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The Architecture Of Marco Cecconi @sklivvz http://sklivvz.com

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Sizing up the problem

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*source: Quantcast, Alexa #55 network for traffic*

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#55 network for traffic* …and #13 in Poland!? *source: Quantcast, Alexa much successful very traffic dziękuję

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520,523,008 pageviews in the last 30 days* *source: Quantcast

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So, how big is our datacenter?

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web servers load balancers redis search database http(s) http rest http protobuf sql sql protobuf tag engine

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We are still scaling up!

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Our development cycle

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BATCAVE Code-build-test cycle running on home machine feature requests

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BATCAVE DEV.SO Test on the real servers git push

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BATCAVE DEV.SO META.SE 1-click deploy Users test on meta.stackexchange.com (“baking”) git push

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BATCAVE DEV.SO META.SE 1-click deploy HALP! git revert git push

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BATCAVE DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy It’s live! Tons of users use it…

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BATCAVE DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy …and provide new feature requests

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Move fast and break things* * Not the home page or question page :-)

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Move fast and break things* * Not the home page or question page :-)

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Caching

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Network Level Caches (CDN, etc.) Server Level Cache (HttpRuntime.Cache) Site Level Cache (Redis) SQL Server Database Cache (384 gigs of RAM!) Solid State Disk

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Too Many Allocations This is really the most basic thing that can go wrong. Too Many Pointers If you create a data structure that is a large mesh of pointers you'll have two problems. First, there will be a lot of object writes […] and, secondly, when it comes time to collect that data structure, you will make the garbage collector follow all those pointers and if necessary change them all as things move around. […] But if you create such a structure on a transitory basis, […], then you will pay the cost much more often. http://msdn.microsoft.com/en-us/library/ms973837.aspx#dotnetgcbasics_topic2

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Too Many Allocations This is really the most basic thing that can go wrong. Too Many Pointers If you create a data structure that is a large mesh of pointers you'll have two problems. First, there will be a lot of object writes […] and, secondly, when it comes time to collect that data structure, you will make the garbage collector follow all those pointers and if necessary change them all as things move around. […] But if you create such a structure on a transitory basis, […], then you will pay the cost much more often. http://msdn.microsoft.com/en-us/library/ms973837.aspx#dotnetgcbasics_topic2

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Abuse caching for GC performance

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Too Many Allocations This is really the most basic thing that can go wrong. Too Many Pointers If you create a data structure that is a large mesh of pointers you'll have two problems. First, there will be a lot of object writes […] and, secondly, when it comes time to collect that data structure, you will make the garbage collector follow all those pointers and if necessary change them all as things move around. […] But if you create such a structure on a transitory basis, […], then you will pay the cost much more often. http://msdn.microsoft.com/en-us/library/ms973837.aspx#dotnetgcbasics_topic2

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Too Many Allocations This is really the most basic thing that can go wrong. Too Many Pointers If you create a data structure that is a large mesh of pointers you'll have two problems. First, there will be a lot of object writes […] and, secondly, when it comes time to collect that data structure, you will make the garbage collector follow all those pointers and if necessary change them all as things move around. […] But if you create such a structure on a transitory basis, […], then you will pay the cost much more often. http://msdn.microsoft.com/en-us/library/ms973837.aspx#dotnetgcbasics_topic2

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IRepository orderRepository = container.Resolve>(); Order order = orderRepository.Get(35); This is what you think you are doing…

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…but if you think about it a bit more…

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...this is what you are actually doing! IRepository repository = new ValidatingOrderRepository ( new SecurityRepository ( new LoggingRepository ( new CachingRepository ( new NHibernateRepository () ) ) ) ); Order order = repository.Get(35);

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We don’t use dependency- injection or IoC containers

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Our source code

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Few projects :-)

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Few projects :-) Few lines of code :-)

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Few projects :-) Few lines of code :-) Eeek! very few tests :-S

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Few projects :-) Few lines of code :-) Awesome community to help :-D Eeek! very few tests :-S

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YAGNI* * You Ain’t Gonna Need It!

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Libraries and open source

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* Source http://bit.ly/1eSLr8Z

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Wrap code in libraries and open source it

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DEEP DIVES

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HIRE “A” PLAYERS

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TOOLS LEVEL: NINJA

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• Performance is a feature • Always. Be. Shipping. • Use your circumstances. • Open source your libraries • 3 obscenely big monitors. KEY TAKEAWAYS

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$_='Qgul=ar=ftq=pmk:=ftq=mooagzfmzf=puxqyym.=Guhqz=m=eqcgqzoq=ar= bduoqe,=IEzgyqdmnxq=ar=uzf=ruzp=ftq=rudef=N=ftmf=egy=fa=lqda,=itq dq=N=ue=m=bmdmy.=Ttq=xuef=yustf=zaf=nq=ruzufq=uz=eulq.=Sqzp=kagd= eaxgfuaz=fa=ewxuhhl&efmowahqdrxai.oay1';tr/=1m-za-l@&Z/ !a- zP@\n/&print; Marco Cecconi @sklivvz http://sklivvz.com