Angelina Ballerina Learns about Memory Allocation

Memory issues can be a black box often thrown over the fence for the most senior level developers to solve. For newer developers it seems like all of a sudden, your app is failing and you're seeing red everywhere. You've optimized your database queries but are still running into issues. What does this all mean? How do you figure out what's going on without solely passing it off to someone else? You'll walk away from this talk with an understanding of what memory allocation means and the tools you can use to assess what's happening.

Presented at Curry on Conf 2017 and Strange Loop 2017

Transcript

1. Angelina Ballerina Learns about Memory Allocation Allison McMillan @allie_p
2. https://www.khanacademy.org/computing/computer-programming/programming-games-visualizations/memory-game/a/intro-to-memory
3. Photo: Getty Images
4. BRYAN WOOLSTON / Reuters MinnPost illustration by Jaime Anderson http://www.clotureclub.com/2013/07/22-things-most-dc-people-do/
10. https://www.youtube.com/watch?v=GFfGzNXnJE8
11. https://digiday.com/marketing/the-new-face-of-programmatic-efficacy-over-efficiency/
13. First Seek to Understand - Stephen Covey
14. http://www.buzinga.com.au/buzz/app-development-jargon-glossary/
15. http://blackgeekygirl.deviantart.com/art/Little-Miss-Smartypants-515026930
16. Definitions Scenarios Concepts Tools
17. https://www.goodreads.com/book/show/492812.Angelina_Ballerina
18. http://bookinwithbingo.blogspot.com/2011/04/
20. https://www.pinterest.com
23. http://www.wikihow.com/Find-Your-Own-Dancing-Style
24. www.pinterest.com
25. https://www.pinterest.com/pin/497507090057749846/
26. https://s-media-cache-ak0.pinimg.com/originals/01/69/1a/01691a66976f8e035a34990fb63e22de.jpg
27. http://www.vashtie.com/culture/disneys-aladdin-still-us-dreaming-three-wishes/
31. https://giphy.com/gifs/jecamartinez-ballet-ballerina-tippy-toes-yoJC2K2zjyPhKzg8lq
32. http://gifsgallery.com/angelina+ballerina+gif
33. https://giphy.com/gifs/loop-ballet-perfection-Ez1XmttaHzjQ4
39. https://www.pinterest.com/pin/766245324070166230/
40. Memory Can I have a box?
41. + Memory
42. Heap Stack
43. Stack Clean room Help with dinner Do a chore
44. Heap
45. http://code.chaoscreated.com/
46. Heap Turn Position Technique
47. Heap Machine Heap Ruby Heap
48. Heap Dance Heap Ballet Heap
49. Heap Dance Heap Ballet Heap Page Page Page
50. Heap Machine Heap Ruby Heap Page Node/Slot Ruby Object
51. Heap Dance Heap Ballet Heap Feet Positions Node/Slot First position Node/Slot Fourth position https://dancer.com/ballet-info/in-the-studio/terms-positions/
52. Open slot
53. new first open slot Bump Pointer Allocation
54. Eden page Retained objects
55. http://artandpractice.blogspot.nl/2013/04/huma-1315-chapter-8-dance.html new memory
59. Garbage collection is a type of automatic memory management that makes a program seem like it has infinite memory by reclaiming objects that are no longer in use.
60. www.youtube.com
61. https://alchetron.com/John-McCarthy-(computer-scientist)-1012892-W
62. http://imgur.com/gallery/btPUV
63. https://giphy.com/gifs/cheezburger-funny-amazing-76D0WNoMfMOyc
64. https://en.wikipedia.org/wiki/Box_Step
65. http://makeagif.com/gif/stanford-viennese-ball-2013-opening-committee-waltz-cH-YJy
66. Heap
67. Heap
68. Heap
69. Object Graph Heap object Root References References Heap object Heap object
70. http://classicalballetnews.com/how-to-releve-in-ballet-video/how-to-releve-in-ballet/
71. Stack Clean room Help with dinner Do a chore Angelina, Clean your room
72. Ballet Heap Page
73. https://www.tumblr.com/search/ballet%20perfection
74. Granule Chunk Lists
75. Slot Slot Slot Slot
76. Slot Slot Slot Slot r value
77. https://speakerdeck.com/pat_shaughnessy/visualizing-garbage-collection-in-rubinius-jruby-and-ruby-2-dot-0
78. “first position” class: Position Object: position1 = Position.new
79. Object: position1 = Position.new Address
81. Program Footprint
82. https://www.pinterest.com
83. Object Space
84. Mutator Collector
85. https://hirshhorn.si.edu/kusama/infinity-rooms/
86. http://gifrific.com/baby-groot-dancing-guardians-of-the-galaxy/
87. http://www.blu-ray.com/movies/screenshot.php?movieid=44938&position=5
88. Root
89. https://www.gutenberg.org/files/27367/27367-h/27367-h.htm Root
90. Root
91. https://www.americandancesportcenter.com/waltz
92. http://tech.eu/features/2921/enevo-waste-management-profile/
93. Root
94. 1 1 1 1 1 0 0 0
95. 1 1 1 1 1 0 0 0
96. https://pixabay.com/en/playmobil-toy-garbage-collector-771313/
97. FromSpace ToSpace
98. FromSpace ToSpace
99. Pointer FromSpace ToSpace
100. FromSpace (formerly ToSpace) ToSpace
101. FromSpace
102. Mark Sweep Compact
103. Root
104. Root
105. Root
106. Root
107. Root
108. Root
109. https://giphy.com/gifs/dance-black-and-white-dancing-FobM3MLsUVmnu
110. https://dribbble.com/shots/3588547-Hiplet-Desigual-2
111. Generation 0 Generation 1 Root
112. Generation 0 Root
113. Generation 0 Root
114. Generation 0 Root
115. Generation 1 Root
116. Generation 1 Generation 0 Root
117. Generation 1 Generation 0 Root
118. Generation 1 Generation 0 Root
119. Generation 1 Generation 0 Root
120. Write barrier Generation 1 Generation 0 Root
121. Generation 1 Generation 0 Root
122. Dancing with the stars
123. https://coderwall.com/p/yutdhq/understanding-garbage-collection-p1-2
124. Root
125. Root
126. https://giphy.com/gifs/agentm-agent-m-Xdcj75alQutVe
127. writer barrier Root
128. https://www.pinterest.com/pin/470626229787955295/
132. https://i2.wp.com/sassandbalderdash.com/wp-content/uploads/2014/03/letitgo7.gif
133. Rails Apps Retained Memory Allocated Memory = +
135. http://www.pastposters.com/details.php?prodId=4009
136. 2.3.1 :001 > GC.stat(:total_freed_objects) => 97198
137. http://gifrific.com/uga-mens-swim-and-dive-team-harlem-shake-dance/
138. {
 :count=>0,
 :heap_allocated_pages=>24,
 :heap_sorted_length=>24,
 :heap_allocatable_pages=>0,
 :heap_available_slots=>9783,
 :heap_live_slots=>7713,
 :heap_free_slots=>2070,
 :heap_final_slots=>0,
 :heap_marked_slots=>0,
 :heap_swept_slots=>0,
 :heap_eden_pages=>24,
 :heap_tomb_pages=>0,
 :total_allocated_pages=>24,
 :total_freed_pages=>0,
 :total_allocated_objects=>7796,
 :total_freed_objects=>83,
 :malloc_increase_bytes=>2389312,
 :malloc_increase_bytes_limit=>16777216,
 :minor_gc_count=>0,
 :major_gc_count=>0,
 :remembered_wb_unprotected_objects=>0,
 :remembered_wb_unprotected_objects_limit=>0,
 :old_objects=>0,
 :old_objects_limit=>0,
 :oldmalloc_increase_bytes=>2389760,
 :oldmalloc_increase_bytes_limit=>16777216
 }
139. Heap Allocated Pages Pages
140. Heap Sorted Length Slots
141. Heap available slots Slots
142. Heap live slots
143. Heap Free Slots
144. Heap Final Slots Root
145. Total Allocated Objects Root
146. Total Freed Objects Root
147. 2.3.1 :001 > GC.stat[:count]
148. GC::Profiler.enable 10000.times do puts “angelina turns” end GC.start puts GC::Profiler.result GC::Profiler.disable
149. Index 1 Invoke Time(sec) 0.075 Use Size(byte) 584120 Total Size(byte) 1207680 Total Object 30192 GC Time(ms) 1.91500000000000003553
150. > ObjectSpace.each_object
151. Object Space
152. 2.3.1 :003 > ObjectSpace.count_objects => {:TOTAL=>53805, :FREE=>7063, :T_OBJECT=>11 10, :T_CLASS=>919, :T_MODULE=>42, :T_FLOAT =>4, :T_STRING=>28307, :T_REGEXP=>195, :T_ ARRAY=>5470, :T_HASH=>180, :T_STRUCT=>3, : T_BIGNUM=>2, :T_FILE=>12, :T_DATA=>269, :T _MATCH=>130, :T_COMPLEX=>1, :T_SYMBOL=>7, :T_IMEMO=>5201, :T_NODE=>4842, :T_ICLASS=> 48}
153. Derailed Benchmarks Memory_profiler Rack-mini-profiler get_process_mem
154. http://harlequinblog.com/2016/08/11-signs-youre-a-book-lover-and-should-be-celebrating-national-book-lovers-day/
155. https://www.emaze.com/@AWZCLQTQ/Rube-Goldberg-Machine
156. Resources http://daydreamsinruby.com/ memory-resources/
157. Thank you
158. @allie_p allison.p.mcmillan@gmail.com www.collectiveidea.com www.daydreamsinruby.com