Comment by npalli

Is the recursive sum the best function to show multi-threading or GPU speedups? Seems unlikely. FWIW, i ported the python example to Julia and it ran in about 2.5 seconds the same as the C++ version. Pure python 3.12 took 183 seconds.

  function sum(depth, x)
      if depth == 0
          return x
      else
          fst = sum(depth-1, x*2+0)
          snd = sum(depth-1, x*2+1)
      end
      return fst + snd
  end

println(sum(30,0))