Gurobi 5.6.3 (linux64) logging started Wed Oct 8 04:13:40 2014 Optimize a model with 49063 rows, 49062 columns and 146744 nonzeros Presolve time: 1.30s Presolved: 49063 rows, 49062 columns, 146744 nonzeros Variable types: 0 continuous, 49062 integer (49062 binary) Found heuristic solution: objective 20.8323790 Root relaxation: objective 1.536668e+01, 3517 iterations, 0.59 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 15.3666815 15.36668 0.00% - 2s Explored 0 nodes (3517 simplex iterations) in 2.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.536668151896e+01, best bound 1.536668151896e+01, gap 0.0%