Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:40 2012 Optimize a model with 456 rows, 131 columns and 912 nonzeros Presolve removed 91 rows and 4 columns Presolve time: 0.00s Presolved: 365 rows, 127 columns, 778 nonzeros Variable types: 0 continuous, 127 integer (127 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 5.600000e+01, 191 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 56.00000 0 104 41.00000 56.00000 36.6% - 0s 0 0 55.00000 0 104 41.00000 55.00000 34.1% - 0s 0 0 54.66667 0 120 41.00000 54.66667 33.3% - 0s H 0 0 42.0000000 54.66667 30.2% - 0s 0 0 53.50000 0 121 42.00000 53.50000 27.4% - 0s H 0 0 43.0000000 53.50000 24.4% - 0s 0 0 52.08571 0 122 43.00000 52.08571 21.1% - 0s 0 0 51.84000 0 118 43.00000 51.84000 20.6% - 0s 0 0 51.50000 0 120 43.00000 51.50000 19.8% - 0s 0 0 51.29226 0 124 43.00000 51.29226 19.3% - 0s 0 0 51.19086 0 123 43.00000 51.19086 19.0% - 0s 0 0 50.97536 0 123 43.00000 50.97536 18.5% - 0s H 0 0 44.0000000 50.97536 15.9% - 0s 0 0 50.74313 0 126 44.00000 50.74313 15.3% - 0s 0 0 50.57071 0 123 44.00000 50.57071 14.9% - 0s 0 0 50.49769 0 125 44.00000 50.49769 14.8% - 0s 0 0 50.49769 0 125 44.00000 50.49769 14.8% - 0s 0 2 50.49485 0 125 44.00000 50.49485 14.8% - 0s H 17 15 46.0000000 50.49485 9.77% 38.5 0s * 67 27 8 47.0000000 49.88462 6.14% 42.2 0s Cutting planes: Zero half: 136 Explored 197 nodes (7824 simplex iterations) in 0.31 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%