Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:29:21 2012 Optimize a model with 16519 rows, 4970 columns and 54178 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.56s Presolved: 16517 rows, 4968 columns, 53706 nonzeros Variable types: 0 continuous, 4968 integer (4968 binary) Found heuristic solution: objective 70.0000000 Root relaxation: objective 2.000000e+00, 3733 iterations, 0.14 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 1931 5.00000 2.66667 46.7% - 6s 0 0 2.66995 0 4467 5.00000 2.66995 46.6% - 8s 0 0 2.66995 0 4457 5.00000 2.66995 46.6% - 10s 0 0 2.66995 0 4439 5.00000 2.66995 46.6% - 10s 0 0 2.66995 0 4459 5.00000 2.66995 46.6% - 11s 0 0 2.66995 0 4086 5.00000 2.66995 46.6% - 14s 0 0 2.66995 0 3979 5.00000 2.66995 46.6% - 16s 0 0 2.66995 0 3953 5.00000 2.66995 46.6% - 17s 0 0 2.66995 0 3793 5.00000 2.66995 46.6% - 19s 0 0 2.66995 0 3798 5.00000 2.66995 46.6% - 21s 0 0 2.66995 0 3863 5.00000 2.66995 46.6% - 22s 0 0 2.66995 0 3830 5.00000 2.66995 46.6% - 24s 0 0 2.66995 0 3855 5.00000 2.66995 46.6% - 25s 0 0 2.66995 0 3763 5.00000 2.66995 46.6% - 27s 0 0 2.66995 0 3775 5.00000 2.66995 46.6% - 28s 0 0 2.66995 0 3758 5.00000 2.66995 46.6% - 29s 0 2 2.80000 0 3758 5.00000 2.80000 44.0% - 41s * 30 4 13 4.0000000 4.00000 0.0% 489 44s Cutting planes: Clique: 101 Zero half: 2 Explored 31 nodes (86384 simplex iterations) in 44.59 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%