Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:46:32 2012 Optimize a model with 4967 rows, 2162 columns and 16834 nonzeros Presolve removed 1015 rows and 48 columns Presolve time: 0.11s Presolved: 3952 rows, 2114 columns, 14270 nonzeros Variable types: 0 continuous, 2114 integer (2114 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 3.000000e+00, 3554 iterations, 0.35 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 81 46.00000 3.00000 93.5% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 84 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 80 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 155 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 134 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 132 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 128 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 155 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 13s 0 2 3.00000 0 127 4.00000 3.00000 25.0% - 14s 2 3 3.00000 1 127 4.00000 3.00000 25.0% 1016 15s 6 6 3.00000 1 80 4.00000 3.00000 25.0% 339 20s 10 8 3.00000 1 103 4.00000 3.00000 25.0% 203 26s 13 12 3.00000 11 64 4.00000 3.00000 25.0% 5187 30s Cutting planes: Gomory: 2 Zero half: 7 Explored 19 nodes (154581 simplex iterations) in 31.69 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%