Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:07:10 2012 Optimize a model with 2139 rows, 420 columns and 6738 nonzeros Presolve removed 1182 rows and 2 columns Presolve time: 0.06s Presolved: 977 rows, 418 columns, 5702 nonzeros Variable types: 0 continuous, 418 integer (418 binary) Found heuristic solution: objective 20.0000000 Root relaxation: objective 6.000000e+00, 1420 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 6.00000 0 6 20.00000 6.00000 70.0% - 0s H 0 0 16.0000000 6.00000 62.5% - 0s H 0 0 7.0000000 6.00000 14.3% - 0s 0 0 6.00000 0 8 7.00000 6.00000 14.3% - 0s H 0 0 6.0000000 6.00000 0.0% - 0s Cutting planes: Zero half: 1 Explored 0 nodes (2780 simplex iterations) in 0.21 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+00, best bound 6.000000000000e+00, gap 0.0%