Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:37:30 2012 Optimize a model with 6915 rows, 2756 columns and 23242 nonzeros Presolve removed 1146 rows and 2 columns Presolve time: 0.19s Presolved: 5769 rows, 2754 columns, 20212 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4108 iterations, 0.54 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 990 52.00000 3.00000 94.2% - 1s H 0 0 51.0000000 3.00000 94.1% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 279 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 140 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 101 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 123 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 115 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 153 4.00000 3.00000 25.0% - 23s 0 0 3.00000 0 153 4.00000 3.00000 25.0% - 24s 0 2 3.00000 0 153 4.00000 3.00000 25.0% - 26s 4 4 3.00000 1 52 4.00000 3.00000 25.0% 690 31s Cutting planes: Gomory: 5 Clique: 5 Zero half: 21 Explored 21 nodes (147336 simplex iterations) in 34.03 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%