Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:55:02 2012 Optimize a model with 7154 rows, 2862 columns and 24060 nonzeros Presolve removed 1433 rows and 2 columns Presolve time: 0.19s Presolved: 5721 rows, 2860 columns, 20399 nonzeros Variable types: 0 continuous, 2860 integer (2860 binary) Found heuristic solution: objective 53.0000000 Root relaxation: objective 3.000000e+00, 4923 iterations, 0.60 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 290 53.00000 3.00000 94.3% - 2s H 0 0 48.0000000 3.00000 93.8% - 2s H 0 0 8.0000000 3.00000 62.5% - 2s H 0 0 7.0000000 3.00000 57.1% - 2s 0 0 3.00000 0 751 7.00000 3.00000 57.1% - 2s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 119 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 449 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 1822 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 116 4.00000 3.00000 25.0% - 16s 0 2 3.00000 0 115 4.00000 3.00000 25.0% - 19s 2 3 3.00000 1 116 4.00000 3.00000 25.0% 2160 21s 4 4 3.00000 1 1383 4.00000 3.00000 25.0% 1080 28s 5 5 3.00000 1 79 4.00000 3.00000 25.0% 864 32s 6 6 3.00000 1 90 4.00000 3.00000 25.0% 720 35s 8 7 3.00000 1 100 4.00000 3.00000 25.0% 540 42s 9 8 3.00000 1 112 4.00000 3.00000 25.0% 480 45s 11 9 3.00000 1 121 4.00000 3.00000 25.0% 393 56s 14 13 3.00000 15 121 4.00000 3.00000 25.0% 9051 65s 16 14 3.00000 16 95 4.00000 3.00000 25.0% 8004 72s 21 14 3.00000 18 86 4.00000 3.00000 25.0% 6300 75s 44 3 infeasible 21 4.00000 3.00000 25.0% 3371 80s Cutting planes: Gomory: 4 Zero half: 45 Explored 56 nodes (233526 simplex iterations) in 83.43 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%