Play Nice With Unicorns

First talk at SFRails with tips on playing nice with Unicorns.

http://www.meetup.com/SFRails/events/149935932/

Transcript

1. Joslyn Esser Play Nice With Unicorns
2. What’s a Unicorn?
4. HTTP Server
5. HAProxy NGINX Unicorn
6. Things Will Go Wrong
7. Snowball Effect
10. “Please Check Back Soon”
11. Hint: Nope Are users always patient?
12. = “Just Keep Refreshing”
13. Client Queue Worker
14. 1 Z Z Z ..
15. 1 Z Z Z ..
16. 2 1 Z Z Z ..
17. 2 1 Z Z Z ..
18. 3 2 1 Z Z Z ..
19. 3 2 1
20. 3 2
23. What to do?
26. Request Queuing
27. Where should I queue?
28. Single server?
30. Many servers?
31. Load Balancer
32. ? ? 0 20 200
33. Load Balancer 220
34. Max Queue Size?
35. Default: 1024
36. Many servers?
37. Load Balancer 1024 1024 1024
39. Load Balancer 1024 64 64 64
41. Timing Out
42. Sometimes Things Get Slow
43. Timeout
44. SIGKILL
45. Timeout
46. Timeout::Error
47. Which?
48. Use Both
49. Why?
50. Graceful
51. Wild West
52. Timeouts Fail
53. New Sheriff In Town
54. Controls Chaos
55. How Long?
56. Just Long Enough™
57. Different Per Request Type
58. Worst Case Scenario
59. Loading Code
60. What is Eager Loading?
61. Active Record
62. Load Now Run Later
63. What is Auto Loading?
64. Run Now Load When Needed
65. ...in Production Eager Load All The Things
66. Application Starts Some Code Eager Loads Request Begins Some Code Auto Loads Request Served
67. Application Starts All Code Eager Loads Request Begins Request Served
68. Why?
69. Lower Memory Usage
70. Copy On Write Ruby 2.x
71. Low Impact Deployments
72. Application Starts Some Code Eager Loads Request Begins Some Code Auto Loads Request Served
73. Application Starts All Code Eager Loads Request Begins Request Served
74. Happy Users
75. config.eager_load_paths
76. Recap
77. Ignore Closed Connections
78. Queue In The Right Place
79. Know Your Timeouts
80. Load Your Code
82. Play Nice
83. Thank You @joslynesser joslynesser.com github.com/joslynesser
84. We’re Hiring!