Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:29:50 2012 Optimize a model with 6448 rows, 2756 columns and 21892 nonzeros Presolve removed 1196 rows and 0 columns Presolve time: 0.13s Presolved: 5252 rows, 2756 columns, 19084 nonzeros Variable types: 0 continuous, 2756 integer (2756 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.000000e+00, 4740 iterations, 0.44 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 104 25.00000 3.00000 88.0% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 199 5.00000 3.00000 40.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 10s 0 2 3.00000 0 93 4.00000 3.00000 25.0% - 11s 5 5 3.00000 1 69 4.00000 3.00000 25.0% 759 15s 7 6 3.00000 1 95 4.00000 3.00000 25.0% 542 20s 9 8 3.00000 1 113 4.00000 3.00000 25.0% 422 25s 12 10 3.00000 1 82 4.00000 3.00000 25.0% 316 31s 14 11 3.00000 1 85 4.00000 3.00000 25.0% 271 36s Cutting planes: Gomory: 3 Zero half: 7 Explored 18 nodes (234185 simplex iterations) in 39.50 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%