Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:14 2012 Optimize a model with 501 rows, 145 columns and 1002 nonzeros Presolve removed 92 rows and 0 columns Presolve time: 0.00s Presolved: 409 rows, 145 columns, 873 nonzeros Variable types: 0 continuous, 145 integer (145 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 6.100000e+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 61.00000 0 129 44.00000 61.00000 38.6% - 0s H 0 0 46.0000000 61.00000 32.6% - 0s 0 0 60.40000 0 127 46.00000 60.40000 31.3% - 0s H 0 0 47.0000000 60.40000 28.5% - 0s 0 0 59.88462 0 144 47.00000 59.88462 27.4% - 0s 0 0 59.00000 0 136 47.00000 59.00000 25.5% - 0s 0 0 58.83333 0 130 47.00000 58.83333 25.2% - 0s H 0 0 48.0000000 58.83333 22.6% - 0s 0 0 58.70588 0 140 48.00000 58.70588 22.3% - 0s 0 0 58.41429 0 143 48.00000 58.41429 21.7% - 0s 0 0 58.32138 0 144 48.00000 58.32138 21.5% - 0s H 0 0 49.0000000 58.32138 19.0% - 0s 0 0 58.11573 0 142 49.00000 58.11573 18.6% - 0s 0 0 58.07601 0 144 49.00000 58.07601 18.5% - 0s 0 0 57.90878 0 143 49.00000 57.90878 18.2% - 0s H 0 0 50.0000000 57.90878 15.8% - 0s 0 0 57.81526 0 143 50.00000 57.81526 15.6% - 0s 0 0 57.73167 0 144 50.00000 57.73167 15.5% - 0s 0 0 57.61416 0 143 50.00000 57.61416 15.2% - 0s 0 0 57.54944 0 143 50.00000 57.54944 15.1% - 0s 0 0 57.53973 0 144 50.00000 57.53973 15.1% - 0s 0 0 57.53973 0 143 50.00000 57.53973 15.1% - 0s 0 2 57.53904 0 143 50.00000 57.53904 15.1% - 0s H 9 9 52.0000000 57.53706 10.6% 54.7 0s * 11 11 8 53.0000000 57.53706 8.56% 48.6 0s Cutting planes: Gomory: 2 Zero half: 119 Explored 295 nodes (10235 simplex iterations) in 0.44 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%