as400性能调整

《as400性能调整》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、AS400PerformanceTurning一、ConceptResponseTime1、DurationfrompressofbuttontothereleaseofanotherinputJobStates1、Activeexistsinmainstorageandprocessesworkrequestedbytheapplication2、Waitneedsaresourcethatisnotavailable3、Ineligiblethesystemisunabletoacceptmoreworkatthattime.WaitStates1、S

2、hortWaitholdsanavailableactivitylevelwhilewaitingforanactivitytooccur.(ex.Sndbrkmsg,write)Ajobcanremaininshortwaitforamaximumof2seconds.2、LongWaitjobleavesactivitylevel.(ex.Key/think,recordlock)3、ShortWaitExtendedshortwaittolongwaytransitionActivityLevel1、Restrictsthenumberofjobsi

3、nmainstorageatonetime2、AssuresthejobsystemresourceIneligibleQueue1、Notenoughresourcesareavailable,jobsbecomeineligible2、Itisplacedintheineligiblequeueuntilanactivitylevelisavailable.3、LongwaitstatejobnormallyFIFO4、Shortwaitextendedorlongwaitcausedbylockconflictitplacesinfrontofthe

4、queue.ProcessAccessGroupthevariablesanddataintheapplicationdonothavethesamevaluesforalljobsusingtheapplication.Theseportionsoftheapplicationandotheruniqueobjectsarepackagedasanobjectcalledaprocessaccessgroupandcanbepagedinoroutinoneoperations.TimeSlice1、Amountofprocessingunittimea

5、llowedforeachtransaction.2、Ifnojobsofequalorhigherpriorityareontheineligiblequeue,thejobisgivenanothertimeslice,remainsinmainstorage,andcontinuesthetransaction.2、Else,jobmovetoineligiblequeueortimesliceendpool(*BASE)Purge(*Yes)/(*No)—清除“性能工具”的一个作业属性，指定当作业进入一个漫长等待或者离开活动层时，是否将一作业标志为

6、可选来从主存储器移出至辅助存储器。1、Specifypurge(*yes)injobclassformostoftheenvironmentandsystemdeterminetheefficiencyofwritingofPAG2、Purge(*no)maycause–fewerwrites–reducediskuse–lessprocessingunittime–moremainstorageExpertCache(专家高速缓存)OS/400操作系统的存储管理功能的扩充，它允许单级存储体系结构充分利用主存储器（高速缓存）的容量。二、Thingswhic

7、haffectperformance1、CPU2、Disk3、Memory4、I/OController5、CommunicationsBandwidth6、BadApplications–ErrorHandling–RedundantCode–NoShareResources7、IrregularSystemActivities–Signoff–InteractiveComply–Opnqryf三、StepByStepTuning1、Setautomaticandsystemdefaults（AutomaticTuning）SetQPFRADJItcha

8、ngesthemachinepoolsize(QMCHPOOL)I