Gurobi 5.0.1 (linux64) logging started Fri Nov 16 15:20:39 2012 Optimize a model with 8063 rows, 4032 columns and 27907 nonzeros Presolve removed 1325 rows and 2 columns Presolve time: 0.25s Presolved: 6801 rows, 4030 columns, 28449 nonzeros Variable types: 0 continuous, 4030 integer (4030 binary) Found heuristic solution: objective 63.0000000 Root relaxation: objective 3.000000e+00, 5528 iterations, 0.71 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 500 63.00000 3.00000 95.2% - 2s H 0 0 8.0000000 3.00000 62.5% - 2s H 0 0 6.0000000 3.00000 50.0% - 2s 0 0 3.00000 0 104 6.00000 3.00000 50.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 4s H 0 0 3.0000000 3.00000 0.0% - 4s Cutting planes: Zero half: 12 Explored 0 nodes (18520 simplex iterations) in 4.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%