Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:36:04 2013 Optimize a model with 37881 rows, 37271 columns and 148901 nonzeros Presolve removed 2317 rows and 0 columns Presolve time: 0.22s Presolved: 35564 rows, 37271 columns, 144267 nonzeros Variable types: 37210 continuous, 61 integer (61 binary) Root relaxation: objective 8.203074e+04, 8112 iterations, 0.94 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 82030.7426 0 2 - 82030.7426 - - 1s H 0 0 82883.000000 82030.7426 1.03% - 1s H 0 0 82195.000000 82030.7426 0.20% - 1s 0 0 82031.9585 0 3 82195.0000 82031.9585 0.20% - 1s 0 0 82031.9941 0 3 82195.0000 82031.9941 0.20% - 1s 0 0 82031.9941 0 2 82195.0000 82031.9941 0.20% - 3s 0 0 82033.8786 0 3 82195.0000 82033.8786 0.20% - 3s 0 0 82033.9294 0 3 82195.0000 82033.9294 0.20% - 3s 0 2 82046.6409 0 3 82195.0000 82046.6409 0.18% - 3s * 3 3 2 82177.000000 82143.2162 0.04% 137 3s * 6 1 3 82176.000000 82155.1081 0.03% 78.7 3s Cutting planes: Gomory: 2 Flow cover: 4 Explored 8 nodes (11170 simplex iterations) in 3.78 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.217600000000e+04, best bound 8.217600000000e+04, gap 0.0%