Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:45 2012 Optimize a model with 506 rows, 142 columns and 1012 nonzeros Presolve removed 89 rows and 2 columns Presolve time: 0.00s Presolved: 417 rows, 140 columns, 881 nonzeros Variable types: 0 continuous, 140 integer (140 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 6.150000e+01, 203 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.50000 0 123 44.00000 61.50000 39.8% - 0s H 0 0 45.0000000 61.50000 36.7% - 0s 0 0 59.50000 0 136 45.00000 59.50000 32.2% - 0s H 0 0 46.0000000 59.50000 29.3% - 0s 0 0 58.90000 0 124 46.00000 58.90000 28.0% - 0s 0 0 58.49219 0 139 46.00000 58.49219 27.2% - 0s 0 0 57.84286 0 137 46.00000 57.84286 25.7% - 0s 0 0 57.47429 0 134 46.00000 57.47429 24.9% - 0s H 0 0 48.0000000 57.47429 19.7% - 0s 0 0 57.04439 0 134 48.00000 57.04439 18.8% - 0s 0 0 56.83411 0 140 48.00000 56.83411 18.4% - 0s 0 0 56.68647 0 139 48.00000 56.68647 18.1% - 0s H 0 0 49.0000000 56.68647 15.7% - 0s 0 0 56.64839 0 140 49.00000 56.64839 15.6% - 0s 0 0 56.64839 0 139 49.00000 56.64839 15.6% - 0s 0 2 56.64002 0 139 49.00000 56.64002 15.6% - 0s H 443 151 50.0000000 54.58402 9.17% 31.8 0s 615 210 53.16667 9 139 50.00000 54.27132 8.54% 31.1 5s H 1197 135 51.0000000 53.53153 4.96% 36.6 6s Cutting planes: Gomory: 4 Zero half: 179 Explored 1447 nodes (51321 simplex iterations) in 7.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%