How to debug and profile rails library code ( in windows )

Rails
1

Hi,
I have a project on windows using rails 2.3.5, ruby 1.8.6, mysql 5.0.28,
and mysql gem 2.8.1.

I am trying to debug a problem where it seems like each rails thread
hangs before it has the chance to release the db connection to the pool.
When the number of active connections reaches the total number available
in the pool, the next request times out for five seconds before getting
processed.

I have tried many things to identify what is causing this problem and
now I think I need to run profiling and/or debugging inside the rails
code to find out where it is hanging. (For example - I’ve gotten rid of
database session stores to see if that was the cause, as older posts
have indicated.)

How do I configure my project which currently has gems installed for
rails to use source code so I can edit and debug it?

Thanks,

Ryan

2

Thanks Luke - freezing the gems is what I need because I am embedding
ruby profile calls in there.

However, now I’m trying to add the profiling inside mongrel, because the
profiling I added in ActionController::Base.process did not show me
where the delay is occurring.

I did an unpack of mongrel and copied it to vendor along with adding the
profiling code, but I’m unable to get the vendor version of
mongrel_rails to execute when I run the script\server.

How do I get the mongrel_rails executable in vendor override the one in
path?

thanks!

How do I configure my project which currently has gems installed for
rails to use source code so I can edit and debug it?

I assume you’re debugging anyways:

Debugging Rails Applications — Ruby on Rails Guides

If you do that you can step out into the rails code to see what’s
happening. If you want to actually put debug lines into rails source
code then how about freezing the rails gems into your project? Then you
could edit them and step out at any point you like.

Cheers
Luke

3

Keeping it simple - you could just rename the one in your ruby bin
directory or uninstall the mongrel gem! :slight_smile:

4

How do I configure my project which currently has gems installed for
rails to use source code so I can edit and debug it?

I assume you’re debugging anyways:

If you do that you can step out into the rails code to see what’s
happening. If you want to actually put debug lines into rails source
code then how about freezing the rails gems into your project? Then you
could edit them and step out at any point you like.

Cheers
Luke