Gurobi 5.0.1 (linux64) logging started Fri Nov 16 02:35:24 2012 Optimize a model with 9140 rows, 1122 columns and 28378 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.10s Presolved: 9171 rows, 1120 columns, 31380 nonzeros Variable types: 0 continuous, 1120 integer (1120 binary) Found heuristic solution: objective 33.0000000 Root relaxation: objective 3.362637e+00, 6036 iterations, 0.46 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.36264 0 1088 33.00000 3.36264 89.8% - 0s H 0 0 28.0000000 3.36264 88.0% - 0s 0 0 4.00000 0 118 28.00000 4.00000 85.7% - 1s H 0 0 23.0000000 4.00000 82.6% - 1s 0 0 4.67066 0 1064 23.00000 4.67066 79.7% - 2s H 0 0 21.0000000 4.67066 77.8% - 2s 0 0 4.69231 0 569 21.00000 4.69231 77.7% - 2s 0 0 4.70000 0 1019 21.00000 4.70000 77.6% - 2s 0 0 4.70000 0 884 21.00000 4.70000 77.6% - 4s H 0 0 10.0000000 4.70000 53.0% - 4s H 0 0 9.0000000 4.70000 47.8% - 5s 0 2 4.70000 0 869 9.00000 4.70000 47.8% - 6s H 27 15 8.0000000 4.80000 40.0% 301 7s H 82 21 7.0000000 5.00000 28.6% 181 8s 124 19 5.00000 6 72 7.00000 5.00000 28.6% 186 10s 275 39 6.00000 9 56 7.00000 6.00000 14.3% 171 15s 703 67 6.00000 7 175 7.00000 6.00000 14.3% 131 20s Cutting planes: Gomory: 22 Clique: 58 Zero half: 154 Explored 704 nodes (109936 simplex iterations) in 20.91 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.000000000000e+00, best bound 7.000000000000e+00, gap 0.0%