Profiling Ruby Applications
You can now use Developer Mode to view detailed performance
profiles of your controller actions. Just install the
ruby-prof gem and an option will appear in the UI to
toggle profiling.
Once you turn profiling on, RPM will give you a list of profiles to examine for each controller action invoked.
Until you enable profiling in the UI there is no additional
overhead
or instability; however, once you turn on profiling you may
notice
pages rendering more slowly, and the Rails app may become
unstable.
Profiling is a useful tool for understanding the detailed
interaction
happening in your application but you should never use this outside
of
a developer's sandbox.