Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:11 2012 Optimize a model with 510 rows, 144 columns and 1020 nonzeros Presolve removed 107 rows and 2 columns Presolve time: 0.00s Presolved: 403 rows, 142 columns, 866 nonzeros Variable types: 0 continuous, 142 integer (142 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.040000e+01, 256 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.40000 0 131 47.00000 60.40000 28.5% - 0s H 0 0 53.0000000 60.40000 14.0% - 0s 0 0 60.00000 0 135 53.00000 60.00000 13.2% - 0s 0 0 59.46388 0 139 53.00000 59.46388 12.2% - 0s H 0 0 54.0000000 59.46388 10.1% - 0s 0 0 58.93829 0 140 54.00000 58.93829 9.14% - 0s 0 0 58.47771 0 139 54.00000 58.47771 8.29% - 0s 0 0 58.24409 0 140 54.00000 58.24409 7.86% - 0s 0 0 57.83165 0 140 54.00000 57.83165 7.10% - 0s 0 0 57.54762 0 137 54.00000 57.54762 6.57% - 0s 0 0 57.43333 0 141 54.00000 57.43333 6.36% - 0s 0 0 57.31959 0 140 54.00000 57.31959 6.15% - 0s 0 0 57.25000 0 139 54.00000 57.25000 6.02% - 0s 0 0 57.17345 0 140 54.00000 57.17345 5.88% - 0s 0 0 57.13248 0 136 54.00000 57.13248 5.80% - 0s 0 0 57.13116 0 138 54.00000 57.13116 5.80% - 0s 0 0 57.13116 0 134 54.00000 57.13116 5.80% - 0s 0 2 57.12269 0 134 54.00000 57.12269 5.78% - 0s Cutting planes: Zero half: 85 Explored 61 nodes (3287 simplex iterations) in 0.19 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%