Gurobi 5.6.3 (linux64) logging started Wed Oct 8 06:01:01 2014 Optimize a model with 56883 rows, 56882 columns and 170170 nonzeros Presolve time: 1.56s Presolved: 56883 rows, 56882 columns, 170170 nonzeros Variable types: 0 continuous, 56882 integer (56882 binary) Found heuristic solution: objective 22.8359709 Root relaxation: objective 1.574097e+01, 2887 iterations, 0.48 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 15.7409661 15.74097 0.00% - 2s Explored 0 nodes (2887 simplex iterations) in 2.19 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.574096614807e+01, best bound 1.574096614807e+01, gap 0.0%