collect   monitor  % diff
  1            2.0369663183400548            2.0665426741061950           -0.5991457207025901            0.0061121060063847            0.0061587088543870
  4            1.4386088077385806            1.4531376414020643           -0.6192242170923368            0.0046498136763783            0.0045850142784307
  0            1.8957069110571849
  3            2.2537398757461835