Gurobi 5.0.1 (linux64) logging started Fri Nov 16 16:56:12 2012 Optimize a model with 15633 rows, 6642 columns and 53217 nonzeros Presolve time: 0.12s Presolved: 15633 rows, 6642 columns, 53268 nonzeros Variable types: 0 continuous, 6642 integer (6642 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 2.000000e+00, 6884 iterations, 0.30 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 162 54.00000 2.00000 96.3% - 1s H 0 0 13.0000000 2.00000 84.6% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.00000 0 162 5.00000 2.00000 60.0% - 5s 0 0 2.00000 0 162 5.00000 2.00000 60.0% - 16s 0 0 2.00000 0 162 5.00000 2.00000 60.0% - 28s 0 0 2.00000 0 162 5.00000 2.00000 60.0% - 40s H 0 0 4.0000000 2.00000 50.0% - 40s 0 0 2.00000 0 162 4.00000 2.00000 50.0% - 52s 0 0 2.00000 0 162 4.00000 2.00000 50.0% - 62s 0 2 2.00000 0 162 4.00000 2.00000 50.0% - 94s 1 3 2.50000 1 1192 4.00000 2.00000 50.0% 59556 110s 2 4 2.50000 1 1156 4.00000 2.50000 37.5% 45114 124s 3 5 3.00000 2 152 4.00000 2.50000 37.5% 31030 125s 38 14 2.50000 2 159 4.00000 2.50000 37.5% 2931 131s 55 17 3.00000 4 150 4.00000 2.50000 37.5% 2228 135s 83 27 3.00000 8 120 4.00000 2.50000 37.5% 1564 141s 690 15 3.00000 6 114 4.00000 3.00000 25.0% 297 145s Cutting planes: Clique: 71 Explored 952 nodes (373776 simplex iterations) in 146.14 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%