Newrelic developermode not working with ruby-prof

Question

I'm using the newrelic_rpm developer mode locally in a rails 3.2 app. This is working fine.

When I install ruby-prof and click "start profiling" in the newrelic local dashboard and go back to my app, every page in my app gives "undefined method `pop' for #.

The top few lines of the traceback:

newrelic_rpm (3.6.4.122) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:421:in `ensure in perform_action_with_newrelic_profile'
newrelic_rpm (3.6.4.122) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:421:in `perform_action_with_newrelic_profile'
newrelic_rpm (3.6.4.122) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:305:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.6.4.122) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:37:in `process_action'
actionpack (3.2.13) lib/abstract_controller/base.rb:121:in `process'

Any ideas how to work out what's going wrong?

Delectate

Answer 1

I know it's been a while, but we've fixed the issue that was preventing ruby-prof from working in developer mode previously, so you should now be able to use it again with recent versions of the agent (3.7.3 and later). I'll get that known issues page updated also.

Gallium

Great, thanks. I'm switching this to the approved answer, as 3.5.8.72 is (I believe) a bit out of date for using with newrelic on the server – Delectate

Answer 2

Dropped back to version 3.5.8.72 and it worked again. Just update your Gemfile with gem "newrelic_rpm", "3.5.8.72". I've logged an issue with them on it.

Bane

fantastic, thanks. Didn't realize this was a regression. can you share the issue url (for me and others). – Delectate

It's behind zendesk, so not sure if it's a private ticket: support.newrelic.com/requests/45254 - Unfortunately the news isn't great: "Unfortunately, this is a known issue with version 3.6.x, and we're unlikely to push a fix any time soon." – Bane

thanks. It is a private ticket. They said they will update the known issues page with this until it is fixed. – Delectate

Documented at newrelic.com/docs/ruby/developer-mode#known_issues "ruby-prof for Ruby 3.5.8.72" – Delectate