Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:47:30 2012 Optimize a model with 16991 rows, 5256 columns and 55870 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.60s Presolved: 17061 rows, 5254 columns, 60582 nonzeros Variable types: 0 continuous, 5254 integer (5254 binary) Found heuristic solution: objective 72.0000000 Root relaxation: objective 2.000000e+00, 3958 iterations, 0.17 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 144 72.00000 2.00000 97.2% - 1s H 0 0 71.0000000 2.00000 97.2% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 316 5.00000 2.66667 46.7% - 5s 0 0 2.67633 0 4216 5.00000 2.67633 46.5% - 6s 0 0 2.67633 0 4206 5.00000 2.67633 46.5% - 9s 0 0 2.67633 0 4222 5.00000 2.67633 46.5% - 9s 0 0 2.67633 0 3526 5.00000 2.67633 46.5% - 17s 0 0 2.67633 0 3632 5.00000 2.67633 46.5% - 24s 0 0 2.67633 0 3621 5.00000 2.67633 46.5% - 33s 0 0 2.67633 0 3657 5.00000 2.67633 46.5% - 39s H 0 0 4.0000000 2.67633 33.1% - 40s 0 0 2.67633 0 3798 4.00000 2.67633 33.1% - 47s 0 0 2.67633 0 3801 4.00000 2.67633 33.1% - 54s 0 0 2.67633 0 3801 4.00000 2.67633 33.1% - 58s 0 1 3.00000 0 3801 4.00000 3.00000 25.0% - 75s Cutting planes: Clique: 136 Zero half: 22 Explored 8 nodes (196945 simplex iterations) in 77.22 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%