Ruby ruby-prof
From wikinotes
A cross platform profiler for ruby.
dump to a file, then obtain reports like flamegraphs, call-trees, etc.
Documentation
official docs https://ruby-prof.github.io/
Example
1: Add 'ruby-prof' to Gemfile 2: bundle install 3: write file: | # foo.rb result = RubyProf.profile do # ... your code ... end printer = RubyProf::CallStackPrinter.new(result) Tempfile.create(["foo", ".html"]) do |fo| printer.print(fo) %x{open -a "Google Chrome.app" -W "#{fo.path}"} end 4: cat foo.rb | rails c 5: a colour-coded flamegraph!