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
   

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2. ARCHITECTURE?
   WHAT THE HECK IS
   THAT?
   

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5. Grew to 130 sites (+20%)
   Global site rank went from #56 to #44 (-12)
   

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7. *source: Quantcast, Alexa
   #50-­‐ish  network  for  traffic*  
   (between imdb.com and t.co)
   

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21. http://stackexchange.com/performance
    

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22. Agile  
    

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23. BAT!CAVE
    Code-build-test cycle
    running on home machine
    feature requests
    

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

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

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

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

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

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

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31. Abusing  caching  
    

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35. Our  frienemy:  
    The  Garbage  Collector  
    

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42. Cache abuse to help GC
    

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45. Compiler abuse to help GC
    

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50. IRepository  orderRepository  =    
           container.Resolve>();  
     
    Order  order  =  orderRepository.Get(35);
    Ye olde dependency injection
    

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52. IRepository  repository  =  
       new  ValidatingOrderRepository  (  
           new  SecurityRepository  (  
               new  LoggingRepository  (  
                   new  CachingRepository  (  
                       new  NHibernateRepository  ()  
                   )  
               )  
           )  
       );  
         
    Order  order  =  repository.Get(35);
    

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53. Our  source  code  
    

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60. YAGNI*  
    * You Ain’t Gonna Need It!
    

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61. Libraries  and  open  source  
    

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65. Wrap  code  in  libraries    
    and  open  source  it  
    

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68. “SUPERHERO” CODING
    

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70. TOOLS LEVEL: “NINJA”
    

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

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73. Marco Cecconi
    @sklivvz
    http://sklivvz.com
    we are hiring new ninjas from anywhere in the world!
    

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