Pedal to the Metal - Aftermath

Journey SoundCloud had to undergo when improving the iOS launch times.

Transcript

1. Pedal
   to the
   Metal
   Esteban Torres • Core Clients @ SoundCloud • @esttorhe
   

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2. Pedal
   to the
   Metal
   -
   AFTERMATH
   Esteban Torres • Core Clients @ SoundCloud • @esttorhe
   

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3. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
   

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4. !
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5. Sequel
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6. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
   

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7. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
   

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8. ⾠
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9. Context
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10. Planning
    @ SoundCloud
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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11. the bet
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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12. Improve
    iOS
    launch time
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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13. iOS branch
    Core Clients
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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14. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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15. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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16. Impossibility
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17. Check the code
    1. Grab start timestamp
    2. Grab end timestamp
    3. Diff
    4. Multiply by a 1000
    5. Send
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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18. Check the code
    1. Grab start timestamp
    2. Grab end timestamp
    3. Diff
    4. Multiply by a 1000
    5. Send
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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19. Over
    5 seconds
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20. 7,000,000
    milliseconds
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21. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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22. context
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23. App then
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24. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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25. App now
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26. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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27. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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28. more
    context
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29. Instruments
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30. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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31. 1. Startup Operations
    2. ViewController
    4. Profit??
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32. !
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33. Main thread
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34. !
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35. !
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36. How about that
    ViewController
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37. even more
    context
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38. Mirroring
    & you
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39. ⚡"
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40. What
    now !?
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41. Total pre-main time: 2.0 seconds (100.0%)
    dylib loading time: 355.67 milliseconds (17.0%)
    rebase/binding time: 1.3 seconds (63.5%)
    ObjC setup time: 186.10 milliseconds (8.9%)
    initializer time: 218.53 milliseconds (10.4%)
    slowest intializers :
    libSystem.dylib : 5.52 milliseconds (0.2%)
    : 51.01 milliseconds (2.4%)
    MediaServices : 57.60 milliseconds (2.7%)
    SoundCloud : 182.43 milliseconds (8.7%)
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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42. Enter
    Static Frameworks
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43. Total pre-main time: 563.45 milliseconds (100.0%)
    dylib loading time: 111.39 milliseconds (19.7%)
    rebase/binding time: 151.48 milliseconds (26.8%)
    ObjC setup time: 148.33 milliseconds (26.3%)
    initializer time: 152.08 milliseconds (26.9%)
    slowest intializers :
    libSystem.dylib : 3.37 milliseconds (0.5%)
    : 46.06 milliseconds (8.1%)
    MediaServices : 25.92 milliseconds (4.6%)
    SoundCloud : 148.34 milliseconds (26.3%)
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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44. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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45. Resources
    &
    Static Frameworks
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46. Including
    Frameworks
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47. Takeaways
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48. 1. Parallelize*
    * Also with care
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49. 2. Instruments is your friend
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50. 3. Static Frameworks*
    * Also with care
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51. 4. Assume no ill-intention
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52. Links
    · Automatic's blogpost about static
    frameworks 1
    · Keith Smiley's LD python script 2
    · CocoaPods 1.5.0 release notes 3
    3 http://blog.cocoapods.org/CocoaPods-1.5.0/
    2 https://github.com/keith/swi"-staticlibs
    1 https://blog.automatic.com/how-we-cut-our-ios-apps-launch-time-in-half-with-this-one-cool-trick-7aca2011e2ea
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53. Xiè xiè
    · Github / Twitter
    @esttorhe
    - Mastodon
    @esteban@mastodon.technology
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54. We are
    hiring
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55. Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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56. Xiè xiè
    Esteban Torres • Core Clients @ SoundCloud • @esttorhe
    

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