gistfile1.txt

1. generate the app:

 merb-gen app pooltesting --orm datamapper

2. add the setup string to config/environments/development.rb

  Merb::BootLoader.after_app_loads do 
    DataMapper.setup(:default, 'mysql://root@localhost/test')
  end

3. generate a resource
  merb-gen resource tester

4. add route to config/router.rb:

  resources :testers
  
5. define model in tester.rb

  property :id, Serial, :key => true
  property :name, String

6. automigrate

  rake dm:db:automigrate
  
7. add some data

  $ merb -i
  Tester.create(:name => "mattetti")

8. start the merb cluster
  $ merb -c2 -n
  
9. test with a browser
  http://localhost:4000/testers/
  
FAIL undefined method `link_to' for #<Testers:0x1212784>

10. edit init.rb

  uncomment dependency "merb-assets"
  
11. restart the server
  $ ctrl + c
  $ merb -c2 -n

12. browser testing
  http://localhost:4000/testers/
  
13. put under load
  $ ab -c 2 -n 5000 http://0.0.0.0:4000/testers/    (in a different shell)
  
14. change a model
  in your editor save the model a few times (10-15 times in a row)
  
15. look at merb console:

  merb: worker (port 4000) ~ Starting Mongrel at port 4000
  merb: worker (port 4000) ~ Couldn't bind to port 4000.
  merb: worker (port 4000) ~ Waiting for it to become available
  Fri Oct 03 18:23:53 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  Fri Oct 03 18:23:59 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  Fri Oct 03 18:24:05 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  Fri Oct 03 18:24:11 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  Fri Oct 03 18:24:17 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  Fri Oct 03 18:24:23 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  Fri Oct 03 18:24:29 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  Fri Oct 03 18:24:35 -0700 2008: Reaping 1 threads for slow workers because of 'shutdown'
  Waiting for 1 requests to finish, could take 60.0 seconds.
  merb: worker (port 4000) ~ Exiting port 4000
  merb: worker (port 4000) ~ Successfully bound to port 4000