Gurobi 5.6.3 (linux64) logging started Tue Oct 7 23:13:20 2014 Optimize a model with 18633 rows, 18632 columns and 55624 nonzeros Presolve time: 0.37s Presolved: 18633 rows, 18632 columns, 55624 nonzeros Variable types: 0 continuous, 18632 integer (18632 binary) Found heuristic solution: objective 16.3712436 Root relaxation: objective 1.118206e+01, 1542 iterations, 0.11 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 11.1820627 11.18206 0.00% - 0s Explored 0 nodes (1542 simplex iterations) in 0.52 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.118206272476e+01, best bound 1.118206272476e+01, gap 0.0%