Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:22:16 2012 Optimize a model with 3947 rows, 1806 columns and 13438 nonzeros Presolve removed 968 rows and 2 columns Presolve time: 0.11s Presolved: 2979 rows, 1804 columns, 11112 nonzeros Variable types: 0 continuous, 1804 integer (1804 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 3.000000e+00, 2231 iterations, 0.14 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 58 42.00000 3.00000 92.9% - 0s H 0 0 39.0000000 3.00000 92.3% - 0s H 0 0 22.0000000 3.00000 86.4% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 558 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 32 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 47 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 34 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 38 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 40 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 40 4.00000 3.00000 25.0% - 4s 0 2 3.00000 0 34 4.00000 3.00000 25.0% - 4s 2 3 3.00000 1 40 4.00000 3.00000 25.0% 892 5s 9 8 3.00000 1 70 4.00000 3.00000 25.0% 198 10s 17 13 3.00000 14 68 4.00000 3.00000 25.0% 3281 15s Cutting planes: Gomory: 8 Zero half: 47 Explored 21 nodes (94401 simplex iterations) in 17.18 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%