Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:30:20 2012 Optimize a model with 4858 rows, 1892 columns and 16252 nonzeros Presolve removed 1421 rows and 2 columns Presolve time: 0.11s Presolved: 3480 rows, 1890 columns, 14630 nonzeros Variable types: 0 continuous, 1890 integer (1890 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 3.000000e+00, 3070 iterations, 0.35 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 784 43.00000 3.00000 93.0% - 1s H 0 0 39.0000000 3.00000 92.3% - 1s H 0 0 15.0000000 3.00000 80.0% - 1s H 0 0 14.0000000 3.00000 78.6% - 1s 0 0 3.00000 0 828 14.00000 3.00000 78.6% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 80 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 4s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 111 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 109 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 173 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 11s 0 2 3.00000 0 109 4.00000 3.00000 25.0% - 13s 4 4 3.00000 1 435 4.00000 3.00000 25.0% 516 16s 7 6 3.00000 1 105 4.00000 3.00000 25.0% 295 20s 10 8 3.00000 1 94 4.00000 3.00000 25.0% 207 25s Cutting planes: Gomory: 2 Zero half: 18 Explored 15 nodes (109475 simplex iterations) in 27.97 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%