The document introduces 'Zeus', a system designed to improve the performance of Rails applications by preforking and managing the Rails environment. It details the installation process, functionalities, and intended use cases of Zeus, highlighting that it can significantly speed up certain tests while warning against its use for database-dependent views. The document also mentions some limitations and issues, particularly with file recognition and shared folders.

2. Hi I am Phil!
@sideshowcoder (github)
@cospired (work)

3. Lightning fast rails with
zeus

4. ...or more like

5. This is what we got...

6. This is what we want...*
* or faster!!!111elf!

7. Ruby 1.9

8. Ruby 2.0

9. So what is Zeus?

10. System for preforking and
managing a Rails Env

11. FileMonitor
keep track of modifications to reload the
environment as needed

12. SlaveMonitor
Keep an environment ready for you at all
time

13. ClientRequest Handler
Dispatch calls by the clients to slaves

14. Setting it all up
gem 'zeus'... I got it in my Gemfile

15. Recompile ruby?
Actually I don't and it's not been a problem
so far...

16. ./bin/zeus init
binstubs are great, and make zeus faster

17. config.json

18. It's pretty hassle free
... and works most of the time just fine

19. No zeus specific code in
the app
or tests

20. What to not use it for...

21. Zeus won't make your DB
dependent view tests fast
and shouldn't because they should not
depend...

22. Zeus will make your rails
dependent PORO tests
fast
... not sure if this is a good thing so!

23. So be carefull zeus can
be to good to be true
sometimes

24. Slow tests are slow
don't fix with duck-tape and staples...

25. What to use it for...

26. rake routes shouldn't take
30sec or so...

27. rails runner ... as well
run all rails commands in a sane amount of
time

28. Some issues...

29. Be ready to restart...
because new files are not recognized

30. Vagrant shared folders
CIFS does not like sockets*
* currently discussion around that in the issues #287 #231

31. So overall...
it works, there are a lot of valid usecases, ...
and some not so valid

32. Questions?
Thanks!

33. Ressources
● http://robots.thoughtbot.
com/post/40193452558/improving-rails-boot-
time-with-zeus
● https://github.com/burke/zeus/
● https://github.com/sideshowcoder/zeus for
configurable sock location
● https://github.com/rails/commands
● https://github.com/sporkrb/spork
● https://github.com/jonleighton/spring