Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:55:08 2012 Optimize a model with 711 rows, 167 columns and 1422 nonzeros Presolve removed 137 rows and 0 columns Presolve time: 0.00s Presolved: 574 rows, 167 columns, 1239 nonzeros Variable types: 0 continuous, 167 integer (167 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.700000e+01, 308 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.00000 0 130 50.00000 67.00000 34.0% - 0s 0 0 66.24627 0 163 50.00000 66.24627 32.5% - 0s H 0 0 52.0000000 66.24627 27.4% - 0s 0 0 64.98425 0 164 52.00000 64.98425 25.0% - 0s 0 0 64.15544 0 164 52.00000 64.15544 23.4% - 0s 0 0 63.89792 0 164 52.00000 63.89792 22.9% - 0s 0 0 63.49256 0 165 52.00000 63.49256 22.1% - 0s 0 0 63.39725 0 165 52.00000 63.39725 21.9% - 0s 0 0 63.35113 0 166 52.00000 63.35113 21.8% - 0s 0 0 63.12185 0 165 52.00000 63.12185 21.4% - 0s 0 0 63.09911 0 166 52.00000 63.09911 21.3% - 0s 0 0 63.09911 0 166 52.00000 63.09911 21.3% - 0s H 0 0 55.0000000 63.09911 14.7% - 0s 0 2 63.09389 0 165 55.00000 63.09389 14.7% - 0s 613 232 60.54535 6 164 55.00000 60.68032 10.3% 39.7 5s 888 310 59.33333 15 136 55.00000 60.68032 10.3% 47.7 10s 3284 653 56.55556 27 116 55.00000 58.05882 5.56% 37.2 15s Cutting planes: Gomory: 2 Zero half: 192 Explored 5319 nodes (177970 simplex iterations) in 17.99 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%