Stack Overflow - it's all about performance

Slides of the presentation given in November 2014 at Øredev

Transcript

1. Marco Cecconi @sklivvz http://sklivvz.com
2. ARCHITECTURE? WHAT THE HECK IS THAT?
5. Grew to 130 sites (+20%) Global site rank went from #56 to #44 (-12)
7. *source: Quantcast, Alexa #50-­‐ish  network  for  traffic*   (between imdb.com and t.co)
21. http://stackexchange.com/performance
22. Agile  
23. BAT!CAVE Code-build-test cycle running on home machine feature requests
24. BAT!CAVE DEV.SO Test on the real servers git push
25. BAT!CAVE DEV.SO META.SE 1-click deploy Users test on meta.stackexchange.com (“baking”) git push
26. BAT!CAVE DEV.SO META.SE 1-click deploy HALP! git revert git push
27. BAT!CAVE DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy It’s live! Tons of users use it…
28. BAT!CAVE DEV.SO NETWORK META.SE 1-click deploy git push 1-click deploy …and provide new feature requests
29. Move  fast  and  break  things*   * Not the home page or question page :-)
30. Move  fast  and  break  things*   * Not the home page or question page :-)
31. Abusing  caching  
35. Our  frienemy:   The  Garbage  Collector  
42. Cache abuse to help GC
45. Compiler abuse to help GC
50. IRepository<Order>  orderRepository  =            container.Resolve<IRepository<Order>>();     Order  order  =  orderRepository.Get(35); Ye olde dependency injection
52. IRepository<Order>  repository  =      new  ValidatingOrderRepository  (          new  SecurityRepository<Order>  (              new  LoggingRepository<Order>  (                  new  CachingRepository<Order>  (                      new  NHibernateRepository<Order>  ()                  )              )          )      );         Order  order  =  repository.Get(35);
53. Our  source  code  
60. YAGNI*   * You Ain’t Gonna Need It!
61. Libraries  and  open  source  
65. Wrap  code  in  libraries     and  open  source  it  
68. “SUPERHERO” CODING
70. TOOLS LEVEL: “NINJA”
71. •     Performance  is  a  feature   •     Always.  Be.  Shipping.   •     Use  your  circumstances.   •     Open  source  your  libraries   •     3  obscenely  big  monitors.     KEY TAKEAWAYS
73. Marco Cecconi @sklivvz http://sklivvz.com we are hiring new ninjas from anywhere in the world!