Using Skylight to Solve Real-World Performance Problems

Transcript

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3. OSSATHON
   Eating our own dogfood.
   

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5. An Open Source Event Manager tailored to

   Free and Open Source Software conferences.
   openSUSE/osem
   

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9. A
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   AA
   BB CC DD
   

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10. A
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    AA
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    DD
    Not a real response time distribution.
    

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11. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z AA BB CC DD
    Average!
    Not a real response time distribution.
    

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12. A
    B
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    AA
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    95% requests
    Not a real response time distribution.
    

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13. A
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    AA
    BB CC DD
    

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14. A
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    AA
    BB CC DD
    Average…?
    

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15. A
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    AA
    BB CC DD
    50% requests
    

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16. A
    B
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    K
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    AA
    BB CC DD
    95% requests
    

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19. class PostsController < ApplicationController
    def index
    @posts = Post.limit(10)
    end
    end
    

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20. class Post < ActiveRecord::Base
    belongs_to :author
    end
    

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21. <% @posts.each do |post| %>
    
    By <%= post.author.name %>
    
    <% end %>
    

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22. <% @posts.each do |post| %>
    
    By <%= post.author.name %>
    
    <% end %>
    @posts
    post.author
    SELECT * FROM authors WHERE id = 13;
    SELECT * FROM authors WHERE id = 15;
    SELECT * FROM authors WHERE id = 21;
    SELECT * FROM authors WHERE id = 33;
    SELECT * FROM authors WHERE id = 37;
    SELECT * FROM posts LIMIT 10;
    

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23. class PostsController < ApplicationController
    def index
    @posts = Post.limit(10)
    end
    end
    @posts = Post.limit(10).includes(:author)
    SELECT * FROM posts LIMIT 10;
    SELECT * FROM authors WHERE id IN
    (13, 15, 21, 33, 37, 42, 46, 47, 53, 55);
    

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25. An open source community and curriculum
    for learning web development.
    theodinproject/theodinproject
    

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27. PERCENTAGE = COURSES COMPLETED ⨉ 100%
    LESSONS AVAILABLE
    LESSONS COMPLETED
    

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28. PERCENTAGE = COURSES COMPLETED ⨉ 100%
    LESSONS AVAILABLE
    LESSONS COMPLETED
    SELECT * FROM lessons WHERE course_id = 1;
    

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29. PERCENTAGE = COURSES COMPLETED ⨉ 100%
    LESSONS AVAILABLE
    LESSONS COMPLETED
    SELECT * FROM lessons WHERE course_id = 1;
    SELECT * FROM lesson_completions WHERE student_id = 13;
    

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30. SELECT * FROM lesson_completions WHERE student_id = 13;
    create_table "lesson_completions" do |t|
    t.integer "lesson_id"
    t.integer "student_id"
    t.t.timestamps
    t.index ["lesson_id", "student_id"], unique: true, using: :btree
    end
    PERCENTAGE = COURSES COMPLETED ⨉ 100%
    LESSONS AVAILABLE
    LESSONS COMPLETED
    SELECT * FROM lessons WHERE course_id = 1;
    

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31. SELECT * FROM lesson_completions WHERE student_id = 13;
    create_table "lesson_completions" do |t|
    t.integer "lesson_id"
    t.integer "student_id"
    t.t.timestamps
    t.index ["lesson_id", "student_id"], unique: true, using: :btree
    end
    

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32. NOPE.
    

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33. NOPE.
    Sometimes?
    

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34. LessonCompletion Load (57.2ms) SELECT "lesson_completions".* FROM ...
    => EXPLAIN for: SELECT "lesson_completions".* FROM "lesson_completions" ...
    -----------------------------------------------------------------------
    Seq Scan on lesson_completions (cost=0.00..4063.50 rows=49 width=28)
    Filter: (student_id = 3074)
    (2 rows)
    

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35. LessonCompletion Load (57.2ms) SELECT "lesson_completions".* FROM ...
    => EXPLAIN for: SELECT "lesson_completions".* FROM "lesson_completions" ...
    -----------------------------------------------------------------------
    Seq Scan on lesson_completions (cost=0.00..4063.50 rows=49 width=28)
    Filter: (student_id = 3074)
    (2 rows)
    57.2ms
    Seq Scan on lesson_completions
    

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36. LessonCompletion Load (9.8ms) SELECT "lesson_completions".* FROM ...
    => EXPLAIN for: SELECT "lesson_completions".* FROM "lesson_completions" ...
    -----------------------------------------------------------------------
    Index Scan using index_lesson_completions_on_lesson_id_and_student_id ...
    Filter: (student_id = 3074)
    (2 rows)
    9.8ms
    

    Index Scan using index_lesson_completions_on_lesson_id_and_student_id

    

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37. LessonCompletion Load (1.6ms) SELECT "lesson_completions".* FROM ...
    => EXPLAIN for: SELECT "lesson_completions".* FROM "lesson_completions" ...
    -----------------------------------------------------------------------
    Index Scan using index_lesson_completions_on_student_id on ...
    Filter: (student_id = 3074)
    (2 rows)
    1.6ms
    Index Scan using index_lesson_completions_on_student_id
    

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38. SELECT * FROM lesson_completions WHERE ...
    lesson_id = ? student_id = ?
    lesson_id = ?
    AND

    student_id = ?
    student_id = ?
    AND

    lesson_id = ?
    Dedicated Indexes
    (lesson_id)
    (student_id)
    Compound Index
    (lesson_id, student_id)
    Compound Index
    (student_id, lesson_id)
    ! ! ! !
    ! ! !
    "
    " ! ! !
    

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42. Help out your favorite open source projects and
    become a better developer while doing it.
    codetriage/codetriage
    

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50. <% @repos.each do |repo| %>
    <% cache repo do %>
    
    <% end %>
    <% end %>
    

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51. <% @repos.each do |repo| %>
    <% cache repo do %>
    
    <% end %>
    <% end %>
    <% cache repo do %>
    READ views/repos/1894-20180413141703167092/b20
    READ views/repos/1245-20180413141214948480/b20
    READ views/repos/3353-20180413142449772302/b20
    READ views/repos/987-20180413140921805080/b201
    READ views/repos/1240-20180413141121053193/b20
    READ views/repos/2193-20180413141853545411/b20
    READ views/repos/1055-20180413141006040871/b20
    READ views/repos/1332-20180413141232839666/b20
    

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52. <%= render partial: 'repo', collection: @repos, cached: true %>
    READ MULTI views/repos/1894-2018041
    views/repos/1245-2018041
    views/repos/3353-2018041
    views/repos/987-20180413
    views/repos/1240-2018041
    views/repos/2193-2018041
    views/repos/1055-2018041
    views/repos/1332-2018041
    views/repos/1258-2018041
    

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54. Cache write: views/repos/1901-20180413141634501842/b201d971de1a77b9f19a62934e479a96
    Cache write: views/repos/863-20180413140900779427/b201d971de1a77b9f19a62934e479a96
    Cache write: views/repos/386-20180413140542430556/b201d971de1a77b9f19a62934e479a96
    Cache write: views/repos/1996-20180413141654477686/b201d971de1a77b9f19a62934e479a96
    Cache write: views/repos/528-20180413140609506027/b201d971de1a77b9f19a62934e479a96
    Cache write: views/repos/3072-20180413142336550445/b201d971de1a77b9f19a62934e479a96
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    Rendered collection of repos/_repo.html.slim [23 / 50 cache hits] (135.1ms)
    Rendered pages/_repos_with_pagination.html.slim (148.7ms)
    Rendered pages/index.html.slim within layouts/application (166.9ms)
    Rendered application/_head.html.slim (1.0ms)
    Rendered application/_flashes.html.slim (0.2ms)
    Rendered application/_nav.html.slim (1.0ms)
    Rendered application/_footer.html.slim (1.0ms)
    Rendered layouts/application.html.slim (172.2ms)
    Completed 200 OK in 183ms (Views: 166.3ms | ActiveRecord: 7.9ms)
    Rendered collection of repos/_repo.html.slim [23 / 50 cache hits] (135.1ms)
    

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55. 100 MB
    

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58. STAT items:0:chunk_size 64
    STAT items:0:evicted 0
    STAT items:0:evicted_nonzero 0
    STAT items:0:number 0
    STAT items:0:outofmemory 0
    STAT items:1:chunk_size 128
    STAT items:1:evicted 94
    STAT items:1:evicted_nonzero 4
    STAT items:1:number 18
    STAT items:1:outofmemory 5
    STAT items:2:chunk_size 256
    STAT items:2:evicted 106659
    STAT items:2:evicted_nonzero 0
    STAT items:2:number 9040
    STAT items:2:outofmemory 0
    STAT items:3:chunk_size 512
    STAT items:3:evicted 5356
    STAT items:3:evicted_nonzero 981
    STAT items:3:number 2
    STAT items:3:outofmemory 57855
    STAT items:4:chunk_size 1024
    STAT items:4:evicted 1880488
    STAT items:4:evicted_nonzero 0
    STAT items:4:number 4982
    STAT items:4:outofmemory 85445
    STAT items:5:chunk_size 2048
    

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59. STAT items:1:number 18
    STAT items:1:outofmemory 5
    STAT items:2:chunk_size 256
    STAT items:2:evicted 106659
    STAT items:2:evicted_nonzero 0
    STAT items:2:number 9040
    STAT items:2:outofmemory 0
    STAT items:3:chunk_size 512
    STAT items:3:evicted 5356
    STAT items:3:evicted_nonzero 981
    STAT items:3:number 2
    STAT items:3:outofmemory 57855
    STAT items:4:chunk_size 1024
    STAT items:4:evicted 1880488
    STAT items:4:evicted_nonzero 0
    STAT items:4:number 4982
    STAT items:4:outofmemory 85445
    STAT items:5:chunk_size 2048
    STAT items:5:evicted 67687
    STAT items:5:evicted_nonzero 0
    STAT items:5:number 5605
    STAT items:5:outofmemory 0
    STAT items:6:chunk_size 4096
    STAT items:6:evicted 135319
    STAT items:6:evicted_nonzero 0
    STAT items:6:number 11126
    STAT items:6:outofmemory 0
    STAT items:4:chunk_size 1024
    STAT items:4:evicted 1880488
    STAT items:4:evicted_nonzero 0
    STAT items:4:number 4982
    STAT items:4:outofmemory 85445
    1 KB
    4982 items
    

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60. STAT items:1:number 18
    STAT items:1:outofmemory 5
    STAT items:2:chunk_size 256
    STAT items:2:evicted 106659
    STAT items:2:evicted_nonzero 0
    STAT items:2:number 9040
    STAT items:2:outofmemory 0
    STAT items:3:chunk_size 512
    STAT items:3:evicted 5356
    STAT items:3:evicted_nonzero 981
    STAT items:3:number 2
    STAT items:3:outofmemory 57855
    STAT items:4:chunk_size 1024
    STAT items:4:evicted 1880488
    STAT items:4:evicted_nonzero 0
    STAT items:4:number 4982
    STAT items:4:outofmemory 85445
    STAT items:5:chunk_size 2048
    STAT items:5:evicted 67687
    STAT items:5:evicted_nonzero 0
    STAT items:5:number 5605
    STAT items:5:outofmemory 0
    STAT items:6:chunk_size 4096
    STAT items:6:evicted 135319
    STAT items:6:evicted_nonzero 0
    STAT items:6:number 11126
    STAT items:6:outofmemory 0
    STAT items:4:chunk_size 1024
    STAT items:4:evicted 1880488
    STAT items:4:evicted_nonzero 0
    STAT items:4:number 4982
    STAT items:4:outofmemory 85445
    5 MB
    

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    50 cards
    

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63. STAT items:1:number 18
    STAT items:1:outofmemory 5
    STAT items:2:chunk_size 256
    STAT items:2:evicted 106659
    STAT items:2:evicted_nonzero 0
    STAT items:2:number 9040
    STAT items:2:outofmemory 0
    STAT items:3:chunk_size 512
    STAT items:3:evicted 5356
    STAT items:3:evicted_nonzero 981
    STAT items:3:number 2
    STAT items:3:outofmemory 57855
    STAT items:4:chunk_size 1024
    STAT items:4:evicted 1880488
    STAT items:4:evicted_nonzero 0
    STAT items:4:number 4982
    STAT items:4:outofmemory 85445
    STAT items:5:chunk_size 2048
    STAT items:5:evicted 67687
    STAT items:5:evicted_nonzero 0
    STAT items:5:number 5605
    STAT items:5:outofmemory 0
    STAT items:6:chunk_size 4096
    STAT items:6:evicted 135319
    STAT items:6:evicted_nonzero 0
    STAT items:6:number 11126
    STAT items:6:outofmemory 0
    STAT items:4:chunk_size 1024
    STAT items:4:evicted 1880488
    STAT items:4:evicted_nonzero 0
    STAT items:4:number 4982
    STAT items:4:outofmemory 85445
    !!!
    

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64. 5 MB
    

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71. View Slide

72. DO THE
    ANSWER DANCE.
    Don’t struggle to learn why your app is slow.
    Get answers with Skylight.
    SKYLIGHT
    

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