all requests on a single thread

[yob]

I've just tried puma on a rails 3.1.1 app. I added 'config.threadsafe!' to 'config/environments/production.rb' and get the following output when I boot the app:

⚡ RAILS_ENV=production bundle exec puma --threads 0:3
Puma 0.9.1 starting...
* Min threads: 0, max threads: 3
* Listening on tcp://0.0.0.0:9292
Use Ctrl-C to stop

I then created a controller action that looks like this:

def index
    product.connection.select_all("select sleep(10)")
    render :text => "I should have taken 10 seconds! (id: #{Thread.current.object_id})"
end

If I make 2 concurrent requests they seem to execute serially and the thread ID is identical. Am I missing something?

[evanphx]

That's odd. Could you replace the 2nd line with just "sleep 10" and see what happens?

Perhaps
a) you're on MRI 1.8 or 1.9 and
b) the database adapter you're using uses a C extension (likely) and
c) the C extension doesn't release the GVL nor does it use rb_thread_select (likely)

[yob]

my bad, my testing methodology was flawed. Testing with ab shows the expected results.

On MRI 1.9.3 both:

sleep(n)

and (with mysql2):

Product.connection.select_all("select sleep(#{n})")

result in fully concurrent requests. Thanks!