如何建设高性能网站

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1、HighperformanceWebSitesrichardchang不知大家有没有看过这个ppt以及这个架构图Yahoo’sCasePerformanceresearchand14rulesExceptionalPerformancestartedin2004quantifyandimprovetheperformanceofallYahoo!productsworldwidecenterofexpertisebuildtools,analyzedatagather,research,andevangelizebestpracti

2、cesScopeperformancebreaksintotwocategoriesresponsetimeefficiencycurrentfocusisresponsetimeofwebproductsTheImportanceofFront-EndPerformancepercentageoftimespentonthefront-endBack-endvs.Front-endThePerformanceGoldenRule80-90%oftheend-userresponsetimeisspentonthefront-end

3、.Startthere.GreaterpotentialforimprovementSimplerProventoworkPerformanceResearchhttp://yuiblog.com/blog/2006/11/28/performance-research-part-1/80/20PerformanceRuleVilfredoPareto:80%ofconsequencescomefrom20%ofcausesFocusonthe20%thataffects80%oftheend-userresponsetime.St

4、artatthefront-end.1userrequestswww.yahoo.com2userrequestsotherwebpages3userre-requestswww.yahoo.comEmptyvs.FullCache1userrequestswww.yahoo.com2userrequestsotherwebpages3userre-requestswww.yahoo.comEmptyvs.FullCachewithanemptycache1userrequestswww.yahoo.com2userrequests

5、otherwebpages3userre-requestswww.yahoo.comEmptyvs.FullCacheEmptyvs.FullCacheExpiresheader1userrequestswww.yahoo.com2userrequestsotherwebpages3userre-requestswww.yahoo.comwithafullcacheEmptyvs.FullCacheemptycache2.4secondsfullcache0.9seconds83%fewerbytes90%fewerHTTPrequ

6、estsHowmuchdoesthisbenefitourusers?Itdependsonhowmanyusershavecomponentsincache.Whatpercentageofusersviewapagewithanemptycache*?*“Emptycache”meansthebrowserhastorequestthecomponentsinsteadofpullingthemfromthebrowserdiskcache.Whatpercentageofpageviewsaredonewithanempty

7、cache*?http://yuiblog.com/blog/2007/01/04/performance-research-part-2/Addanewimagetoyourpagewiththefollowingresponseheaders:Expires:Thu,15Apr200420:00:00GMTLast-Modified:Wed,28Sep200623:49:57GMT}1pxBrowserCacheExperimentBro

8、wserCacheExperimentRequestsfromthebrowserwillhaveoneoftheseresponsestatuscodes:200–Thebrowserdoesnothavetheimageinit