Gurobi 5.0.1 (linux64) logging started Fri Nov 16 16:49:11 2012 Optimize a model with 13667 rows, 6320 columns and 47005 nonzeros Presolve removed 1896 rows and 0 columns Presolve time: 0.30s Presolved: 11771 rows, 6320 columns, 42581 nonzeros Variable types: 0 continuous, 6320 integer (6320 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 11399 iterations, 2.47 seconds Total elapsed time = 5.16s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 133 52.00000 3.00000 94.2% - 7s H 0 0 4.0000000 3.00000 25.0% - 7s 0 0 3.00000 0 394 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 152 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 123 4.00000 3.00000 25.0% - 22s 0 0 3.00000 0 158 4.00000 3.00000 25.0% - 25s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 32s 0 0 3.00000 0 162 4.00000 3.00000 25.0% - 43s 0 0 3.00000 0 220 4.00000 3.00000 25.0% - 52s 0 0 3.00000 0 135 4.00000 3.00000 25.0% - 55s 0 2 3.00000 0 135 4.00000 3.00000 25.0% - 59s 2 3 3.00000 1 135 4.00000 3.00000 25.0% 4694 62s 4 4 3.00000 1 119 4.00000 3.00000 25.0% 2347 69s 5 5 3.00000 1 123 4.00000 3.00000 25.0% 1878 71s 7 6 3.00000 1 107 4.00000 3.00000 25.0% 1341 77s 8 7 3.00000 1 176 4.00000 3.00000 25.0% 1174 87s 11 9 infeasible 13 4.00000 3.00000 25.0% 11136 90s 14 11 3.00000 14 114 4.00000 3.00000 25.0% 8903 95s 19 6 infeasible 16 4.00000 3.00000 25.0% 7604 100s Cutting planes: Gomory: 2 Zero half: 3 Explored 23 nodes (399784 simplex iterations) in 101.99 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%