Gurobi 5.6.3 (linux64) logging started Wed Oct 8 02:42:36 2014 Optimize a model with 41007 rows, 41006 columns and 122614 nonzeros Presolve time: 1.10s Presolved: 41007 rows, 41006 columns, 122614 nonzeros Variable types: 0 continuous, 41006 integer (41006 binary) Found heuristic solution: objective 22.4355782 Root relaxation: objective 1.440565e+01, 2817 iterations, 0.40 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 14.40565 0 214 22.43558 14.40565 35.8% - 1s H 0 0 14.4626808 14.40565 0.39% - 1s H 0 0 14.4276433 14.40565 0.15% - 1s 0 0 14.41613 0 244 14.42764 14.41613 0.08% - 2s 0 0 14.41613 0 82 14.42764 14.41613 0.08% - 2s 0 0 14.41891 0 120 14.42764 14.41891 0.06% - 2s H 0 0 14.4273224 14.41891 0.06% - 2s 0 0 14.42348 0 155 14.42732 14.42348 0.03% - 2s 0 1 14.42518 0 155 14.42732 14.42518 0.01% - 2s Explored 3 nodes (3398 simplex iterations) in 2.42 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.442732236138e+01, best bound 1.442732236138e+01, gap 0.0%