High Performance Rails

Talked at RubyKaigi 2013

http://rubykaigi.org/2013/talk/S76

Long edition also available at https://speakerdeck.com/mirakui/high-performance-rails-long-edition

Recorded talk (Japanese) http://www.ustream.tv/recorded/33559705

Transcript

1. )JHI
   1FSGPSNBODF
   3BJMT
   Issei Naruta
   RubyKaigi 2013
   (long edition)
   

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2. *TTFJ/BSVUB
   VP of DevOps at COOKPAD Inc.
   @mirakui
   Image delivering &&
   site performance improvement
   

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3. “Speed up Rails”
   

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4. View Slide

5. COOKPAD is Japan’s
   top recipe site
   allowing visitors to
   upload and search
   through original, user-
   created recipes.
   20 million UU/month
   1.38 million recipes
   *Jan 2013
   

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6. $00,1"%
   • AWS
   • Rails 3.2
   • Ruby 2.0.0
   

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7. 4J[FPG
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   • 1003 models
   • 236 controllers
   • 2871 view templates
   • 1978 lines in routes.rb
   • 3383 assets in manifest.yml
   *26 May 2013
   

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8. NT
   

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9. 8IBUJTUIF
   lSFTQPOTFUJNFz
   

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10. Started GET "/articles/1" ...
    :
    Article Load (0.1ms) SELECT articles.* FROM ...
    :
    Rendered articles/show.html.erb within layouts/application (0.7ms)
    Completed 200 OK in 100ms (Views: 70.1ms | ActiveRecord: 10.0ms)
    3FTQPOTFUJNFJO
    SBJMTMPH
    

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11. 3FTQPOTFUJNFJO
    SFTQPOTFIFBEFS
    X-Runtime: 0.123456
    

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12. routing
    before_filter
    after_filter
    rendering
    action
    Rails
    Rack
    "Completed" time
    X-Runtime
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    )5513FTQPOTF
    

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13. *T3BJMT4MPX
    

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14. http://www.techempower.com/benchmarks/
    Rails
    (slow)
    Servlet
    (fast)
    8FC'SBNFXPSL#FODINBSLT
    

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15. .BKPSQSFNJTFPG
    IJHIQFSGPSNBODF
    3BJMTBQQT
    

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16. %PO`UQSPDFTT
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    JGQPTTJCMF
    

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17. /HJOY
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18. /HJOY
    6OJDPSO
    serve
    static files
    

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19. /HJOY
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    QBHFDBDIJOH
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20. #SPXTFSTJEF
    $BDIJOH
    

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21. #SPXTFSTJEF
    $BDIJOH
    

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22. 6TJOHCSPXTFSTJEFDBDIJOH
    

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23. /FWFSVTFCSPXTFSTJEFDBDIJOH
    

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24. $POEJUJPOBM(&5
    

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25. 1st request
    2nd request
    

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26. View Slide

27. GSFTI@XIFO
    • Set ETag and Last-Modified to
    response header
    • Return “304 Not Modified” if;
    •ETag == If-None-Match
    • Last-Modified <= If-Modified-Since
    • Skip rendering if 304 (fast!)
    

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28. is equal to
    

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29. FUBH\^
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    ETag is made of
    

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30. 3VCZ7FSTJPO
    

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31. 0VSSVCZIJTUPSZ
    • Sep 2012
    • REE (Ruby Enterprise Edition) 1.8.7
    • Feb 2013
    • MRI 1.9.3
    • Apr 2013
    • MRI 2.0.0
    

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32. 8IBU`T3&&
    • MRI 1.8.7 + “MBARI patch”
    • “100% compatible with MRI 1.8.7”
    • Copy-on-Write Friendly GC
    • tcmalloc
    

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33. REE 1.8.7 MRI 1.9.3 MRI 2.0.0
    3FTQPOTFUJNF
    CZSVCZWFSTJPOT
    -100ms
    -20ms
    

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34. #FODINBSLT
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    3VCZ
    3BJMTSD
    

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35. 1FSGPSNBODF
    #PUUMFOFDLT
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36. 0% 20% 40% 60% 80% 100%
    SQL Ruby
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    SFDJQFTIPX DPPLQBEDPN
    
    

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37. 4MPXTUVGG
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    • ActiveRecord objects creation
    • Resolving routes
    

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38. "DUJWF3FDPSE`T
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    "SUJDMF-PBE NT
    4&-&$5ABSUJDMFTA'30.
    

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39. "DUJWF3FDPSE`T
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    4&-&$5ABSUJDMFTA'30.
    
    The query is fast enough but
    creating 100 AR objects is slow
    

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40. 3FTPMWJOHSPVUFT
    • Fat routes slow down url_for
    • e.g. link_to helper
    

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41. 4J[FPG
    0VS3BJMT"QQ
    • 1003 models
    • 236 controllers
    • 2871 view templates
    • 1978 lines in routes.rb
    • 3383 assets in manifest.yml
    *26 May 2013
    

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42. MJOL@UPIFMMP IFMMP@JOEFY@VSM
    MJOL@UPbIFMMP` DPOUSPMMFSbIFMMP` BDUJPObJOEFY`
    8IJDIJTGBTUFS
    

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43. DPOpHSPVUFTSC
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44. MJOL@UPIFMMP IFMMP@JOEFY@VSM
    NT
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    NT
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45. 4MPXSBDL
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    • Caches response with Rails.cache
    • Default in Rails 3.2
    • Not default in Rails 4
    

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46. $BDIJOH
    

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47. 'SBHNFOU$BDIF
    

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48. DBDIFEP
    USFOE@LFZXPSET
    FOE
    

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49. DBDIFEP
    controller
    action
    cache digest (Rails4)
    views/localhost:3000/hello/cache_test/3e9258928c27f4ffc5135520c3a976c5
    %FGBVMUDBDIFLFZ
    

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50. DBDIFGSBHNFOUbLFZ`EP
    views/localhost:3000/hello/cache_test?fragment=key1
    /3e9258928c27f4ffc5135520c3a976c5
    fragment key
    'SBHNFOUDBDIFLFZ
    

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51. DBDIFbLFZ`EP
    views/key1/116839051556390fb4d5b25362cfe6eb
    global key
    (MPCBMDBDIFLFZ
    

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52. DBDIF!BSUJDMFEP
    table name
    @article.cache_key
    (id, updated_at)
    views/articles/1-20130527190532189241000
    /116839051556390fb4d5b25362cfe6eb
    "3DBDIFLFZ
    

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53. $BDIF%JHFTUT
    BLBl3VTTJBOEPMMDBDIJOHz
    
    

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54. projects documents comments
    1 * 1 *
    has_many :documents has_many :comments
    belongs_to :document
    id
    updated_at
    id
    project_id
    updated_at
    id
    document_id
    updated_at
    belongs_to :documents
    

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55. projects/show.html.erb
    _document.html.erb
    _comment.html.erb
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    DBDIFDPNNFOUEP
    

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56. comment.update!
    

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57. projects/show.html.erb
    _document.html.erb
    _comment.html.erb
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    still old...
    3BJMT
    ʜʜ
    LFZOPUDIBOHFE
    ʜʜ
    

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58. projects documents comments
    1 * 1 *
    has_many :documents has_many :comments
    belongs_to :document,
    touch: true
    id
    updated_at
    id
    project_id
    updated_at
    id
    document_id
    updated_at
    belongs_to :documents,
    touch: true
    update
    

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59. projects/show.html.erb
    _document.html.erb
    _comment.html.erb
    DBDIFQSPKFDUEP
    DBDIFEPDVNFOUEP
    DBDIFDPNNFOUEP
    updated
    3BJMT8BZ
    LFZDIBOHFE
    LFZDIFOHFE
    LFZDIBOHFE
    

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60. projects/show.html.erb
    _document.html.erb
    _comment.html.erb
    DBDIFQSPKFDUEP
    DBDIFEPDVNFOUEP
    DBDIFDPNNFOUEP
    updated
    3BJMT8BZ
    LFZDIBOHFE
    .PEJGZpMF
    LFZDIBOHFE
    

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61. made of [id, updated_at]
    MD5 of the template file itself
    and all of its dependencies
    views/documents/1-20130527190532189241000
    /116839051556390fb4d5b25362cfe6eb
    

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62. "DUJPO$BDIF
    

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63. caches_action :show,
    if: -> { !current_user.staff? },
    cache_path: -> { custom_cache_path },
    expires_in: 1.hour
    

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