Gurobi 5.0.1 (linux64) logging started Fri Nov 16 17:04:32 2012 Optimize a model with 12393 rows, 6642 columns and 43497 nonzeros Presolve removed 1866 rows and 243 columns Presolve time: 0.26s Presolved: 10527 rows, 6399 columns, 38637 nonzeros Variable types: 0 continuous, 6399 integer (6399 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 3.000000e+00, 9870 iterations, 1.54 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 85 41.00000 3.00000 92.7% - 4s H 0 0 4.0000000 3.00000 25.0% - 4s H 0 0 3.0000000 3.00000 0.0% - 4s Explored 0 nodes (29674 simplex iterations) in 4.91 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%