Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:53:53 2012 Optimize a model with 9687 rows, 3192 columns and 31974 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.22s Presolved: 9741 rows, 3190 columns, 34764 nonzeros Variable types: 0 continuous, 3190 integer (3190 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 2.000000e+00, 2447 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 112 56.00000 2.00000 96.4% - 0s H 0 0 53.0000000 2.00000 96.2% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 1094 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 689 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 486 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 3s 0 0 2.67925 0 2667 4.00000 2.67925 33.0% - 3s 0 0 2.67925 0 2645 4.00000 2.67925 33.0% - 4s 0 0 2.67925 0 2651 4.00000 2.67925 33.0% - 5s 0 0 2.67925 0 2328 4.00000 2.67925 33.0% - 7s 0 0 2.67925 0 2329 4.00000 2.67925 33.0% - 8s 0 0 2.67925 0 2261 4.00000 2.67925 33.0% - 9s 0 0 2.67925 0 2239 4.00000 2.67925 33.0% - 10s 0 0 2.67925 0 2244 4.00000 2.67925 33.0% - 12s 0 0 2.67925 0 2273 4.00000 2.67925 33.0% - 13s 0 0 2.67925 0 2249 4.00000 2.67925 33.0% - 14s 0 0 2.67925 0 2286 4.00000 2.67925 33.0% - 15s 0 0 2.67925 0 2286 4.00000 2.67925 33.0% - 16s 0 1 3.00000 0 2286 4.00000 3.00000 25.0% - 20s Cutting planes: Clique: 141 Zero half: 6 Explored 12 nodes (47000 simplex iterations) in 21.21 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%