Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:59:30 2013 Optimize a model with 1200 rows, 28550 columns and 66550 nonzeros Presolve removed 50 rows and 1250 columns Presolve time: 0.15s Presolved: 1150 rows, 27300 columns, 64550 nonzeros Variable types: 27050 continuous, 250 integer (250 binary) Root relaxation: objective 1.749223e+05, 2165 iterations, 0.10 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 174922.321 0 6 - 174922.321 - - 0s 0 0 174945.532 0 6 - 174945.532 - - 0s 0 0 174952.263 0 6 - 174952.263 - - 0s 0 0 174958.505 0 6 - 174958.505 - - 0s 0 0 174958.505 0 6 - 174958.505 - - 0s 0 0 174958.505 0 6 - 174958.505 - - 0s 0 0 174958.505 0 6 - 174958.505 - - 0s 0 0 174958.505 0 6 - 174958.505 - - 1s H 0 0 178511.00724 174958.505 1.99% - 1s 0 2 174959.315 0 6 178511.007 174959.315 1.99% - 1s H 27 17 177163.37382 175072.609 1.18% 25.3 2s * 52 33 52 176781.75957 175072.609 0.97% 17.7 2s * 72 38 12 176668.05397 175097.603 0.89% 24.2 2s H 82 37 176524.08613 175097.603 0.81% 23.4 3s H 109 39 176443.96055 175266.204 0.67% 22.9 3s * 243 42 23 176230.44114 175813.345 0.24% 20.6 4s H 272 23 176208.61401 175955.693 0.14% 20.5 4s Cutting planes: Flow cover: 9 Explored 304 nodes (8993 simplex iterations) in 4.83 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.762086140087e+05, best bound 1.761945875374e+05, gap 0.0080%