Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:50:28 2012 Optimize a model with 9687 rows, 3192 columns and 31974 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.22s Presolved: 9685 rows, 3190 columns, 31628 nonzeros Variable types: 0 continuous, 3190 integer (3190 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 2.000000e+00, 2348 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 47.0000000 2.00000 95.7% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 200 5.00000 2.66667 46.7% - 1s 0 0 2.67500 0 2831 5.00000 2.67500 46.5% - 1s 0 0 2.67500 0 2809 5.00000 2.67500 46.5% - 2s 0 0 2.67500 0 2810 5.00000 2.67500 46.5% - 3s 0 0 2.67500 0 2667 5.00000 2.67500 46.5% - 4s 0 0 2.67500 0 2430 5.00000 2.67500 46.5% - 6s 0 0 2.67500 0 2363 5.00000 2.67500 46.5% - 7s 0 0 2.67500 0 2374 5.00000 2.67500 46.5% - 8s 0 0 2.67500 0 2338 5.00000 2.67500 46.5% - 8s 0 0 2.67500 0 2346 5.00000 2.67500 46.5% - 9s 0 0 2.67500 0 2325 5.00000 2.67500 46.5% - 10s 0 0 2.67500 0 2353 5.00000 2.67500 46.5% - 11s 0 0 2.67500 0 2342 5.00000 2.67500 46.5% - 12s 0 0 2.67500 0 2356 5.00000 2.67500 46.5% - 13s 0 0 2.67500 0 2356 5.00000 2.67500 46.5% - 13s 0 2 3.00000 0 2356 5.00000 3.00000 40.0% - 17s H 28 1 4.0000000 3.33333 16.7% 238 18s Cutting planes: Clique: 105 Zero half: 5 Explored 28 nodes (42212 simplex iterations) in 18.36 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%