomepro