tracepoint.rb

# https://speakerdeck.com/a_matsuda/3x-rails
# メソッド呼び出し回数の記録
class MethodCounter
  def initialize(app)
    @app = app
  end
  def call(env)
    calls = []
    trace = TracePoint.new(:call, :c_call) do |tp|
      calls << [tp.defined_class, tp.method_id, tp.lineno]
    end
    trace.enable
    ret = @app.call env
    trace.disable
    pp calls.group_by(&:itself).map {|k, v| {k => v.length}}.sort_by {|h| -h.values.first}
    ret
  end
end
use MethodCounter