Gurobi 5.6.3 (linux64) logging started Wed Oct 8 01:26:00 2014 Optimize a model with 33307 rows, 33306 columns and 99554 nonzeros Presolve time: 0.95s Presolved: 33307 rows, 33306 columns, 99554 nonzeros Variable types: 0 continuous, 33306 integer (33306 binary) Found heuristic solution: objective 19.4023825 Root relaxation: objective 1.317942e+01, 2016 iterations, 0.23 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 13.17942 0 150 19.40238 13.17942 32.1% - 1s H 0 0 13.1918660 13.17942 0.09% - 1s H 0 0 13.1843436 13.17942 0.04% - 1s Explored 0 nodes (2016 simplex iterations) in 2.48 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.318434361442e+01, best bound 1.318434361442e+01, gap 0.0%