Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:36:24 2012 Optimize a model with 6499 rows, 2756 columns and 21994 nonzeros Presolve removed 1355 rows and 54 columns Presolve time: 0.16s Presolved: 5144 rows, 2702 columns, 18572 nonzeros Variable types: 0 continuous, 2702 integer (2702 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4618 iterations, 0.55 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 100 52.00000 3.00000 94.2% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 190 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 206 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 146 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 146 4.00000 3.00000 25.0% - 14s 0 2 3.00000 0 146 4.00000 3.00000 25.0% - 17s 4 4 3.00000 1 293 4.00000 3.00000 25.0% 940 21s 6 6 3.00000 1 85 4.00000 3.00000 25.0% 627 27s 8 7 3.00000 1 95 4.00000 3.00000 25.0% 470 33s 9 8 3.00000 1 85 4.00000 3.00000 25.0% 418 35s 11 9 3.00000 1 102 4.00000 3.00000 25.0% 342 40s 13 10 3.00000 1 121 4.00000 3.00000 25.0% 289 47s 16 14 3.00000 15 120 4.00000 3.00000 25.0% 8311 54s 17 15 3.00000 15 112 4.00000 3.00000 25.0% 7871 57s 19 16 3.00000 16 88 4.00000 3.00000 25.0% 7134 62s 32 9 3.00000 16 88 4.00000 3.00000 25.0% 4505 65s Cutting planes: Gomory: 6 Zero half: 20 Explored 36 nodes (227351 simplex iterations) in 66.07 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%