Faster on Rails

How to make Rails application faster

Transcript

1. Faster on Rails David Paluy May 28, 2012
2. Me • Co-Founder, Startup. • Previously, Co-Founder AlgoTrading Startup • Working with Ruby, since 2007 dpaluy dpaluy davidpaluy IsraelRb @LinkedIn
3. Agenda • Usability • Web Servers • Rack Web Servers • Back-end • Front-end Note: Links
4. CNN Example Source WebPage Test by Google
5. Usability Delay User Reaction 0-100 ms Instant 0-300 ms Feels sluggish 100-1000ms Machine is working... 1s + Mental context switch 10s + I'll come back later... Source
6. Usability Delay User Reaction 0-100 ms Instant 0-300 ms Feels sluggish 100-1000ms Machine is working... 1s + Mental context switch We're here!!! (on average...) 10s + I'll come back later... Source
7. Navigation Timing (W3C) Source Measuring Site Speed with Navigation Timing – Ilya Grigorik
8. WebPageTest NY Times - test
9. Best Practice: Measure Analyze Optimize
10. Scaling Rails View 21 ScreenCasts by Gregg Pollack
11. Web Servers Process-Based Server Event-Based Server
12. Web Servers: Apache vs Nginx Source
13. Web Servers: Apache vs Nginx Source The main advantage of the asynchronous approach is scalability!
14. Rack Web Server Source
15. Rack Web Server by Source
16. Rack Web Server by Source
17. Rack Web Server Don't use Unicorn without NGINX! VS Read more about Unicorn here
18. Unicorn sucks at: • 3rd-party APIs • OpenID consumers • Reverse proxy implementations with editing/censoring • HTTP server push • Long polling • Reverse AJAX • Real-time upload processing
19. Rainbows! - Unicorn for sleepy apps and slow clients Rainbows ThreadPool Application Read more about Rainbows here and Github Source
20. Back-End
21. HTTP Pipelining Communication
22. SPDY – by Google • Allows client and server to compress request and response headers • Allows multiple, simultaneously multiplexed requests over a single connection • Allows the server to actively push resources to the client that it knows the client will need (e.g. JavaScript and CSS files) SPDY on Rails by Roman Shterenzon
23. Databases
24. N+1 redundancy
25. Tidbits: Automatic Query Explains (Rails 3.2) Log slow queries: Console: Source
26. Tidbits: Giant queries loading everything into memory Source
27. Tidbits: Kill Long Running Requests
28. Tidbits: Favicons and 404 Errors Avoid
29. Tidbits: Linux Server • ulimit -n • memcached -t x // x – CPU cores • Monitor everything (StatsD with Graphite, Munin, NewRelic, UnionStation)
30. Client Side • YSlow • PageSpeed by Google • HAML vs ERB (Source) • How to make your JavaScript Fast
31. Wish you Faster Browsing! Scaling = replacing all components of a car while driving it at 100 mph (Mike Krieger, Instagram)
32. References • WebPage Test by Google • PageSpeed by Google • SPDY by Google • How to scale a Ruby Web Service • Scaling Instagram • Measuring Site Speed with Navigation Timing
33. Thank you!