Gurobi 5.0.1 (linux64) logging started Mon Feb 4 19:00:16 2013 Optimize a model with 43744 rows, 4096 columns and 133120 nonzeros Presolve removed 3566 rows and 2073 columns Presolve time: 0.32s Presolved: 40178 rows, 2023 columns, 122483 nonzeros Variable types: 32 continuous, 1991 integer (1991 binary) Found heuristic solution: objective 77947.000000 Root relaxation: objective 5.783072e+04, 22532 iterations, 2.18 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 57830.7167 0 11 77947.0000 57830.7167 25.8% - 2s H 0 0 57849.000000 57830.7167 0.03% - 2s H 0 0 57841.000000 57830.7167 0.02% - 2s 0 0 57831.7728 0 26 57841.0000 57831.7728 0.02% - 3s 0 0 57831.7728 0 11 57841.0000 57831.7728 0.02% - 3s 0 0 57831.7747 0 27 57841.0000 57831.7747 0.02% - 3s 0 2 57832.0868 0 25 57841.0000 57832.0868 0.02% - 3s H 1 2 57839.000000 57832.0868 0.01% 34.0 3s Cutting planes: Gomory: 3 Implied bound: 1 MIR: 18 Zero half: 3 Explored 19 nodes (26642 simplex iterations) in 3.64 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.783900000000e+04, best bound 5.783400000000e+04, gap 0.0086%