ruby/benchmark/struct_accessor.yml

prelude: |
  C = Struct.new(:x) do
    def initialize(...)
      super
      @ivar = 42
    end

    attr_accessor :ivar

    class_eval <<-END
      def r
        #{'x;'*256}
      end
      def w
        #{'self.x = nil;'*256}
      end
      def rm
        m = method(:x)
        #{'m.call;'*256}
      end
      def wm
        m = method(:x=)
        #{'m.call(nil);'*256}
      end
      def r_ivar
        #{'ivar;'*256}
      end
    END
  end
  # 200 members do not fit in a GC slot, so this struct is not embedded
  H = Struct.new(*(1..200).map { |i| :"m#{i}" }) do
    class_eval <<-END
      def w
        #{'self.m200 = nil;'*256}
      end
    END
  end
  C.new(nil) # ensure common shape is known
  obj = C.new(nil)
  heap_obj = H.new
benchmark:
  member_reader: "obj.r"
  member_writer: "obj.w"
  member_writer_heap: "heap_obj.w"
  member_reader_method: "obj.rm"
  member_writer_method: "obj.wm"
  ivar_reader: "obj.r_ivar"