Gurobi 5.6.3 (linux64) logging started Wed Oct 8 02:09:39 2014 Optimize a model with 37831 rows, 37830 columns and 113102 nonzeros Presolve time: 0.99s Presolved: 37831 rows, 37830 columns, 113102 nonzeros Variable types: 0 continuous, 37830 integer (37830 binary) Found heuristic solution: objective 23.5853282 Root relaxation: objective 1.381108e+01, 2331 iterations, 0.29 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 13.8110806 13.81108 0.00% - 1s Explored 0 nodes (2331 simplex iterations) in 1.37 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.381108062496e+01, best bound 1.381108062496e+01, gap 0.0%