I finally tested this in Docker the results were strange, File.ls is still
faster but not by as much.
iex(20)> fn -> Enum.each(0..500, fn _ -> File.ls("lib/utils") end) end |>
:timer.tc |> elem(0) |> Kernel./(1_000_000)
1.05333
iex(21)> fn -> Enum.each(0..500, fn _ -> :os.cmd('ls lib/utils') |>
to_string() |> String.split("\n") end) end |> :timer.tc |> elem(0) |>
Kernel./(1_000_000)
2.819828
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