Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:56 2012 Optimize a model with 511 rows, 143 columns and 1022 nonzeros Presolve removed 115 rows and 2 columns Presolve time: 0.00s Presolved: 396 rows, 141 columns, 861 nonzeros Variable types: 0 continuous, 141 integer (141 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 5.850000e+01, 224 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.50000 0 121 42.00000 58.50000 39.3% - 0s H 0 0 44.0000000 58.50000 33.0% - 0s 0 0 57.59245 0 139 44.00000 57.59245 30.9% - 0s H 0 0 46.0000000 57.59245 25.2% - 0s H 0 0 47.0000000 57.59245 22.5% - 0s 0 0 56.54310 0 136 47.00000 56.54310 20.3% - 0s 0 0 56.02595 0 137 47.00000 56.02595 19.2% - 0s H 0 0 49.0000000 56.02595 14.3% - 0s 0 0 55.76211 0 137 49.00000 55.76211 13.8% - 0s 0 0 55.59306 0 139 49.00000 55.59306 13.5% - 0s 0 0 55.55208 0 139 49.00000 55.55208 13.4% - 0s 0 0 55.50858 0 137 49.00000 55.50858 13.3% - 0s 0 0 55.44578 0 138 49.00000 55.44578 13.2% - 0s 0 0 55.44269 0 137 49.00000 55.44269 13.1% - 0s 0 0 55.44242 0 138 49.00000 55.44242 13.1% - 0s 0 0 55.44242 0 134 49.00000 55.44242 13.1% - 0s 0 2 55.44232 0 133 49.00000 55.44232 13.1% - 0s * 11 9 6 50.0000000 55.30307 10.6% 45.7 0s 615 103 51.40000 18 140 50.00000 52.65385 5.31% 24.1 5s Cutting planes: Gomory: 3 Zero half: 56 Explored 1537 nodes (36309 simplex iterations) in 6.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%