Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:32:33 2012 Optimize a model with 5412 rows, 1980 columns and 18040 nonzeros Presolve removed 1760 rows and 0 columns Presolve time: 0.11s Presolved: 3652 rows, 1980 columns, 14124 nonzeros Variable types: 0 continuous, 1980 integer (1980 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.000000e+00, 3939 iterations, 0.48 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 107 24.00000 3.00000 87.5% - 1s H 0 0 6.0000000 3.00000 50.0% - 1s 0 0 3.00000 0 199 6.00000 3.00000 50.0% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s 0 0 3.00000 0 122 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 152 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 145 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 148 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 156 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 142 4.00000 3.00000 25.0% - 13s 0 2 3.00000 0 142 4.00000 3.00000 25.0% - 14s 2 3 3.00000 1 142 4.00000 3.00000 25.0% 1294 15s 6 6 3.00000 1 150 4.00000 3.00000 25.0% 432 20s 9 8 3.00000 1 143 4.00000 3.00000 25.0% 288 25s 11 9 3.00000 1 184 4.00000 3.00000 25.0% 235 32s 14 11 infeasible 11 4.00000 3.00000 25.0% 6150 35s 18 10 infeasible 13 4.00000 3.00000 25.0% 4903 40s Cutting planes: Gomory: 6 Zero half: 24 Explored 20 nodes (168224 simplex iterations) in 40.32 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%