bench.ex

defmodule Bench do
  def bench do
    :timer.tc(fn -> Enum.reduce(Range.new(0, 10000000), 0, &Kernel.+/2) end) |> IO.inspect
    :timer.tc(fn -> Enum.reduce(Range.new(0, 10000000), 0, fn acc, n -> acc + n end) end) |> IO.inspect
  end
end

running.sh

rindr:bench yapee$ MIX_ENV=prod mix compile
Compiling 1 file (.ex)
rindr:bench yapee$ MIX_ENV=prod mix run -e "Bench.bench"
{1846782, 50000005000000}
{1850227, 50000005000000}