Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:52:20 2012 Optimize a model with 5781 rows, 2256 columns and 19411 nonzeros Presolve removed 1269 rows and 0 columns Presolve time: 0.12s Presolved: 4512 rows, 2256 columns, 16544 nonzeros Variable types: 0 continuous, 2256 integer (2256 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.000000e+00, 3967 iterations, 0.35 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 104 23.00000 3.00000 87.0% - 1s H 0 0 6.0000000 3.00000 50.0% - 1s 0 0 3.00000 0 250 6.00000 3.00000 50.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 79 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 143 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 123 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 139 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 58 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 147 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 147 4.00000 3.00000 25.0% - 18s 0 2 3.00000 0 145 4.00000 3.00000 25.0% - 21s 5 5 3.00000 1 129 4.00000 3.00000 25.0% 1159 26s 7 6 3.00000 1 56 4.00000 3.00000 25.0% 828 30s 11 9 infeasible 13 4.00000 3.00000 25.0% 6522 35s 15 12 3.00000 15 78 4.00000 3.00000 25.0% 4934 41s Cutting planes: Gomory: 1 Zero half: 7 Explored 21 nodes (193466 simplex iterations) in 41.59 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%