Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:41:48 2012 Optimize a model with 4994 rows, 2070 columns and 16828 nonzeros Presolve removed 1442 rows and 2 columns Presolve time: 0.12s Presolved: 3597 rows, 2068 columns, 15275 nonzeros Variable types: 0 continuous, 2068 integer (2068 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 3.000000e+00, 3329 iterations, 0.31 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 282 45.00000 3.00000 93.3% - 1s H 0 0 18.0000000 3.00000 83.3% - 1s H 0 0 10.0000000 3.00000 70.0% - 1s 0 0 3.00000 0 531 10.00000 3.00000 70.0% - 1s H 0 0 9.0000000 3.00000 66.7% - 1s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 71 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 6s 0 2 3.00000 0 104 4.00000 3.00000 25.0% - 7s 4 4 3.00000 1 89 4.00000 3.00000 25.0% 336 10s 8 7 3.00000 1 66 4.00000 3.00000 25.0% 168 15s 12 11 3.00000 13 58 4.00000 3.00000 25.0% 4219 20s Cutting planes: Gomory: 2 Zero half: 13 Explored 15 nodes (89787 simplex iterations) in 20.72 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%