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INFOBrief Dell  Your next ® SAP NetWeaver Portalbased Solution?
Results OnApril7,2006,SAPAGcertifiedtheresultsofatwotierSAP® EmployeeSelfServicePortal(EPESS)StandardApplicationBenchmarkonaDellPowerEdge6850serverreachingatotalof19411 SAPEPESSBenchmarkusers .Delldemonstratesitstechnologyleadershipindeliveringthehighest2 twotierSAPEPESSBenchmarkresultasofMay4,2006.ThepurposeofthisINFOBriefistoshareDellʹslessonslearnedinsettingupastable,longlastingSAPNetWeaver®Portalbasedsolution.MainstepsthatmayassistinincreasingperformanceandthushelptolowerTCOcanbefoundinthisdocument.
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The Challenge and the Configuration U Astheenterpriseservicesarchitecture(ESA)gainsmomentum,moreandmorecustomerstakethechancetointegratetheSAP®NetWeaverPortalasacollaborationplatformintotheirSAPNetWeaverplatformbasedlandscape.BecausetheJavabasedportalisquitedifferentfromABAPbasedSAP®applicationssuchasSalesandDistributionorMaterialsManagement,researchintooptimalconfigurationsettingswasneeded.ThebenchmarkenvironmentusedisbasedonNovellʹsSUSELinuxEnterpriseServer.ManycustomerswithlongstandingUNIX®backgroundsandinvestmentsarelookingtoLinuxasamorecosteffectivealternative.BenchmarkdetailsU Thebenchmark’sconfigurationandresultsare:
Hardware
Application Database Operating System SAP EPESS Benchmark users
Number of Top Level Navigation steps/hour
Dell Product Group/Enterprise
Dell™PowerEdge™68504processors/8cores/16threadsIntelXeonMP3.0Ghz32 GB RAM SAP NetWeaver Portal 6.0 MaxDB 7.5 3 Novell® SUSE™ Linux Enterprise Server 9 EM64T P P
1,941 583 000
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What does it mean for your business? TheSAPEPESSStandardApplicationBenchmarksimulatesreallifeusersdoingtypicalemployeeactivitieslikerecordingtheirworkingtimeorlookingattheirbankinformation.Thebackendinfluenceontheperformancehasbeenomitted.Thegoalistoreachanaverageresponsetimeoflessthantwosecondswithamaximumusernumber.Withthisusernumberinmind,youcancomparedifferenthardwareplatformsfortheneedsofyourbusinessplatform.Performance Parameters TherearemanyconfigurationparametersfortheSAP®NetWeaverPortalthatcanbefinetunedforperformance.Thechallengingtaskistofindthosethatreallymakeadifferencewithregardstobusinessneeds.Forexample,withUNIX/Linuxsystems,thereisoftenthenotionthatrunningagraphicinterfacecouldadverselyaffecttheoverallsystemperformance,soyoucouldgainperformancebydisablingit.Toverifythis,DellranthebenchmarkoncewithafullyfeaturedKDEdesktopenvironmentrunning,andoncewithout.TherunwiththeKDEgraphicinterfaceshowednosignificantchangesintheresponsetime.Thisshowsthatprovidedtheabsenceofresourcebottleneckstheactivationofasystemʹsdesktopinterfacewouldnottypicallyinterferewithitsportalsfunction.Thefollowingaresettingsthatthisbenchmarkshowedtobeofsignificance.BIOSSettingsThehardwareprefetcheroptimizesperformanceforsequentialmemoryaccess.Wefoundanincreaseinperformanceifitisdisabled,whilethePowerEdge6850’sdefaultsettingshaveitenabled.Toturnitoff,dothefollowing:Whenbootingtheserver,entertheDellsystemBIOSbypressingF2InthesystemBIOS,choseCPUinformation>SequentialMemoryAccessSetthisoptionto“disabled”WefoundthattheprefetcherhadthefollowingperformanceimpactontheSAPNetWeaverPortalbasedsystem:
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9
8 7 6
5 4
3 2 1
0
Prefetcher's influence
response time
OFF ON state Figure 1 Performance impact of thePrefetchersetting (lower is better) Figure1showsthatswitchingofftheprefetcherdecreased,inthisparticularexample,thesystemʹsansweringtimefrom8.47secondsto2.16seconds,whileallotherparametersremainedunchanged.
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SoftwareSettingsThesoftwaresettingsweredonefortheSAPJ2EEengineusingSAPʹsconfigtool.Itisagraphicconfigurationinterface:
Figure 2 Screenshot of theConfigtool Inthisexample,wefindtheJ2EEenginecontainingeightservernodes(serverIDnumbers34807503480757).Theseventhnodehasbeenopened,itsexecutiontagisenabled,anditsheapconsumptioninthisexampleis2,500MB.
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ServerNodesU OneofthedecidingperformancefactorsisthenumberofservernodeswithintheSAPJ2EEengine.TheoptimalnumberiscontingentonavailablememoryandCPUresources.ForaDell™PowerEdge6850withdualcoreprocessorsand32GBRAM,wefoundsevenservernodesdeliveroptimalperformancewhilethesystemʹsresponsetimesdifferasdescribedinthefollowingdiagram.Server Nodes' influence
2.25
2 1.75 1.5
1.25 1
0.75 0.5 0.25
response time
0 6 7 8 server nodes Figure 3 Performance impact of the server nodes' count(lower is better)Thediagraminfigurethreeshowstheminimumresponsetimeoftheexamplesystematsevenservernodeswith1.92seconds,comparedto2.16secondsforsixandeightservernodes.Foreachcolumn,thethreadcountforallservernodesremainedunchanged.
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ThreadCountU Theapplicationthreadcountturnedouttoinfluencetheperformancesignificantly.Tomanipulatethethreadcount,usetheconfigtooltosetthevaluesforMinThreadCount,InitialThreadCountandMaxThreadCountunderclusterdata>Globalserverconfiguration>managers>ApplicationThreadManagerThreads' influence
2.25
2 1.75 1.5
1.25 1
0.75 0.5 0.25
response time
0 30 40 50 threads Figure 4 Performance impact of the threads' number(lower is better)Thediagraminfigurefourshowstheminimumresponsetimeoftheexamplesystemat40threadsperservernode.Theresponsetimeis1.92secondshere,comparedto1.94at30and2.02at50threadspernode.Allotherparametersremainedunchanged.Bottom Line U TuningtherightparametersinanSAP®NetWeaverPortalbasedsystemdeliverssignificantperformanceincreases.Whileinourteststhehardware(BIOS)settingshaveyieldedthemostimportanteffect,thesoftwareparametersplayanimportantroleinfinetuningthesystem,especiallywhenmappingthesoftwareconfigurationtothehardwareresourcesavailable.DistinctCPUormemoryresourcesneedadaptedsettingsinordertobeoptimallyused.Findingtherightfithelpsyourbusinessplatformtoruninamorestablemanner,deliveringthehighestpossibleperformanceandthusprovidingamoreoptimalreturnoninvestment.
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1 TheDellresultonthetwotierSAPEmployeeSelfServicePortal(EPESS)StandardP P ApplicationBenchmarkwascertifiedonApril7,2006,certificationnumber2006017,andfullycomplieswiththeguidelinesissuedbytheSAPBenchmarkCouncil.MoreinformationonSAPStandardApplicationBenchmarksisavailableathttp://www.sap.com/benchmark.2 ForfulldetailsoftheSAPEPESSStandardApplicationBenchmarkpleaserefertoP P http://www.sap.com/solutions/benchmark/epess.epx.TH TH 3 Intheinterestofcustomerchoice,DellsupportstheLinuxdistributionsofbothNovell®P P SUSE™LinuxEnterpriseServer,aswellasRedHat®EnterpriseLinuxforallSAPimplementations.©2006DellInc.Dell,PowerEdge,andtheDelllogoaretrademarksofDellInc.Delldisclaimsanyproprietaryinterestinthemarksandnamesofothers.
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