Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:24:56 2012 Optimize a model with 4535 rows, 1806 columns and 15202 nonzeros Presolve removed 1178 rows and 2 columns Presolve time: 0.12s Presolved: 3399 rows, 1804 columns, 13950 nonzeros Variable types: 0 continuous, 1804 integer (1804 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 3.000000e+00, 3361 iterations, 0.34 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 54 42.00000 3.00000 92.9% - 1s H 0 0 28.0000000 3.00000 89.3% - 1s H 0 0 21.0000000 3.00000 85.7% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 294 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 74 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 6s 0 2 3.00000 0 91 4.00000 3.00000 25.0% - 7s 4 4 3.00000 1 90 4.00000 3.00000 25.0% 754 10s 7 6 3.00000 1 85 4.00000 3.00000 25.0% 431 15s 9 10 3.00000 16 358 4.00000 3.00000 25.0% 4628 23s 14 6 3.00000 17 137 4.00000 3.00000 25.0% 3178 25s Cutting planes: Gomory: 1 Zero half: 3 Explored 24 nodes (88452 simplex iterations) in 25.37 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%