Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:42 2012 Optimize a model with 521 rows, 147 columns and 1042 nonzeros Presolve removed 94 rows and 0 columns Presolve time: 0.00s Presolved: 427 rows, 147 columns, 909 nonzeros Variable types: 0 continuous, 147 integer (147 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.150000e+01, 244 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 0 121 49.00000 61.50000 25.5% - 0s 0 0 60.68605 0 146 49.00000 60.68605 23.8% - 0s 0 0 59.52121 0 146 49.00000 59.52121 21.5% - 0s 0 0 58.73801 0 146 49.00000 58.73801 19.9% - 0s 0 0 58.46491 0 145 49.00000 58.46491 19.3% - 0s 0 0 58.31813 0 146 49.00000 58.31813 19.0% - 0s 0 0 58.16293 0 146 49.00000 58.16293 18.7% - 0s 0 0 57.93217 0 146 49.00000 57.93217 18.2% - 0s 0 0 57.84470 0 146 49.00000 57.84470 18.1% - 0s 0 0 57.73859 0 146 49.00000 57.73859 17.8% - 0s 0 0 57.65398 0 145 49.00000 57.65398 17.7% - 0s 0 0 57.59046 0 145 49.00000 57.59046 17.5% - 0s 0 0 57.53116 0 145 49.00000 57.53116 17.4% - 0s 0 0 57.41804 0 146 49.00000 57.41804 17.2% - 0s 0 0 57.38408 0 146 49.00000 57.38408 17.1% - 0s 0 0 57.38408 0 145 49.00000 57.38408 17.1% - 0s 0 2 57.37766 0 145 49.00000 57.37766 17.1% - 0s H 20 12 50.0000000 57.09257 14.2% 51.4 0s H 54 19 51.0000000 56.80575 11.4% 41.4 0s * 143 43 8 52.0000000 56.14161 7.96% 39.0 0s 616 82 54.11905 10 145 52.00000 54.67647 5.15% 33.6 5s Cutting planes: Zero half: 204 Explored 1232 nodes (46635 simplex iterations) in 7.48 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%