Premature optimisation: The Root of All Evil

1. PREMATURE OPTIMIZATION The Root of ALL Evil @akitaonrails

2. @akitaonrails

3. Rubyconf Brasil 2016 – September 23 - 24

4. Rubyconf Brasil 2016 – September 23 - 24

5. September 23 - 24 @rubyconfbr

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

7. SPA e-commerce

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

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

10. High Level Numbers

11. Client #1

12. $ 4,000

13. $ 4,000 ($ 7 MI/yr revenue - 0.68%)

14. Client #2

15. $ 100,000+

16. $ 100,000+ ($ 800 MI/yr revenue - 0.15%)

17. • Minimum IT Cost:

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

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

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

21. • 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)

22. • 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:

23. • 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

24. • 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%

25. Increase Revenue > Lower Costs

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

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

28. SaaS > IaaS (avoid doing yourself)

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

30. • /do/you/have/friendly/urls?

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

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

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

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

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

36. • /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!

37. 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

38. y = x * 320

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

40. • NO Test Suite with below 70% coverage

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

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

43. • 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!!!

44. • 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

45. • 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

46. • 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!!

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

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

49. Maintainability > Performance

50. PRIORITIES!

51. • SQL N+1 Queries

52. • SQL N+1 Queries • Too much SQL

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

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

55. • 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

56. • 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

57. • 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

58. No Metrics No Optimization

59. - Alan Kay

60. “Make it Work - Alan Kay

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

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

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

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

65. 275k Merchants $ 72 Mi - Q1 2016 Founded: 2004, with Rails pre-1.0

66. Rails works because it didn’t have Facebook, Google or Microsoft

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

68. • Increase Revenue > Lower Costs

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

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

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

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

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

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

75. • 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

76. PREMATURE OPTIMIZATION is the Root of all Evil

77. THANKS! www.codeminer42.com @akitaonrails