Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:59:20 2012 Optimize a model with 6048 rows, 2352 columns and 20304 nonzeros Presolve removed 1536 rows and 0 columns Presolve time: 0.13s Presolved: 4512 rows, 2352 columns, 16800 nonzeros Variable types: 0 continuous, 2352 integer (2352 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.000000e+00, 4881 iterations, 0.48 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 52 31.00000 3.00000 90.3% - 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 0 165 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 50 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 77 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 130 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 9s 0 2 3.00000 0 137 4.00000 3.00000 25.0% - 11s 5 5 3.00000 1 103 4.00000 3.00000 25.0% 536 17s 7 6 3.00000 1 124 4.00000 3.00000 25.0% 383 20s 9 8 3.00000 1 119 4.00000 3.00000 25.0% 298 25s 11 9 3.00000 1 111 4.00000 3.00000 25.0% 243 30s 13 10 3.00000 1 106 4.00000 3.00000 25.0% 206 36s Cutting planes: Gomory: 1 Zero half: 10 Explored 18 nodes (174072 simplex iterations) in 37.75 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%