Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:05:33 2012 Optimize a model with 5537 rows, 2450 columns and 18865 nonzeros Presolve removed 1225 rows and 0 columns Presolve time: 0.13s Presolved: 4312 rows, 2450 columns, 15974 nonzeros Variable types: 0 continuous, 2450 integer (2450 binary) Found heuristic solution: objective 29.0000000 Root relaxation: objective 3.000000e+00, 3871 iterations, 0.30 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 98 29.00000 3.00000 89.7% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 169 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 90 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 77 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 130 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 145 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 124 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 147 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 147 4.00000 3.00000 25.0% - 14s 0 2 3.00000 0 147 4.00000 3.00000 25.0% - 15s 6 6 3.00000 1 120 4.00000 3.00000 25.0% 366 20s 9 8 3.00000 1 56 4.00000 3.00000 25.0% 244 25s 13 10 3.00000 1 168 4.00000 3.00000 25.0% 169 32s 16 12 infeasible 16 4.00000 3.00000 25.0% 6564 35s 20 13 3.00000 18 96 4.00000 3.00000 25.0% 5334 40s Cutting planes: Gomory: 7 Zero half: 7 Explored 30 nodes (213815 simplex iterations) in 42.77 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%