Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:31:58 2012 Optimize a model with 4576 rows, 1980 columns and 15532 nonzeros Presolve removed 925 rows and 44 columns Presolve time: 0.10s Presolved: 3651 rows, 1936 columns, 13464 nonzeros Variable types: 0 continuous, 1936 integer (1936 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.000000e+00, 3301 iterations, 0.23 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 42 23.00000 3.00000 87.0% - 0s H 0 0 5.0000000 3.00000 40.0% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 246 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 40 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 59 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 67 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 67 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 57 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 5s 0 2 3.00000 0 66 4.00000 3.00000 25.0% - 5s 9 8 3.00000 1 98 4.00000 3.00000 25.0% 229 10s Cutting planes: Gomory: 5 Zero half: 1 Explored 10 nodes (90466 simplex iterations) in 12.47 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%