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readme.md

A tiny example of a rails app serving requests asynchronously.

relevant things to look at

  • mycontroller_controller.rb
  • application.rb (config.threadsafe!)
  • Procfile

how to run the server

synchronously: bundle exec thin start

asynchronously: bundle exec thin start --threaded

how to observe synchronous vs. asynchronous behavior

compare behavior when refreshing http://0.0.0.0:3000/mycontroller/slow and http://0.0.0.0:3000/mycontroller/fast. When running without threads, fast will always have to wait for slow. When running with threads, you can refresh fast with wild abandon while waiting for a request to slow to finish.

how to benchmark

ab -n 1000 -c 10 http://0.0.0.0:3000/mycontroller/fast

Threaded mode is successfully asynchronous, but serves fewer requests per second.

does it work asynchronously on heroku?

yes

open questions

  1. Is anyone in the world doing this in production?
  2. How does thin decide how many threads to create?
  3. What is the space complexity of each thread?
  4. Why is threaded slower? (MRI 1.9.2 and 1.9.3)

discussion elsewhere