Gurobi 5.6.3 (linux64) logging started Wed Oct 8 05:14:01 2014 Optimize a model with 53593 rows, 53592 columns and 160314 nonzeros Presolve time: 1.40s Presolved: 53593 rows, 53592 columns, 160314 nonzeros Variable types: 0 continuous, 53592 integer (53592 binary) Found heuristic solution: objective 21.6947937 Root relaxation: objective 1.468922e+01, 2635 iterations, 0.41 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 14.6892244 14.68922 0.00% - 1s Explored 0 nodes (2635 simplex iterations) in 1.95 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.468922442009e+01, best bound 1.468922442009e+01, gap 0.0%