Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:28 2012 Optimize a model with 540 rows, 146 columns and 1080 nonzeros Presolve removed 82 rows and 0 columns Presolve time: 0.00s Presolved: 458 rows, 146 columns, 970 nonzeros Variable types: 0 continuous, 146 integer (146 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.266667e+01, 241 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 62.66667 0 131 47.00000 62.66667 33.3% - 0s 0 0 61.50000 0 121 47.00000 61.50000 30.9% - 0s 0 0 60.50000 0 139 47.00000 60.50000 28.7% - 0s H 0 0 48.0000000 60.50000 26.0% - 0s 0 0 60.12500 0 139 48.00000 60.12500 25.3% - 0s 0 0 59.64966 0 146 48.00000 59.64966 24.3% - 0s 0 0 58.64015 0 145 48.00000 58.64015 22.2% - 0s H 0 0 50.0000000 58.64015 17.3% - 0s 0 0 58.29461 0 146 50.00000 58.29461 16.6% - 0s 0 0 57.96702 0 145 50.00000 57.96702 15.9% - 0s 0 0 57.76143 0 146 50.00000 57.76143 15.5% - 0s 0 0 57.58102 0 145 50.00000 57.58102 15.2% - 0s 0 0 57.50400 0 143 50.00000 57.50400 15.0% - 0s 0 0 57.44905 0 144 50.00000 57.44905 14.9% - 0s 0 0 57.44905 0 144 50.00000 57.44905 14.9% - 0s H 0 0 53.0000000 57.44905 8.39% - 0s 0 2 57.44666 0 144 53.00000 57.44666 8.39% - 0s Cutting planes: Gomory: 2 Zero half: 188 Explored 248 nodes (11654 simplex iterations) in 0.49 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%