Using stackprof and rspec (Rails)

README.md

1. Existing rspec-stackprof is "empty"
2. stackprof is written as a replacement for perftools.rb
3. Added an environment variable to conditionally run the profiler, it slows down test runtime by a couple of seconds for me.
4. Just add stackprof.rb to your spec/support folder, which is loaded on rails_helper.rb

stackprof.rb

if ENV['STACKPROF']
  require 'stackprof'

  RSpec.configure do |config|
    config.before :suite do
      StackProf.start(mode: :cpu, interval: 1000, out: 'tmp/stackprof-cpu-myapp.dump')
    end

    config.after :suite do
      StackProf.stop
      StackProf.results
    end
  end
end

# STACKPROF=TRUE rspec
# stackprof tmp/stackprof-cpu-*.dump --text

StackProf.start(mode: ENV['STACKPROF'].to_sym, interval: 1000, out: "tmp/stackprof-#{ENV['STACKPROF']}-myapp.dump") is way more useful, this way you can do STACKPROF=cpu or any other mode