Otimização Prematura: a Raíz de Todo o Mal

1. PREMATURE
OPTIMIZATION
The Root of ALL Evil
@akitaonrails

2. @akitaonrails

7. Rubyconf Brasil 2016 – September 23 - 24

8. Rubyconf Brasil 2016 – September 23 - 24

9. September
23 - 24
@rubyconfbr

10. PREMATURE
OPTIMIZATION
The Root of ALL Evil
@akitaonrails

12. “Premature Optimization
is the Root of All Evil”
- Don Knuth

15. SPA e-commerce

17. SPA e-commerce
http://www.loja.com.br/#!/produtos/item-001

18. SPA e-commerce
http://www.loja.com.br/#!/produtos/item-001
http://www.loja.com.br/?_escaped_fragment_=/produtos/item-001

19. High Level
Numbers

20. Client #1

25. $ 4,000

26. $ 4,000
($ 7 MI/yr revenue - 0.68%)

27. Client #2

31. $ 100,000+

32. $ 100,000+
($ 800 MI/yr revenue - 0.15%)

34. • Minimum IT Cost:

35. • Minimum IT Cost:
• USD 1000 - Cloud Services

36. • Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer

37. • Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1“Responsible”(Manager, Marketing, etc)

38. • Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1“Responsible”(Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)

39. • Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1“Responsible”(Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)
• Minimum Business Requirement:

40. • Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1“Responsible”(Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)
• Minimum Business Requirement:
• Revenue: > USD 2 MI / year

41. • Minimum IT Cost:
• USD 1000 - Cloud Services
• USD 3000 - 1 Developer
• USD 4000 - 1“Responsible”(Manager, Marketing, etc)
• Total: USD 8.000/month (USD 96.000/year)
• Minimum Business Requirement:
• Revenue: > USD 2 MI / year
• IT Cost / Revenue ratio: < 5%

43. Increase Revenue
>
Lower Costs

45. Open > Proprietary
(prefer“Best of Breed”)

47. Cloud > On-Premise
(Infrastructure/Platform as a Service)

54. SaaS > IaaS
(avoid doing yourself)

57. SEO & SEM
(should not be Astrology!)

59. • /do/you/have/friendly/urls?

60. • /do/you/have/friendly/urls?
• sitemap.xml?

61. • /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?

62. • /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?

63. • /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?
• Periodic ORIGINAL CONTENT publishing?

64. • /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?
• Periodic ORIGINAL CONTENT publishing?
• No duplication duplication of content content?

65. • /do/you/have/friendly/urls?
• sitemap.xml?
• Proper HTTP 301 Redirections?
• Social Network buttons?
• Periodic ORIGINAL CONTENT publishing?
• No duplication duplication of content content?
• THEN OK!

67. I.
II.
III.
IV.
V.
VI.
VII.
VIII.
IX.
X.
XI.
XII.
Codebase One codebase tracked in revision control, many deploys
Dependencies Explicitly declare and isolate dependencies
Config Store config in the environment
Backing services Treat backing services as attached resources
Build, release, run Strictly separate build and run stages
Processes Execute the app as one or more stateless processes
Port binding Export services via port binding
Concurrency Scale out via the process model
Disposability Maximize robustness with fast startup and graceful shutdown
Dev/prod parity Keep development, staging, and production as similar as possible
Logs Treat logs as event streams
Admin processes Run admin/management tasks as one-off processes

70. y = x * 320

71. y = x * 320
y = (x << 8) + (x << 6)

73. • NO Test Suite with below 70% coverage

74. • NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating

75. • NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC

76. • NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!

77. • NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!
• NO functions with more than 1 page down

78. • NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!
• NO functions with more than 1 page down
• NO table with dozens of fields

79. • NO Test Suite with below 70% coverage
• NO CodeClimate below 3.0 rating
• NO source code file with hundreds of LOC
• NO COPY AND PASTE EVERYWHERE!!!
• NO functions with more than 1 page down
• NO table with dozens of fields
• NO hours to clone, setup and deploy!!

81. Spree: 68k LOC
40k are Specs! (60%)

82. Magento2: 300k LOC
127k are Specs! (< 30%)

84. Maintainability
>
Performance

87. PRIORITIES!

94. • SQL N+1 Queries

95. • SQL N+1 Queries
• Too much SQL

96. • SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic

97. • SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes

98. • SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes
• Too much unused code that was not removed

99. • SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes
• Too much unused code that was not removed
• No CDN or proper HTTP Cache invalidation headers

100. • SQL N+1 Queries
• Too much SQL
• Too much SQL LIKE instead of Elastic
• Lack of proper SQL indexes
• Too much unused code that was not removed
• No CDN or proper HTTP Cache invalidation headers
• Too much synchronous work that should be async jobs

101. No Metrics
No Optimization

103. - Alan Kay

104. “Make it Work
- Alan Kay

105. “Make it Work
Make it Correct
- Alan Kay

106. “Make it Work
Make it Correct
Make it Fast
- Alan Kay

107. “Make it Work
Make it Correct
Make it Fast
Make it Cheap”
- Alan Kay

113. You != Unicorn
(nor Facebook, Google, Amazon, etc)

114. “Casa de Ferreiro, Espeto de FERRO!”

116. • Increase Revenue > Lower Costs

117. • Increase Revenue > Lower Costs
• “Best of Breed”Open Source

118. • Increase Revenue > Lower Costs
• “Best of Breed”Open Source
• SaaS > PaaS > IaaS > On-Premise

119. • Increase Revenue > Lower Costs
• “Best of Breed”Open Source
• SaaS > PaaS > IaaS > On-Premise
• SEO & SEM =~ Astrology

120. • Increase Revenue > Lower Costs
• “Best of Breed”Open Source
• SaaS > PaaS > IaaS > On-Premise
• SEO & SEM =~ Astrology
• Maintainability > Performance

121. • Increase Revenue > Lower Costs
• “Best of Breed”Open Source
• SaaS > PaaS > IaaS > On-Premise
• SEO & SEM =~ Astrology
• Maintainability > Performance
• PRIORITIES!!

122. • Increase Revenue > Lower Costs
• “Best of Breed”Open Source
• SaaS > PaaS > IaaS > On-Premise
• SEO & SEM =~ Astrology
• Maintainability > Performance
• PRIORITIES!!
• No Metrics, No Optimization

123. • Increase Revenue > Lower Costs
• “Best of Breed”Open Source
• SaaS > PaaS > IaaS > On-Premise
• SEO & SEM =~ Astrology
• Maintainability > Performance
• PRIORITIES!!
• No Metrics, No Optimization
• You != Unicorn

124. PREMATURE
OPTIMIZATION
is the Root of all Evil

126. THANKS!
www.codeminer42.com
@akitaonrails