Gurobi 5.0.1 (linux64) logging started Fri Nov 16 16:35:48 2012 Optimize a model with 12859 rows, 6006 columns and 44275 nonzeros Presolve removed 1389 rows and 231 columns Presolve time: 0.28s Presolved: 11470 rows, 5775 columns, 40733 nonzeros Variable types: 0 continuous, 5775 integer (5775 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 3.000000e+00, 11871 iterations, 1.82 seconds Total elapsed time = 5.18s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 91 48.00000 3.00000 93.8% - 6s H 0 0 4.0000000 3.00000 25.0% - 6s 0 0 3.00000 0 232 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 119 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 113 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 136 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 27s 0 0 3.00000 0 189 4.00000 3.00000 25.0% - 35s 0 0 3.00000 0 221 4.00000 3.00000 25.0% - 46s 0 0 3.00000 0 147 4.00000 3.00000 25.0% - 50s 0 2 3.00000 0 147 4.00000 3.00000 25.0% - 54s 2 3 3.00000 1 147 4.00000 3.00000 25.0% 4992 56s 4 4 3.00000 1 112 4.00000 3.00000 25.0% 2496 63s 5 5 3.00000 1 80 4.00000 3.00000 25.0% 1997 65s 8 7 3.00000 1 120 4.00000 3.00000 25.0% 1248 74s 9 8 3.00000 1 111 4.00000 3.00000 25.0% 1109 76s 11 9 3.00000 1 127 4.00000 3.00000 25.0% 908 83s 12 10 3.00000 1 99 4.00000 3.00000 25.0% 832 85s 14 11 3.00000 1 133 4.00000 3.00000 25.0% 713 91s 18 14 3.00000 12 124 4.00000 3.00000 25.0% 11099 95s 25 12 3.00000 14 102 4.00000 3.00000 25.0% 8405 100s Cutting planes: Gomory: 5 Zero half: 32 Explored 35 nodes (486173 simplex iterations) in 103.99 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%