Gurobi 5.6.3 (linux64) logging started Wed Oct 8 05:33:29 2014 Optimize a model with 54991 rows, 54990 columns and 164502 nonzeros Presolve time: 1.44s Presolved: 54991 rows, 54990 columns, 164502 nonzeros Variable types: 0 continuous, 54990 integer (54990 binary) Found heuristic solution: objective 25.1635327 Root relaxation: objective 1.532849e+01, 2813 iterations, 0.44 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 15.3284878 15.32849 0.00% - 2s Explored 0 nodes (2813 simplex iterations) in 2.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.532848780254e+01, best bound 1.532848780254e+01, gap 0.0%