Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:37:03 2012 Optimize a model with 7644 rows, 3080 columns and 25738 nonzeros Presolve removed 1102 rows and 2 columns Presolve time: 0.22s Presolved: 6597 rows, 3078 columns, 25830 nonzeros Variable types: 0 continuous, 3078 integer (3078 binary) Found heuristic solution: objective 55.0000000 Root relaxation: objective 3.000000e+00, 5644 iterations, 0.68 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 66 55.00000 3.00000 94.5% - 4s H 0 0 42.0000000 3.00000 92.9% - 4s H 0 0 12.0000000 3.00000 75.0% - 4s H 0 0 5.0000000 3.00000 40.0% - 4s 0 0 3.00000 0 66 5.00000 3.00000 40.0% - 4s H 0 0 4.0000000 3.00000 25.0% - 5s 0 0 3.00000 0 78 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 116 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 68 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 111 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 109 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 124 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 115 4.00000 3.00000 25.0% - 21s 0 2 3.00000 0 114 4.00000 3.00000 25.0% - 26s 4 4 3.00000 1 72 4.00000 3.00000 25.0% 2016 32s 6 6 3.00000 1 120 4.00000 3.00000 25.0% 1344 35s 8 7 3.00000 1 99 4.00000 3.00000 25.0% 1008 41s 9 8 3.00000 1 113 4.00000 3.00000 25.0% 896 46s 11 9 3.00000 1 100 4.00000 3.00000 25.0% 733 50s 12 12 3.00000 11 114 4.00000 3.00000 25.0% 9373 55s 14 13 3.00000 12 366 4.00000 3.00000 25.0% 8303 71s Cutting planes: Zero half: 1 Explored 22 nodes (231349 simplex iterations) in 73.16 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%