Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:30:20 2012 Optimize a model with 15299 rows, 4692 columns and 50250 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.50s Presolved: 15297 rows, 4690 columns, 49800 nonzeros Variable types: 0 continuous, 4690 integer (4690 binary) Found heuristic solution: objective 68.0000000 Root relaxation: objective 2.000000e+00, 3312 iterations, 0.13 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 136 68.00000 2.00000 97.1% - 0s H 0 0 62.0000000 2.00000 96.8% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 198 4.00000 2.66667 33.3% - 5s 0 0 2.67005 0 4173 4.00000 2.67005 33.2% - 5s 0 0 2.67005 0 4195 4.00000 2.67005 33.2% - 8s 0 0 2.67005 0 4003 4.00000 2.67005 33.2% - 15s 0 0 2.67005 0 4043 4.00000 2.67005 33.2% - 22s 0 0 2.67005 0 3882 4.00000 2.67005 33.2% - 30s 0 0 2.67005 0 3960 4.00000 2.67005 33.2% - 36s 0 0 2.67005 0 3952 4.00000 2.67005 33.2% - 43s 0 0 2.67005 0 3952 4.00000 2.67005 33.2% - 49s 0 0 2.67005 0 3969 4.00000 2.67005 33.2% - 54s 0 0 2.67005 0 3909 4.00000 2.67005 33.2% - 59s 0 2 2.80000 0 3909 4.00000 2.80000 30.0% - 95s Cutting planes: Gomory: 1 Clique: 82 Zero half: 5 Explored 9 nodes (174871 simplex iterations) in 97.78 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%