Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:09:25 2012 Optimize a model with 5291 rows, 2450 columns and 18079 nonzeros Presolve removed 934 rows and 51 columns Presolve time: 0.12s Presolved: 4357 rows, 2399 columns, 15745 nonzeros Variable types: 0 continuous, 2399 integer (2399 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 3.000000e+00, 3812 iterations, 0.34 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 78 49.00000 3.00000 93.9% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 766 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 38 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 20 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 28 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 78 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 49 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 13s 0 2 3.00000 0 104 4.00000 3.00000 25.0% - 16s 4 4 3.00000 1 62 4.00000 3.00000 25.0% 2229 20s 7 6 3.00000 1 20 4.00000 3.00000 25.0% 1274 26s 9 8 3.00000 1 108 4.00000 3.00000 25.0% 991 31s 13 12 3.00000 10 89 4.00000 3.00000 25.0% 6558 35s 14 12 3.00000 11 549 4.00000 3.00000 25.0% 6231 43s 21 11 3.00000 12 70 4.00000 3.00000 25.0% 4324 45s Cutting planes: Gomory: 1 Zero half: 6 Explored 43 nodes (187953 simplex iterations) in 49.18 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%