Gurobi 5.6.3 (linux64) logging started Wed Oct 8 03:23:46 2014 Optimize a model with 44733 rows, 44732 columns and 133774 nonzeros Presolve time: 1.14s Presolved: 44733 rows, 44732 columns, 133774 nonzeros Variable types: 0 continuous, 44732 integer (44732 binary) Found heuristic solution: objective 21.8548370 Root relaxation: objective 1.465238e+01, 2821 iterations, 0.41 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 14.6523772 14.65238 0.00% - 1s Explored 0 nodes (2821 simplex iterations) in 1.67 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.465237715199e+01, best bound 1.465237715199e+01, gap 0.0%