Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:42:16 2012 Optimize a model with 6499 rows, 2756 columns and 21994 nonzeros Presolve removed 1354 rows and 2 columns Presolve time: 0.15s Presolved: 5197 rows, 2754 columns, 21328 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4271 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 0 494 52.00000 3.00000 94.2% - 1s H 0 0 39.0000000 3.00000 92.3% - 1s H 0 0 28.0000000 3.00000 89.3% - 1s H 0 0 16.0000000 3.00000 81.2% - 1s 0 0 3.00000 0 103 16.00000 3.00000 81.2% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s 0 0 3.00000 0 86 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 68 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 113 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 111 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 101 4.00000 3.00000 25.0% - 20s 0 2 3.00000 0 84 4.00000 3.00000 25.0% - 22s 4 4 3.00000 1 185 4.00000 3.00000 25.0% 1347 27s 6 6 3.00000 1 101 4.00000 3.00000 25.0% 898 31s 8 7 3.00000 1 78 4.00000 3.00000 25.0% 674 36s 10 8 3.00000 1 66 4.00000 3.00000 25.0% 539 42s 12 10 3.00000 1 68 4.00000 3.00000 25.0% 449 46s 13 10 3.00000 1 101 4.00000 3.00000 25.0% 415 51s 17 13 3.00000 15 84 4.00000 3.00000 25.0% 8276 56s Cutting planes: Gomory: 3 Zero half: 8 Explored 20 nodes (258727 simplex iterations) in 56.77 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%