Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:38:33 2012 Optimize a model with 4814 rows, 2070 columns and 16288 nonzeros Presolve removed 992 rows and 2 columns Presolve time: 0.12s Presolved: 3822 rows, 2068 columns, 13778 nonzeros Variable types: 0 continuous, 2068 integer (2068 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 3.000000e+00, 3213 iterations, 0.30 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 217 45.00000 3.00000 93.3% - 0s H 0 0 39.0000000 3.00000 92.3% - 1s H 0 0 38.0000000 3.00000 92.1% - 1s H 0 0 7.0000000 3.00000 57.1% - 1s 0 0 3.00000 0 414 7.00000 3.00000 57.1% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 95 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 52 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 65 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 56 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 58 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 67 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 10s 0 2 3.00000 0 72 4.00000 3.00000 25.0% - 11s 5 5 3.00000 1 81 4.00000 3.00000 25.0% 745 15s 9 8 3.00000 1 89 4.00000 3.00000 25.0% 414 20s 14 13 3.00000 16 72 4.00000 3.00000 25.0% 4544 25s Cutting planes: Gomory: 7 Zero half: 17 Explored 27 nodes (134230 simplex iterations) in 28.37 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%