Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:22:34 2012 Optimize a model with 4241 rows, 1806 columns and 14320 nonzeros Presolve removed 1136 rows and 2 columns Presolve time: 0.11s Presolved: 3105 rows, 1804 columns, 11484 nonzeros Variable types: 0 continuous, 1804 integer (1804 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 3.000000e+00, 2912 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 62 42.00000 3.00000 92.9% - 1s H 0 0 29.0000000 3.00000 89.7% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 52 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 181 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 89 4.00000 3.00000 25.0% - 7s 0 2 3.00000 0 89 4.00000 3.00000 25.0% - 7s 4 4 3.00000 1 40 4.00000 3.00000 25.0% 309 10s 9 10 3.00000 16 68 4.00000 3.00000 25.0% 4041 16s 13 7 3.00000 17 869 4.00000 3.00000 25.0% 2985 25s Cutting planes: Zero half: 1 Explored 18 nodes (91687 simplex iterations) in 26.30 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%