Gurobi 5.6.3 (linux64) logging started Wed Oct 8 00:42:22 2014 Optimize a model with 28731 rows, 28730 columns and 85852 nonzeros Presolve time: 0.66s Presolved: 28731 rows, 28730 columns, 85852 nonzeros Variable types: 0 continuous, 28730 integer (28730 binary) Found heuristic solution: objective 18.8495205 Root relaxation: objective 1.295417e+01, 1767 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 12.9541674 12.95417 0.00% - 0s Explored 0 nodes (1767 simplex iterations) in 0.89 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.295416743141e+01, best bound 1.295416743141e+01, gap 0.0%