Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:18:09 2012 Optimize a model with 18687 rows, 5402 columns and 61099 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.67s Presolved: 18685 rows, 5400 columns, 60587 nonzeros Variable types: 0 continuous, 5400 integer (5400 binary) Found heuristic solution: objective 73.0000000 Root relaxation: objective 2.000000e+00, 3873 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 146 73.00000 2.00000 97.3% - 1s H 0 0 67.0000000 2.00000 97.0% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 2698 5.00000 2.66667 46.7% - 10s 0 0 3.00000 0 138 5.00000 3.00000 40.0% - 16s H 0 0 4.0000000 3.00000 25.0% - 16s 0 0 3.00000 0 179 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 199 4.00000 3.00000 25.0% - 17s 0 0 infeasible 0 4.00000 3.00001 25.0% - 17s Cutting planes: Gomory: 2 Zero half: 106 Explored 0 nodes (60305 simplex iterations) in 17.46 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%