Gurobi 5.6.3 (linux64) logging started Wed Oct 8 00:33:23 2014 Optimize a model with 27723 rows, 27722 columns and 82834 nonzeros Presolve time: 0.69s Presolved: 27723 rows, 27722 columns, 82834 nonzeros Variable types: 0 continuous, 27722 integer (27722 binary) Found heuristic solution: objective 17.2723041 Root relaxation: objective 1.307593e+01, 1954 iterations, 0.18 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 13.0759332 13.07593 0.00% - 0s Explored 0 nodes (1954 simplex iterations) in 0.94 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.307593316328e+01, best bound 1.307593316328e+01, gap 0.0%