Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:10 2012 Optimize a model with 498 rows, 137 columns and 996 nonzeros Presolve removed 89 rows and 0 columns Presolve time: 0.00s Presolved: 409 rows, 137 columns, 872 nonzeros Variable types: 0 continuous, 137 integer (137 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.700000e+01, 218 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 57.00000 0 114 46.00000 57.00000 23.9% - 0s 0 0 56.33333 0 125 46.00000 56.33333 22.5% - 0s H 0 0 50.0000000 56.33333 12.7% - 0s 0 0 55.66667 0 132 50.00000 55.66667 11.3% - 0s 0 0 54.86036 0 136 50.00000 54.86036 9.72% - 0s 0 0 54.50000 0 137 50.00000 54.50000 9.00% - 0s H 0 0 51.0000000 54.50000 6.86% - 0s 0 0 54.50000 0 136 51.00000 54.50000 6.86% - 0s 0 0 54.50000 0 136 51.00000 54.50000 6.86% - 0s 0 0 54.50000 0 133 51.00000 54.50000 6.86% - 0s 0 0 54.39292 0 135 51.00000 54.39292 6.65% - 0s 0 0 54.27019 0 132 51.00000 54.27019 6.41% - 0s 0 0 54.17453 0 135 51.00000 54.17453 6.22% - 0s 0 0 54.13084 0 136 51.00000 54.13084 6.14% - 0s 0 0 54.10199 0 136 51.00000 54.10199 6.08% - 0s 0 0 54.07404 0 135 51.00000 54.07404 6.03% - 0s 0 0 54.05892 0 135 51.00000 54.05892 6.00% - 0s 0 0 54.05892 0 133 51.00000 54.05892 6.00% - 0s 0 2 54.05532 0 132 51.00000 54.05532 5.99% - 0s Cutting planes: Zero half: 108 Explored 65 nodes (3444 simplex iterations) in 0.20 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%