Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:00:42 2012 Optimize a model with 10499 rows, 3660 columns and 34858 nonzeros Presolve removed 3 rows and 62 columns Presolve time: 0.27s Presolved: 10496 rows, 3598 columns, 34448 nonzeros Variable types: 0 continuous, 3598 integer (3598 binary) Found heuristic solution: objective 60.0000000 Root relaxation: objective 2.000000e+00, 2682 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 118 60.00000 2.00000 96.7% - 0s H 0 0 54.0000000 2.00000 96.3% - 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 2763 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 2993 4.00000 2.66667 33.3% - 2s 0 0 2.66667 0 151 4.00000 2.66667 33.3% - 7s 0 0 2.67052 0 2597 4.00000 2.67052 33.2% - 15s 0 0 2.67059 0 2647 4.00000 2.67059 33.2% - 20s 0 0 3.00000 0 144 4.00000 3.00000 25.0% - 23s 0 0 infeasible 0 4.00000 3.00001 25.0% - 23s Cutting planes: Gomory: 6 Clique: 2 Zero half: 120 Explored 0 nodes (73003 simplex iterations) in 23.25 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%