Gurobi 5.6.3 (linux64) logging started Wed Oct 8 03:42:42 2014 Optimize a model with 46441 rows, 46440 columns and 138890 nonzeros Presolve time: 1.15s Presolved: 46441 rows, 46440 columns, 138890 nonzeros Variable types: 0 continuous, 46440 integer (46440 binary) Found heuristic solution: objective 21.6910081 Root relaxation: objective 1.478008e+01, 2726 iterations, 0.38 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 14.7800773 14.78008 0.00% - 1s Explored 0 nodes (2726 simplex iterations) in 1.65 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.478007725331e+01, best bound 1.478007725331e+01, gap 0.0%