@async blocks

[rikhuijzer]

Is the following behaviour expected? The Time should be 10 seconds, that is, the meter should run concurrently during the "long" running fib computation. However, it always takes more than 10 seconds to finish:

julia> using ProgressMeter

julia> function show_progress()
           p = ProgressMeter.ProgressUnknown()
           for i in 1:10
               ProgressMeter.update!(p)
               sleep(1)
           end
           ProgressMeter.finish!(p)
       end;

julia> fib(n) = n <= 1 ? n : fib(n - 1) + fib(n - 2);

julia> @time fib(44);
  4.591181 seconds

julia> show_progress()
Progress:  0 	 Time: 0:00:10

julia> @async(fib(44)); show_progress();
Progress:  0 	 Time: 0:00:13

julia> @async(show_progress()); fib(44); # This one blocks for a few seconds before it starts.

Progress:  0 	 Time: 0:00:10

[MarcMush]

I don't think that's a problem with ProgressMeter, I see the same behavior with println(i)

function show_progress()
    for i in 1:10
        println(i)
        sleep(1)
    end
end