Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:34:45 2012 Optimize a model with 16487 rows, 5256 columns and 54358 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.60s Presolved: 16485 rows, 5254 columns, 53900 nonzeros Variable types: 0 continuous, 5254 integer (5254 binary) Found heuristic solution: objective 72.0000000 Root relaxation: objective 2.000000e+00, 3810 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 0 144 72.00000 2.00000 97.2% - 1s H 0 0 71.0000000 2.00000 97.2% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s H 0 0 4.0000000 2.00000 50.0% - 1s 0 0 2.66667 0 339 4.00000 2.66667 33.3% - 7s 0 0 2.67633 0 4751 4.00000 2.67633 33.1% - 9s 0 0 2.67633 0 4749 4.00000 2.67633 33.1% - 11s 0 0 2.67633 0 4747 4.00000 2.67633 33.1% - 12s 0 0 2.67633 0 4735 4.00000 2.67633 33.1% - 13s 0 0 2.67633 0 4727 4.00000 2.67633 33.1% - 14s 0 0 2.67633 0 4724 4.00000 2.67633 33.1% - 14s 0 0 2.67633 0 4741 4.00000 2.67633 33.1% - 15s 0 0 2.67633 0 4546 4.00000 2.67633 33.1% - 18s 0 0 2.67633 0 4364 4.00000 2.67633 33.1% - 21s 0 0 2.67633 0 4353 4.00000 2.67633 33.1% - 23s 0 0 2.67633 0 4364 4.00000 2.67633 33.1% - 26s 0 0 2.67633 0 4415 4.00000 2.67633 33.1% - 27s 0 0 2.67633 0 4408 4.00000 2.67633 33.1% - 30s 0 0 2.67633 0 4360 4.00000 2.67633 33.1% - 32s 0 0 2.67633 0 4464 4.00000 2.67633 33.1% - 34s 0 0 2.67633 0 4442 4.00000 2.67633 33.1% - 35s 0 1 3.00000 0 4442 4.00000 3.00000 25.0% - 57s Cutting planes: Clique: 189 Zero half: 28 Explored 10 nodes (85885 simplex iterations) in 58.13 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%