timer.tc

{time_in_microseconds, ret_val} = :timer.tc(fn -> app.run() end)

Busy waiting is definitely not a appropriate way to measure performance, b/c it directly affects performance by itself.

How do you know when a process has finished its job? Does it die, or tell someone, or does it just become dormant waiting for a message?

Just wait for them to end.

something like

1..900
|> Enum.map(fn -> Task.async(fn -> do_some_work() end) end)
|> Enum.each(& Task.await(&1))

or use receive that blocks

I created a gist with a basic example of one possible implementation

Got it! I’ll need to change my code a litle bit but I’ve got the idea! The goal is send a message to the main process when each sub-process finish his hob. God idea! Thank you!