Slides for my talk at OSCon 2011 on scalability vs performance, frameworks for non-blocking I/O and message queues.

3. Required Listening “ But your new shoes are worn at the heels and your suntan does rapidly peel and your wise men don't know how it feels to be thick as a brick. ”

6. Scalability, not performance

8. JAVA concurrency in practice

9. Blocking code example - Download a list of URLs Ruby Python

11. Benchmark - Blocking

12. Benchmark – Blocking + Threads

13. Benchmark - Non-Blocking (Eventmachine based)

15. Python and Twisted

16. Python and Twisted – callback styles Explicit Inline

17. Python and Twisted – Generators Generators

18. Python and Twisted – Deferreds Not Deferreds Deferreds

19. Python and Twisted – Callbacks Callbacks

20. Python and Twisted – Inline callbacks Results from getPage

21. Python and GEvent Monkey patch the socket module

22. Python and GEvent C reate and start greenlets

23. Ruby and EventMachine

24. Ruby and EventMachine - Generators Generator

25. Ruby and EventMachine - Deferreds Sort of deferred

26. Ruby and EventMachine - Callbacks Success and error callbacks

27. Ruby, EventMachine and EM-Synchrony

28. Ruby, EventMachine and EM-Synchrony Inline results

29. Node.js

30. Node.js – Creating and ending the requests Start requests End requests

31. Node.js – Events handlers and callbacks Response event

32. Erlang

33. Erlang – Spawning one download process per url

34. A reminder of what we wanted to do

35. Blocking code example - Download a list of URLs Ruby Python

36. Architectural building blocks

37. M e ssage Queues – decoupling downloads

38. M e ssage Queues – decoupling db writes on a webservice

39. Coupled comments webservice Receive and write to db

40. Message Queue – Comment producer Receive and write to queue, release connection

41. Message Queue – Comment consumer Take from queue and write to db

42. Cache

43. No cache – code from http://github.com/gleicon/vuvuzelr

44. Cache – code from http://github.com/gleicon/vuvuzelr Check if it ’ s on cache Return if it is Feed the cache and set expiration

46. Q & A

47. Thanks !