Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:08 2012 Optimize a model with 509 rows, 137 columns and 1018 nonzeros Presolve removed 89 rows and 0 columns Presolve time: 0.00s Presolved: 420 rows, 137 columns, 896 nonzeros Variable types: 0 continuous, 137 integer (137 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 5.825000e+01, 254 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.25000 0 130 44.00000 58.25000 32.4% - 0s 0 0 56.87500 0 133 44.00000 56.87500 29.3% - 0s H 0 0 46.0000000 56.87500 23.6% - 0s 0 0 56.18605 0 134 46.00000 56.18605 22.1% - 0s 0 0 55.80171 0 135 46.00000 55.80171 21.3% - 0s 0 0 55.43537 0 135 46.00000 55.43537 20.5% - 0s 0 0 55.04906 0 136 46.00000 55.04906 19.7% - 0s 0 0 54.76101 0 136 46.00000 54.76101 19.0% - 0s 0 0 54.47438 0 137 46.00000 54.47438 18.4% - 0s 0 0 54.35692 0 137 46.00000 54.35692 18.2% - 0s 0 0 54.20359 0 137 46.00000 54.20359 17.8% - 0s 0 0 54.12698 0 136 46.00000 54.12698 17.7% - 0s 0 0 54.12521 0 136 46.00000 54.12521 17.7% - 0s 0 0 54.12521 0 135 46.00000 54.12521 17.7% - 0s 0 2 54.12521 0 135 46.00000 54.12521 17.7% - 0s H 8 8 48.0000000 54.12521 12.8% 55.9 0s H 221 54 49.0000000 52.66667 7.48% 33.0 0s Cutting planes: Gomory: 1 Zero half: 134 Explored 866 nodes (25526 simplex iterations) in 0.96 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.900000000000e+01, best bound 4.900000000000e+01, gap 0.0%