How to diagnose slow rails / rake / rspec tasks

Question

I always have a significant delay (c.10 seconds) when running tasks like:

rails server
rake assets:precompile
rspec spec

The delay is at the point before it says:

    Connecting to database specified by database.yml

I've found several articles identifying 10 or more different parameters that can be tuned to speed up rake and / or rspec runs. But I'm reluctant to start fiddling around with 10 different parameters without a better understanding of what's causing it.

Is there way to diagnose what's causing that delay? Like something more verbose?

Supplementary info: Ubuntu 14 Ruby 1.9.3 Rails 3.2

Possible duplicate of http://stackoverflow.com/questions/5637660/how-do-i-debug-a-slow-rails-app-boot-time — Max Williams, Jun 19 '15 at 08:53
@MaxWilliams thanks for that link, I'll look through the responses in that post. It MAY be a duplicate, but I note there was no accepted answer and it's also over 4 years old. — andyleesuk, Jun 19 '15 at 09:46
Yeah, i thought it would be a good source of leads at least... — Max Williams, Jun 19 '15 at 10:25
@MaxWilliams Mark Ellul's answer re: bumbler was actually quite cool (https://github.com/mark-ellul/Bumbler). I'm going to play around with that some more. — andyleesuk, Jun 19 '15 at 10:49

score 0 · Accepted Answer · edited May 23 '17 at 10:26

Thanks to @MaxWilliams for the link to this post How do I debug a slow rails app boot time?

I started using Mark Ellul's Bumbler - http://github.com/mark-ellul/Bumbler

It gave me exactly what I wanted - an insight into what's going in the background and which gems are taking the time. Of course I still need to speed up the slow ones (fog and authlogic seem to be two of the main culprits). But that's at different question.

How to diagnose slow rails / rake / rspec tasks

1 Answers1