collect   monitor  % diff
  1            0.9279094862417618            0.9816211903108965           -0.6350154728913245            0.0023094740936360            0.0023799786872868
  4            1.0116406568410963            0.9932989875911395           -0.6316714659295510            0.0029308509706413            0.0027776202679913
  0            0.9035479843271756
  3            2.1927397972867735