Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:44:45 2012 Optimize a model with 18071 rows, 5256 columns and 59110 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.65s Presolved: 18141 rows, 5254 columns, 63792 nonzeros Variable types: 0 continuous, 5254 integer (5254 binary) Found heuristic solution: objective 71.0000000 Root relaxation: objective 2.000000e+00, 3910 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 144 71.00000 2.00000 97.2% - 1s H 0 0 64.0000000 2.00000 96.9% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 783 5.00000 2.66667 46.7% - 7s 0 0 2.66667 0 3168 5.00000 2.66667 46.7% - 7s H 0 0 4.0000000 2.66667 33.3% - 10s 0 0 2.66667 0 258 4.00000 2.66667 33.3% - 14s 0 0 2.67308 0 4055 4.00000 2.67308 33.2% - 16s 0 0 2.67308 0 4087 4.00000 2.67308 33.2% - 18s 0 0 2.67308 0 3992 4.00000 2.67308 33.2% - 21s 0 0 2.67308 0 4049 4.00000 2.67308 33.2% - 22s 0 0 2.67308 0 4053 4.00000 2.67308 33.2% - 24s 0 0 2.67308 0 4046 4.00000 2.67308 33.2% - 27s 0 0 2.67308 0 4037 4.00000 2.67308 33.2% - 29s 0 0 2.67308 0 4063 4.00000 2.67308 33.2% - 31s 0 0 2.67308 0 4042 4.00000 2.67308 33.2% - 33s 0 0 2.67308 0 4061 4.00000 2.67308 33.2% - 34s 0 0 2.67308 0 4061 4.00000 2.67308 33.2% - 35s 0 1 3.00000 0 4061 4.00000 3.00000 25.0% - 51s Cutting planes: Clique: 150 Zero half: 6 Explored 6 nodes (79431 simplex iterations) in 52.28 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%