Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:18:53 2012 Optimize a model with 6299 rows, 2550 columns and 21198 nonzeros Presolve removed 1702 rows and 2 columns Presolve time: 0.15s Presolved: 4597 rows, 2548 columns, 16964 nonzeros Variable types: 0 continuous, 2548 integer (2548 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 3.000000e+00, 5014 iterations, 0.71 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 137 50.00000 3.00000 94.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 111 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 124 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 119 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 94 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 86 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 21s 0 2 3.00000 0 92 4.00000 3.00000 25.0% - 24s 2 3 3.00000 1 92 4.00000 3.00000 25.0% 3378 26s 5 5 3.00000 1 94 4.00000 3.00000 25.0% 1351 31s 6 6 3.00000 1 85 4.00000 3.00000 25.0% 1126 35s 8 7 3.00000 1 117 4.00000 3.00000 25.0% 844 40s 9 8 3.00000 1 117 4.00000 3.00000 25.0% 751 46s 12 12 3.00000 14 1418 4.00000 3.00000 25.0% 7768 86s Cutting planes: Gomory: 17 Zero half: 21 Explored 20 nodes (208588 simplex iterations) in 88.05 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%