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The Architecture Of Marco Cecconi @sklivvz sklivvz@stackoverflow.com

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

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#49 network for traffic* …and #7 in China! *source: Quantcast, Alexa much successful very traffic 谢谢 wow

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561,027,840 pageviews in the last 30 days* (~100% growth year over year) *source: Quantcast

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561,027,840 pageviews in the last 30 days* (~100% growth year over year) *source: Quantcast

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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, yo!

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BATCAVE

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BATCAVE DEV.SO

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BATCAVE DEV.SO META.SO

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BATCAVE DEV.SO META.SO

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BATCAVE DEV.SO META.SO NETWORK

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Move fast and break things

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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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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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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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馄饨！

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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*. It works. * You Ain’t Gonna Need It!

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

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Write libraries & open them to the world

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DEEP DIVES

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OPINIONATED HIRING

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REMOTE WORK

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

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$_='@mk=uf=radimdp1Z--&ewxuhhl';tr/=1m-za-l@&Z/ !a-zP@\n/&print; Marco Cecconi @sklivvz sklivvz@stackoverflow.com