Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:50 2012 Optimize a model with 476 rows, 133 columns and 952 nonzeros Presolve removed 88 rows and 0 columns Presolve time: 0.00s Presolved: 388 rows, 133 columns, 832 nonzeros Variable types: 0 continuous, 133 integer (133 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 5.550000e+01, 228 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.50000 0 105 40.00000 55.50000 38.8% - 0s H 0 0 41.0000000 55.50000 35.4% - 0s H 0 0 43.0000000 55.50000 29.1% - 0s 0 0 54.33333 0 130 43.00000 54.33333 26.4% - 0s 0 0 53.65873 0 130 43.00000 53.65873 24.8% - 0s H 0 0 44.0000000 53.65873 22.0% - 0s 0 0 53.20930 0 132 44.00000 53.20930 20.9% - 0s 0 0 52.83977 0 132 44.00000 52.83977 20.1% - 0s 0 0 52.61908 0 132 44.00000 52.61908 19.6% - 0s 0 0 52.50000 0 131 44.00000 52.50000 19.3% - 0s H 0 0 46.0000000 52.50000 14.1% - 0s 0 0 52.37346 0 132 46.00000 52.37346 13.9% - 0s 0 0 52.28779 0 132 46.00000 52.28779 13.7% - 0s 0 0 52.25510 0 133 46.00000 52.25510 13.6% - 0s 0 0 52.25510 0 131 46.00000 52.25510 13.6% - 0s 0 2 52.25297 0 131 46.00000 52.25297 13.6% - 0s * 207 48 10 47.0000000 50.51921 7.49% 30.4 0s Cutting planes: Zero half: 123 Explored 611 nodes (18009 simplex iterations) in 0.66 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%