Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:05:53 2012 Optimize a model with 12119 rows, 3660 columns and 39718 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.31s Presolved: 12177 rows, 3658 columns, 42914 nonzeros Variable types: 0 continuous, 3658 integer (3658 binary) Found heuristic solution: objective 60.0000000 Root relaxation: objective 2.000000e+00, 2604 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 120 60.00000 2.00000 96.7% - 0s H 0 0 58.0000000 2.00000 96.6% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2739 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 1507 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 335 5.00000 2.66667 46.7% - 3s 0 0 2.67836 0 3329 5.00000 2.67836 46.4% - 4s 0 0 2.67836 0 3338 5.00000 2.67836 46.4% - 5s 0 0 2.67836 0 2983 5.00000 2.67836 46.4% - 6s 0 0 2.67836 0 2950 5.00000 2.67836 46.4% - 7s 0 0 2.67836 0 2985 5.00000 2.67836 46.4% - 7s 0 0 2.67836 0 2989 5.00000 2.67836 46.4% - 9s 0 0 2.67836 0 2985 5.00000 2.67836 46.4% - 9s 0 0 2.67836 0 2951 5.00000 2.67836 46.4% - 10s 0 0 2.67836 0 2983 5.00000 2.67836 46.4% - 11s 0 0 2.67836 0 2960 5.00000 2.67836 46.4% - 12s 0 2 3.00000 0 2960 5.00000 3.00000 40.0% - 17s H 27 2 4.0000000 3.66667 8.33% 300 19s Cutting planes: Clique: 174 Zero half: 3 Explored 27 nodes (36061 simplex iterations) in 19.17 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%