Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:33:28 2012 Optimize a model with 7589 rows, 3080 columns and 25573 nonzeros Presolve removed 1707 rows and 2 columns Presolve time: 0.21s Presolved: 5882 rows, 3078 columns, 21344 nonzeros Variable types: 0 continuous, 3078 integer (3078 binary) Found heuristic solution: objective 55.0000000 Root relaxation: objective 3.000000e+00, 5796 iterations, 0.91 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 101 55.00000 3.00000 94.5% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 172 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 116 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 297 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 140 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 252 4.00000 3.00000 25.0% - 21s 0 0 3.00000 0 252 4.00000 3.00000 25.0% - 23s 0 2 3.00000 0 164 4.00000 3.00000 25.0% - 28s 2 3 3.00000 1 252 4.00000 3.00000 25.0% 1742 30s 4 4 3.00000 1 95 4.00000 3.00000 25.0% 871 35s 6 6 3.00000 1 143 4.00000 3.00000 25.0% 581 41s 8 7 3.00000 1 159 4.00000 3.00000 25.0% 436 48s 9 8 3.00000 1 117 4.00000 3.00000 25.0% 387 52s 10 8 3.00000 1 64 4.00000 3.00000 25.0% 348 56s 12 10 3.00000 1 124 4.00000 3.00000 25.0% 290 62s 13 10 3.00000 1 86 4.00000 3.00000 25.0% 268 65s 14 11 3.00000 1 113 4.00000 3.00000 25.0% 249 71s 17 15 3.00000 16 86 4.00000 3.00000 25.0% 8664 77s 19 14 infeasible 17 4.00000 3.00000 25.0% 7925 80s Cutting planes: Gomory: 19 Zero half: 21 Explored 23 nodes (257063 simplex iterations) in 82.64 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%