Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:13:52 2012 Optimize a model with 3315 rows, 1560 columns and 11349 nonzeros Presolve removed 858 rows and 0 columns Presolve time: 0.06s Presolved: 2457 rows, 1560 columns, 9399 nonzeros Variable types: 0 continuous, 1560 integer (1560 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 3.000000e+00, 2341 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 38 21.00000 3.00000 85.7% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 65 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 65 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 65 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 84 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 65 4.00000 3.00000 25.0% - 2s 0 2 3.00000 0 65 4.00000 3.00000 25.0% - 2s Cutting planes: Gomory: 6 Zero half: 5 Explored 7 nodes (50129 simplex iterations) in 4.85 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%