Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:09:14 2012 Optimize a model with 7182 rows, 2970 columns and 24300 nonzeros Presolve removed 1459 rows and 54 columns Presolve time: 0.13s Presolved: 5723 rows, 2916 columns, 20844 nonzeros Variable types: 0 continuous, 2916 integer (2916 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.000000e+00, 5482 iterations, 0.62 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 78 27.00000 3.00000 88.9% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 144 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 155 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 157 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 156 4.00000 3.00000 25.0% - 20s 0 2 3.00000 0 156 4.00000 3.00000 25.0% - 22s 4 4 3.00000 1 80 4.00000 3.00000 25.0% 866 25s 6 6 3.00000 1 182 4.00000 3.00000 25.0% 578 34s 7 6 3.00000 1 102 4.00000 3.00000 25.0% 495 36s 10 8 3.00000 16 116 4.00000 3.00000 25.0% 5991 40s 14 7 3.00000 18 82 4.00000 3.00000 25.0% 4383 45s Cutting planes: Gomory: 3 Clique: 1 Zero half: 10 Explored 17 nodes (170795 simplex iterations) in 45.59 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%