Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:31:26 2012 Optimize a model with 4136 rows, 1980 columns and 14212 nonzeros Presolve removed 881 rows and 44 columns Presolve time: 0.09s Presolved: 3255 rows, 1936 columns, 12188 nonzeros Variable types: 0 continuous, 1936 integer (1936 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.000000e+00, 3280 iterations, 0.24 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 66 24.00000 3.00000 87.5% - 0s H 0 0 5.0000000 3.00000 40.0% - 0s 0 0 3.00000 0 119 5.00000 3.00000 40.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 42 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 46 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 67 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 40 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 42 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 59 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 59 4.00000 3.00000 25.0% - 4s 0 2 3.00000 0 44 4.00000 3.00000 25.0% - 4s 4 4 3.00000 1 66 4.00000 3.00000 25.0% 587 5s 9 8 3.00000 1 102 4.00000 3.00000 25.0% 261 10s 23 6 infeasible 20 4.00000 3.00000 25.0% 2252 15s Cutting planes: Gomory: 3 Zero half: 8 Explored 25 nodes (97121 simplex iterations) in 15.09 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%