singleton_speed.rb

require 'benchmark/ips'

class Foo
  def bar; end
end

def ic_hit obj
  obj.bar
end

z = Benchmark.ips do |x|
  10.times do |i|
    x.report "singleton #{i}" do
      foo = Foo.new
      foo.singleton_class
      ic_hit foo
    end
  end
end
print "ips,"
puts z.entries.map(&:ips).join(",")
print "stddev,"
puts z.entries.map(&:ips_sd).join(",")