collect   monitor  % diff
  1            6.4483658428511763            6.3256473960936308            0.1827176023179859            0.0195964140096611            0.0198145047249807
  4            9.2955768021112046            9.4441765131420201            0.1759278052622958            0.0234004970263406            0.0238775045233410
  0            2.3943263682666482
  3            3.3942296300005101