Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:23:40 2012 Optimize a model with 7590 rows, 3080 columns and 25630 nonzeros Presolve removed 1100 rows and 0 columns Presolve time: 0.14s Presolved: 6490 rows, 3080 columns, 22935 nonzeros Variable types: 0 continuous, 3080 integer (3080 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.000000e+00, 6158 iterations, 0.77 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 60 28.00000 3.00000 89.3% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 94 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 83 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 95 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 103 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 15s 0 2 3.00000 0 93 4.00000 3.00000 25.0% - 18s 4 4 3.00000 1 118 4.00000 3.00000 25.0% 1516 22s 5 5 3.00000 1 99 4.00000 3.00000 25.0% 1213 26s 7 6 3.00000 1 113 4.00000 3.00000 25.0% 866 34s 8 7 3.00000 1 157 4.00000 3.00000 25.0% 758 37s 9 8 3.00000 1 131 4.00000 3.00000 25.0% 674 40s 11 9 3.00000 1 100 4.00000 3.00000 25.0% 551 46s 12 10 3.00000 1 102 4.00000 3.00000 25.0% 505 50s 14 11 3.00000 1 170 4.00000 3.00000 25.0% 433 58s 15 12 3.00000 1 173 4.00000 3.00000 25.0% 404 67s 17 13 3.00000 1 173 4.00000 3.00000 25.0% 357 70s 19 14 3.00000 16 122 4.00000 3.00000 25.0% 10205 77s 21 14 3.00000 17 110 4.00000 3.00000 25.0% 9264 80s 22 14 3.00000 18 221 4.00000 3.00000 25.0% 8899 85s Cutting planes: Gomory: 2 Zero half: 9 Explored 32 nodes (315855 simplex iterations) in 88.39 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%