Gurobi 5.0.1 (linux64) logging started Fri Nov 16 16:33:18 2012 Optimize a model with 12628 rows, 6006 columns and 43582 nonzeros Presolve removed 1618 rows and 77 columns Presolve time: 0.27s Presolved: 11010 rows, 5929 columns, 39732 nonzeros Variable types: 0 continuous, 5929 integer (5929 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 3.000000e+00, 8400 iterations, 1.31 seconds Total elapsed time = 5.84s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 138 43.00000 3.00000 93.0% - 7s H 0 0 5.0000000 3.00000 40.0% - 7s 0 0 3.00000 0 231 5.00000 3.00000 40.0% - 9s H 0 0 4.0000000 3.00000 25.0% - 9s 0 0 3.00000 0 188 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 172 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 141 4.00000 3.00000 25.0% - 24s 0 0 3.00000 0 74 4.00000 3.00000 25.0% - 27s 0 0 3.00000 0 107 4.00000 3.00000 25.0% - 31s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 38s 0 0 3.00000 0 136 4.00000 3.00000 25.0% - 40s 0 0 3.00000 0 145 4.00000 3.00000 25.0% - 45s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 51s 0 0 3.00000 0 146 4.00000 3.00000 25.0% - 54s 0 0 3.00000 0 146 4.00000 3.00000 25.0% - 56s 0 2 3.00000 0 146 4.00000 3.00000 25.0% - 61s 4 4 3.00000 1 129 4.00000 3.00000 25.0% 3307 68s 5 5 3.00000 1 175 4.00000 3.00000 25.0% 2646 78s 6 6 3.00000 1 133 4.00000 3.00000 25.0% 2205 84s 7 6 3.00000 1 66 4.00000 3.00000 25.0% 1890 91s 8 7 3.00000 1 103 4.00000 3.00000 25.0% 1654 99s 9 8 3.00000 1 78 4.00000 3.00000 25.0% 1470 104s 10 8 3.00000 1 114 4.00000 3.00000 25.0% 1323 109s 11 9 3.00000 1 66 4.00000 3.00000 25.0% 1203 116s 12 10 3.00000 1 257 4.00000 3.00000 25.0% 1102 127s 13 10 3.00000 1 80 4.00000 3.00000 25.0% 1018 136s 14 11 3.00000 1 91 4.00000 3.00000 25.0% 945 144s 15 12 3.00000 1 91 4.00000 3.00000 25.0% 882 145s Cutting planes: Gomory: 7 Zero half: 1 Explored 19 nodes (652591 simplex iterations) in 147.43 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%