Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:38:13 2012 Optimize a model with 15749 rows, 4970 columns and 51868 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.52s Presolved: 15817 rows, 4968 columns, 56318 nonzeros Variable types: 0 continuous, 4968 integer (4968 binary) Found heuristic solution: objective 70.0000000 Root relaxation: objective 2.000000e+00, 3701 iterations, 0.13 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 140 70.00000 2.00000 97.1% - 1s H 0 0 69.0000000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 328 5.00000 2.66667 46.7% - 8s 0 0 2.67662 0 4435 5.00000 2.67662 46.5% - 9s H 0 0 4.0000000 2.67662 33.1% - 11s 0 0 2.67662 0 4405 4.00000 2.67662 33.1% - 12s 0 0 2.67662 0 4392 4.00000 2.67662 33.1% - 12s 0 0 2.67662 0 4397 4.00000 2.67662 33.1% - 13s 0 0 2.67662 0 3960 4.00000 2.67662 33.1% - 16s 0 0 2.67662 0 3973 4.00000 2.67662 33.1% - 18s 0 0 2.67662 0 3970 4.00000 2.67662 33.1% - 19s 0 0 2.67662 0 3963 4.00000 2.67662 33.1% - 21s 0 0 2.67662 0 3969 4.00000 2.67662 33.1% - 23s 0 0 2.67662 0 3980 4.00000 2.67662 33.1% - 25s 0 0 2.67662 0 3958 4.00000 2.67662 33.1% - 26s 0 0 2.67662 0 3967 4.00000 2.67662 33.1% - 27s 0 0 2.67662 0 3967 4.00000 2.67662 33.1% - 28s 0 1 3.00000 0 3967 4.00000 3.00000 25.0% - 39s 8 1 infeasible 3 4.00000 3.00000 25.0% 442 40s Cutting planes: Clique: 167 Zero half: 3 Explored 10 nodes (68992 simplex iterations) in 40.71 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%