Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:32:12 2012 Optimize a model with 4488 rows, 1980 columns and 15268 nonzeros Presolve removed 838 rows and 88 columns Presolve time: 0.10s Presolved: 3650 rows, 1892 columns, 13332 nonzeros Variable types: 0 continuous, 1892 integer (1892 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 3.000000e+00, 3724 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 46 21.00000 3.00000 85.7% - 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 66 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 79 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 73 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 46 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 46 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 75 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 50 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 8s 0 2 3.00000 0 44 4.00000 3.00000 25.0% - 8s 4 4 3.00000 1 56 4.00000 3.00000 25.0% 1067 10s 10 8 3.00000 1 99 4.00000 3.00000 25.0% 427 16s 16 10 3.00000 16 64 4.00000 3.00000 25.0% 3875 20s Cutting planes: Gomory: 3 Zero half: 5 Explored 19 nodes (137706 simplex iterations) in 20.95 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%