Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:25:46 2012 Optimize a model with 12138 rows, 3782 columns and 39892 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.32s Presolved: 12197 rows, 3780 columns, 43215 nonzeros Variable types: 0 continuous, 3780 integer (3780 binary) Found heuristic solution: objective 59.0000000 Root relaxation: objective 2.000000e+00, 2751 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 122 59.00000 2.00000 96.6% - 0s H 0 0 58.0000000 2.00000 96.6% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 857 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 1959 5.00000 2.66667 46.7% - 3s 0 0 2.66667 0 154 5.00000 2.66667 46.7% - 6s 0 0 2.67045 0 3024 5.00000 2.67045 46.6% - 8s 0 0 2.67045 0 3155 5.00000 2.67045 46.6% - 9s 0 0 2.67045 0 3139 5.00000 2.67045 46.6% - 11s 0 0 2.67045 0 3124 5.00000 2.67045 46.6% - 13s 0 0 2.67045 0 2988 5.00000 2.67045 46.6% - 16s 0 0 2.67045 0 3103 5.00000 2.67045 46.6% - 17s 0 0 2.67045 0 3159 5.00000 2.67045 46.6% - 19s 0 0 2.67045 0 3109 5.00000 2.67045 46.6% - 21s 0 0 2.67045 0 3025 5.00000 2.67045 46.6% - 23s 0 0 2.67045 0 3150 5.00000 2.67045 46.6% - 25s 0 0 2.67045 0 3024 5.00000 2.67045 46.6% - 27s 0 0 2.67045 0 3084 5.00000 2.67045 46.6% - 29s 0 0 2.67045 0 3063 5.00000 2.67045 46.6% - 30s 0 2 2.80000 0 3063 5.00000 2.80000 44.0% - 39s 9 3 4.00000 2 90 5.00000 3.00000 40.0% 988 40s * 26 4 15 4.0000000 3.00000 25.0% 478 41s Cutting planes: Clique: 75 Zero half: 6 Explored 31 nodes (94966 simplex iterations) in 42.90 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%