Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:48:24 2012 Optimize a model with 8064 rows, 3192 columns and 27160 nonzeros Presolve removed 1737 rows and 56 columns Presolve time: 0.16s Presolved: 6327 rows, 3136 columns, 23072 nonzeros Variable types: 0 continuous, 3136 integer (3136 binary) Found heuristic solution: objective 36.0000000 Root relaxation: objective 3.000000e+00, 5801 iterations, 0.70 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 66 36.00000 3.00000 91.7% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s 0 0 3.00000 0 277 5.00000 3.00000 40.0% - 3s 0 0 3.00000 0 137 5.00000 3.00000 40.0% - 7s H 0 0 4.0000000 3.00000 25.0% - 7s 0 0 3.00000 0 158 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 163 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 158 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 170 4.00000 3.00000 25.0% - 21s 0 0 3.00000 0 170 4.00000 3.00000 25.0% - 22s 0 2 3.00000 0 170 4.00000 3.00000 25.0% - 26s 4 4 3.00000 1 113 4.00000 3.00000 25.0% 1534 31s 6 6 3.00000 1 64 4.00000 3.00000 25.0% 1023 37s 7 6 3.00000 1 132 4.00000 3.00000 25.0% 877 41s 8 7 3.00000 1 124 4.00000 3.00000 25.0% 767 45s 9 8 3.00000 1 164 4.00000 3.00000 25.0% 682 53s 10 8 3.00000 1 150 4.00000 3.00000 25.0% 614 56s 13 10 3.00000 14 110 4.00000 3.00000 25.0% 8934 61s 15 12 3.00000 15 121 4.00000 3.00000 25.0% 7840 67s 17 13 3.00000 16 119 4.00000 3.00000 25.0% 7099 72s Cutting planes: Gomory: 3 Zero half: 5 Explored 24 nodes (236122 simplex iterations) in 73.18 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%