Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:30:48 2012 Optimize a model with 4840 rows, 1980 columns and 16324 nonzeros Presolve removed 1276 rows and 0 columns Presolve time: 0.11s Presolved: 3564 rows, 1980 columns, 13464 nonzeros Variable types: 0 continuous, 1980 integer (1980 binary) Found heuristic solution: objective 29.0000000 Root relaxation: objective 3.000000e+00, 2422 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 91 29.00000 3.00000 89.7% - 0s H 0 0 6.0000000 3.00000 50.0% - 0s H 0 0 5.0000000 3.00000 40.0% - 0s 0 0 3.00000 0 180 5.00000 3.00000 40.0% - 0s 0 0 3.00000 0 124 5.00000 3.00000 40.0% - 2s 0 0 3.00000 0 126 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 142 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 144 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 147 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 147 4.00000 3.00000 25.0% - 8s 0 2 3.00000 0 147 4.00000 3.00000 25.0% - 9s 4 4 3.00000 1 83 4.00000 3.00000 25.0% 865 10s 7 6 3.00000 1 90 4.00000 3.00000 25.0% 494 16s 10 8 3.00000 1 132 4.00000 3.00000 25.0% 346 21s 12 10 3.00000 1 175 4.00000 3.00000 25.0% 288 25s 16 12 3.00000 1 109 4.00000 3.00000 25.0% 216 31s 18 14 3.00000 1 98 4.00000 3.00000 25.0% 192 36s Cutting planes: Gomory: 36 Clique: 2 Zero half: 10 Explored 23 nodes (223213 simplex iterations) in 38.50 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%