Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:39:04 2012 Optimize a model with 4994 rows, 2070 columns and 16828 nonzeros Presolve removed 1442 rows and 2 columns Presolve time: 0.12s Presolved: 3552 rows, 2068 columns, 13250 nonzeros Variable types: 0 continuous, 2068 integer (2068 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 3.000000e+00, 3638 iterations, 0.39 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 65 45.00000 3.00000 93.3% - 2s H 0 0 15.0000000 3.00000 80.0% - 2s H 0 0 12.0000000 3.00000 75.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 188 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 84 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 194 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 54 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 78 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 149 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 87 4.00000 3.00000 25.0% - 9s 0 2 3.00000 0 87 4.00000 3.00000 25.0% - 10s 5 5 3.00000 1 101 4.00000 3.00000 25.0% 413 15s 8 7 3.00000 1 104 4.00000 3.00000 25.0% 258 20s 10 8 3.00000 1 108 4.00000 3.00000 25.0% 207 25s 14 13 3.00000 13 70 4.00000 3.00000 25.0% 5497 31s Cutting planes: Gomory: 6 Clique: 1 Zero half: 16 Explored 19 nodes (141641 simplex iterations) in 31.54 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%