On my Mac :os.cmd is way slower (I can test on docker later this afternoon
if needed, but I assume we would see something similar).
iex(8)> 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)
5.006744
iex(9)> fn -> Enum.each(0..500, fn _ -> File.ls("lib/utils") end) end |>
:timer.tc |> elem(0) |> Kernel./(1_000_000)
0.08175
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