Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:30:30 2012 Optimize a model with 6448 rows, 2756 columns and 21892 nonzeros Presolve removed 1353 rows and 52 columns Presolve time: 0.13s Presolved: 5095 rows, 2704 columns, 18668 nonzeros Variable types: 0 continuous, 2704 integer (2704 binary) Found heuristic solution: objective 29.0000000 Root relaxation: objective 3.000000e+00, 4426 iterations, 0.36 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 58 29.00000 3.00000 89.7% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 103 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 94 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 12s 0 2 3.00000 0 96 4.00000 3.00000 25.0% - 15s 6 6 3.00000 1 123 4.00000 3.00000 25.0% 786 22s 7 6 3.00000 1 121 4.00000 3.00000 25.0% 674 25s 9 8 3.00000 1 112 4.00000 3.00000 25.0% 524 30s 11 9 3.00000 1 152 4.00000 3.00000 25.0% 429 38s 12 10 3.00000 1 119 4.00000 3.00000 25.0% 393 40s 16 12 3.00000 11 78 4.00000 3.00000 25.0% 8330 46s Cutting planes: Gomory: 7 Zero half: 10 Explored 20 nodes (223594 simplex iterations) in 46.50 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%