all requests on a single thread about puma

[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!