Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:46:30 2012 Optimize a model with 4415 rows, 2162 columns and 15178 nonzeros Presolve removed 1061 rows and 48 columns Presolve time: 0.11s Presolved: 3354 rows, 2114 columns, 12594 nonzeros Variable types: 0 continuous, 2114 integer (2114 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 3.000000e+00, 3281 iterations, 0.30 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 83 46.00000 3.00000 93.5% - 1s H 0 0 36.0000000 3.00000 91.7% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 353 4.00000 3.00000 25.0% - 1s 0 0 infeasible 0 4.00000 3.00001 25.0% - 1s Cutting planes: Gomory: 3 Zero half: 25 Explored 0 nodes (14389 simplex iterations) in 1.89 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%