All zero
Does this support Rails 4.2? I've just installed it and it's outputting reports with all the call data, but all times are 0.00 (with NaN%).
This is a good question -- I'm not sure. It's just a very thin wrapper around RubyProf, so there shouldn't be anything Rails-specific in it. You could try the newest version of RubyProf and see if that helps.
For my own stuff, I've pretty much completely moved over to MiniProfiler -- you should try that one out if you haven't yet!
Getting the same problem on Rails 4.2. MiniProfiler worked great though!
If you can get mini profiler to do quite the same thing (ruby_prof-style GraphPrinter-type report of all methods), I can't figure out how! Was hoping for this one, but it does seem to be long-abandoned. :(