Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:56:16 2012 Optimize a model with 5827 rows, 2256 columns and 19503 nonzeros Presolve removed 1271 rows and 2 columns Presolve time: 0.14s Presolved: 4603 rows, 2254 columns, 18651 nonzeros Variable types: 0 continuous, 2254 integer (2254 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 3.000000e+00, 4129 iterations, 0.52 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 91 47.00000 3.00000 93.6% - 2s H 0 0 14.0000000 3.00000 78.6% - 2s H 0 0 6.0000000 3.00000 50.0% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s 0 0 3.00000 0 93 5.00000 3.00000 40.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 68 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 84 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 58 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 141 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 141 4.00000 3.00000 25.0% - 19s 0 2 3.00000 0 141 4.00000 3.00000 25.0% - 21s 4 4 3.00000 1 76 4.00000 3.00000 25.0% 870 25s 7 6 3.00000 1 117 4.00000 3.00000 25.0% 497 32s 9 8 3.00000 1 106 4.00000 3.00000 25.0% 387 37s 10 8 3.00000 1 126 4.00000 3.00000 25.0% 348 42s 13 12 3.00000 15 127 4.00000 3.00000 25.0% 7126 45s Cutting planes: Gomory: 3 Zero half: 39 Explored 17 nodes (197476 simplex iterations) in 45.72 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%