Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:35:03 2012 Optimize a model with 16519 rows, 4970 columns and 54178 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.56s Presolved: 16587 rows, 4968 columns, 58606 nonzeros Variable types: 0 continuous, 4968 integer (4968 binary) Found heuristic solution: objective 70.0000000 Root relaxation: objective 2.000000e+00, 3713 iterations, 0.14 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 140 70.00000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 1436 5.00000 2.66667 46.7% - 6s H 0 0 4.0000000 2.66667 33.3% - 8s 0 0 2.66667 0 3462 4.00000 2.66667 33.3% - 9s 0 0 2.66667 0 197 4.00000 2.66667 33.3% - 12s 0 0 2.66995 0 3864 4.00000 2.66995 33.3% - 15s 0 0 2.66995 0 3944 4.00000 2.66995 33.3% - 17s 0 0 2.66995 0 3810 4.00000 2.66995 33.3% - 19s 0 0 2.66995 0 3907 4.00000 2.66995 33.3% - 21s 0 0 2.66995 0 3866 4.00000 2.66995 33.3% - 23s 0 0 2.66995 0 3852 4.00000 2.66995 33.3% - 24s 0 0 2.66995 0 3794 4.00000 2.66995 33.3% - 26s 0 0 2.66995 0 3849 4.00000 2.66995 33.3% - 27s 0 0 2.66995 0 3857 4.00000 2.66995 33.3% - 28s 0 0 2.66995 0 3925 4.00000 2.66995 33.3% - 30s 0 0 2.66995 0 3925 4.00000 2.66995 33.3% - 31s 0 2 2.80000 0 3925 4.00000 2.80000 30.0% - 47s Cutting planes: Clique: 100 Zero half: 9 Explored 9 nodes (82846 simplex iterations) in 49.44 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%