Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:58:20 2012 Optimize a model with 4944 rows, 2352 columns and 16992 nonzeros Presolve removed 529 rows and 48 columns Presolve time: 0.12s Presolved: 4415 rows, 2304 columns, 15696 nonzeros Variable types: 0 continuous, 2304 integer (2304 binary) Found heuristic solution: objective 30.0000000 Root relaxation: objective 3.000000e+00, 4188 iterations, 0.32 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 74 30.00000 3.00000 90.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 80 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 82 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 73 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 77 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 82 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 72 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 71 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 71 4.00000 3.00000 25.0% - 4s 0 2 3.00000 0 71 4.00000 3.00000 25.0% - 5s 7 6 3.00000 1 106 4.00000 3.00000 25.0% 207 12s 11 9 3.00000 15 58 4.00000 3.00000 25.0% 4077 15s Cutting planes: Gomory: 8 Zero half: 8 Explored 14 nodes (102326 simplex iterations) in 15.31 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%