Gurobi 5.0.1 (linux64) logging started Fri Nov 16 15:20:12 2012 Optimize a model with 8001 rows, 4032 columns and 27783 nonzeros Presolve removed 1325 rows and 126 columns Presolve time: 0.15s Presolved: 6676 rows, 3906 columns, 24444 nonzeros Variable types: 0 continuous, 3906 integer (3906 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.000000e+00, 6402 iterations, 0.67 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 75 31.00000 3.00000 90.3% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s H 0 0 3.0000000 3.00000 0.0% - 2s Explored 0 nodes (18744 simplex iterations) in 2.22 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%