Hartmann's 3-D function, evaluations of 10 to 50 ms, 4 at a time: global minimum -3.862782
asynchronous: 0.38 s, 46 evaluations, 120.1 evaluations/s, best -3.862781, 7.1e-7 above the minimum
  in batches: 0.78 s, 60 evaluations, 76.7 evaluations/s, best -3.862782, 4.1e-7 above the minimum
