Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:04:23 2012 Optimize a model with 11639 rows, 3660 columns and 38278 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.30s Presolved: 11697 rows, 3658 columns, 41490 nonzeros Variable types: 0 continuous, 3658 integer (3658 binary) Found heuristic solution: objective 60.0000000 Root relaxation: objective 2.000000e+00, 2762 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 0 120 60.00000 2.00000 96.7% - 0s H 0 0 57.0000000 2.00000 96.5% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 547 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 3226 5.00000 2.66667 46.7% - 1s H 0 0 4.0000000 2.66667 33.3% - 2s 0 0 2.66667 0 379 4.00000 2.66667 33.3% - 5s 0 0 2.68639 0 2775 4.00000 2.68639 32.8% - 7s 0 0 2.68639 0 2860 4.00000 2.68639 32.8% - 7s 0 0 2.68639 0 2856 4.00000 2.68639 32.8% - 9s 0 0 2.68639 0 2841 4.00000 2.68639 32.8% - 12s 0 0 2.68639 0 2779 4.00000 2.68639 32.8% - 13s 0 0 2.68639 0 2766 4.00000 2.68639 32.8% - 15s 0 0 2.68639 0 2783 4.00000 2.68639 32.8% - 16s 0 0 2.68639 0 2813 4.00000 2.68639 32.8% - 18s 0 0 2.68639 0 2825 4.00000 2.68639 32.8% - 20s 0 0 2.68639 0 2825 4.00000 2.68639 32.8% - 20s 0 1 3.00000 0 2825 4.00000 3.00000 25.0% - 25s Cutting planes: Clique: 199 Zero half: 6 Explored 6 nodes (61506 simplex iterations) in 25.78 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%