Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:54:50 2012 Optimize a model with 8007 rows, 3192 columns and 26934 nonzeros Presolve removed 1346 rows and 2 columns Presolve time: 0.24s Presolved: 6717 rows, 3190 columns, 26696 nonzeros Variable types: 0 continuous, 3190 integer (3190 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 3.000000e+00, 5075 iterations, 0.74 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 62 56.00000 3.00000 94.6% - 3s H 0 0 41.0000000 3.00000 92.7% - 3s H 0 0 13.0000000 3.00000 76.9% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 528 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 101 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 116 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 131 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 103 4.00000 3.00000 25.0% - 24s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 26s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 29s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 30s 0 2 3.00000 0 102 4.00000 3.00000 25.0% - 35s 4 4 3.00000 1 72 4.00000 3.00000 25.0% 2224 42s 6 6 3.00000 1 120 4.00000 3.00000 25.0% 1483 48s 7 6 3.00000 1 68 4.00000 3.00000 25.0% 1271 52s 8 7 3.00000 1 87 4.00000 3.00000 25.0% 1112 55s 9 8 3.00000 1 114 4.00000 3.00000 25.0% 988 61s 12 12 3.00000 14 116 4.00000 3.00000 25.0% 9810 68s 13 12 3.00000 14 82 4.00000 3.00000 25.0% 9199 70s Cutting planes: Gomory: 2 Zero half: 12 Explored 20 nodes (264673 simplex iterations) in 74.90 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%