Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:52:21 2012 Optimize a model with 6572 rows, 2862 columns and 22366 nonzeros Presolve removed 1431 rows and 0 columns Presolve time: 0.14s Presolved: 5141 rows, 2862 columns, 19133 nonzeros Variable types: 0 continuous, 2862 integer (2862 binary) Found heuristic solution: objective 30.0000000 Root relaxation: objective 3.000000e+00, 5320 iterations, 0.60 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 80 30.00000 3.00000 90.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 172 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 170 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 148 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 152 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 158 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 139 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 156 4.00000 3.00000 25.0% - 21s 0 0 3.00000 0 154 4.00000 3.00000 25.0% - 22s 0 2 3.00000 0 154 4.00000 3.00000 25.0% - 23s 4 4 3.00000 1 83 4.00000 3.00000 25.0% 773 26s 6 6 3.00000 1 110 4.00000 3.00000 25.0% 515 31s 8 7 3.00000 1 158 4.00000 3.00000 25.0% 386 40s 12 10 3.00000 11 148 4.00000 3.00000 25.0% 6859 45s 18 10 infeasible 14 4.00000 3.00000 25.0% 4750 50s Cutting planes: Gomory: 5 Zero half: 6 Explored 29 nodes (218577 simplex iterations) in 52.74 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%