Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:23:22 2013 Optimize a model with 51191 rows, 50481 columns and 201711 nonzeros Presolve removed 2363 rows and 0 columns Presolve time: 0.31s Presolved: 48828 rows, 50481 columns, 196985 nonzeros Variable types: 50410 continuous, 71 integer (71 binary) Root relaxation: objective 8.675616e+04, 9382 iterations, 1.64 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 86756.1628 0 4 - 86756.1628 - - 2s H 0 0 91062.000000 86756.1628 4.73% - 2s 0 0 86761.8125 0 6 91062.0000 86761.8125 4.72% - 2s H 0 0 90547.000000 86761.8125 4.18% - 2s H 0 0 90204.000000 86761.8125 3.82% - 3s 0 0 86762.2848 0 6 90204.0000 86762.2848 3.82% - 3s 0 0 86762.3508 0 6 90204.0000 86762.3508 3.82% - 3s 0 2 86764.7179 0 6 90204.0000 86764.7179 3.81% - 5s H 5 5 89588.515734 86835.0731 3.07% 159 6s H 6 6 88322.968254 86835.0731 1.68% 146 6s H 9 9 87602.000000 86835.0731 0.88% 128 6s * 22 11 22 87402.000000 86835.0731 0.65% 102 7s * 37 16 14 87387.000000 86936.8092 0.52% 111 9s 51 26 87182.2388 13 1 87387.0000 86989.5714 0.45% 114 10s * 55 21 15 87322.000000 86989.5714 0.38% 108 10s * 64 24 12 87300.000000 86992.6757 0.35% 111 10s * 70 1 10 87099.000000 87069.0786 0.03% 110 10s Cutting planes: Gomory: 2 Flow cover: 11 Explored 72 nodes (17375 simplex iterations) in 11.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.709900000000e+04, best bound 8.709900000000e+04, gap 0.0%