Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:01:50 2012 Optimize a model with 8493 rows, 3306 columns and 28557 nonzeros Presolve removed 1710 rows and 0 columns Presolve time: 0.16s Presolved: 6783 rows, 3306 columns, 24510 nonzeros Variable types: 0 continuous, 3306 integer (3306 binary) Found heuristic solution: objective 34.0000000 Root relaxation: objective 3.000000e+00, 6633 iterations, 1.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 119 34.00000 3.00000 91.2% - 4s H 0 0 4.0000000 3.00000 25.0% - 4s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 169 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 173 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 115 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 175 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 181 4.00000 3.00000 25.0% - 22s 0 0 3.00000 0 181 4.00000 3.00000 25.0% - 23s 0 2 3.00000 0 180 4.00000 3.00000 25.0% - 26s 4 4 3.00000 1 125 4.00000 3.00000 25.0% 1323 30s 6 6 3.00000 1 139 4.00000 3.00000 25.0% 882 39s 7 6 3.00000 1 130 4.00000 3.00000 25.0% 756 44s 8 7 3.00000 1 108 4.00000 3.00000 25.0% 661 48s 9 8 3.00000 1 121 4.00000 3.00000 25.0% 588 54s 10 8 3.00000 1 165 4.00000 3.00000 25.0% 529 57s 11 9 3.00000 1 117 4.00000 3.00000 25.0% 481 62s 12 10 3.00000 1 133 4.00000 3.00000 25.0% 441 66s 13 10 3.00000 1 167 4.00000 3.00000 25.0% 407 74s 14 11 3.00000 1 155 4.00000 3.00000 25.0% 378 77s 16 12 infeasible 10 4.00000 3.00000 25.0% 12648 82s 17 13 3.00000 10 143 4.00000 3.00000 25.0% 11959 85s 20 13 3.00000 12 106 4.00000 3.00000 25.0% 10242 91s Cutting planes: Gomory: 2 Zero half: 19 Explored 24 nodes (320809 simplex iterations) in 92.17 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%