Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:08 2012 Optimize a model with 558 rows, 144 columns and 1116 nonzeros Presolve removed 121 rows and 0 columns Presolve time: 0.01s Presolved: 437 rows, 144 columns, 961 nonzeros Variable types: 0 continuous, 144 integer (144 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.050000e+01, 250 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.50000 0 111 47.00000 60.50000 28.7% - 0s 0 0 59.22807 0 141 47.00000 59.22807 26.0% - 0s 0 0 57.68750 0 136 47.00000 57.68750 22.7% - 0s H 0 0 50.0000000 57.68750 15.4% - 0s 0 0 57.05402 0 140 50.00000 57.05402 14.1% - 0s 0 0 56.77086 0 141 50.00000 56.77086 13.5% - 0s H 0 0 51.0000000 56.77086 11.3% - 0s 0 0 56.57247 0 142 51.00000 56.57247 10.9% - 0s 0 0 56.37006 0 140 51.00000 56.37006 10.5% - 0s 0 0 56.08522 0 143 51.00000 56.08522 10.0% - 0s 0 0 55.98804 0 139 51.00000 55.98804 9.78% - 0s 0 0 55.91675 0 138 51.00000 55.91675 9.64% - 0s 0 0 55.78582 0 140 51.00000 55.78582 9.38% - 0s 0 0 55.72361 0 142 51.00000 55.72361 9.26% - 0s 0 0 55.70200 0 140 51.00000 55.70200 9.22% - 0s 0 0 55.67132 0 142 51.00000 55.67132 9.16% - 0s 0 0 55.67132 0 142 51.00000 55.67132 9.16% - 0s H 0 0 52.0000000 55.67132 7.06% - 0s 0 2 55.67117 0 142 52.00000 55.67117 7.06% - 0s Cutting planes: Zero half: 98 Explored 97 nodes (4896 simplex iterations) in 0.27 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%