Ruby profiling

perf.rb

# gem 'ruby-prof'

module WithProfiling

  def self.run
    RubyProf.start
    puts 'Start'
    
    result = yield
    
    puts 'End'
    result = RubyProf.stop

    file_path = "/tmp/callgrind.#{Time.now.strftime('%Y-%m-%d_%H-%M-%S')}"
    io = IO.new(IO.sysopen(file_path, 'w'), 'w')
    printer = RubyProf::CallTreePrinter.new(result)
    printer.print(io)
    io.close
    puts "qcachegrind #{file_path}"
    
    result
  end
end