Beatwc

  def chunkynifs(path, chunksize \\ @chunk_size) do
    File.stream!(path, [], chunksize)
    |> Enum.reduce(0, fn(chunk, total) -> total + count(chunk) end)
  end

  defp count(binary) do
    search = :binary.compile_pattern(<<"\n">>)
    :erlang.length(:binary.matches(binary, search))
  end

Timing Results