Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:49:04 2012 Optimize a model with 4967 rows, 2162 columns and 16834 nonzeros Presolve removed 1014 rows and 2 columns Presolve time: 0.10s Presolved: 3999 rows, 2160 columns, 16432 nonzeros Variable types: 0 continuous, 2160 integer (2160 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 3.000000e+00, 3508 iterations, 0.34 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 129 46.00000 3.00000 93.5% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 74 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 7s 0 2 3.00000 0 85 4.00000 3.00000 25.0% - 9s 2 3 3.00000 1 85 4.00000 3.00000 25.0% 1619 10s 6 6 3.00000 1 248 4.00000 3.00000 25.0% 540 15s 9 8 3.00000 1 86 4.00000 3.00000 25.0% 360 21s 11 9 3.00000 1 88 4.00000 3.00000 25.0% 294 25s 17 13 3.00000 12 60 4.00000 3.00000 25.0% 4782 30s Cutting planes: Gomory: 1 Zero half: 11 Explored 26 nodes (134860 simplex iterations) in 32.55 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%