Gurobi 5.6.3 (linux64) logging started Tue Oct 7 23:54:22 2014 Optimize a model with 22953 rows, 22952 columns and 68554 nonzeros Presolve time: 0.48s Presolved: 22953 rows, 22952 columns, 68554 nonzeros Variable types: 0 continuous, 22952 integer (22952 binary) Found heuristic solution: objective 20.4274225 Root relaxation: objective 1.205730e+01, 1858 iterations, 0.17 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 12.0573014 12.05730 0.00% - 0s Explored 0 nodes (1858 simplex iterations) in 0.71 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.205730138921e+01, best bound 1.205730138921e+01, gap 0.0%