Gurobi 5.0.1 (linux64) logging started Fri Nov 16 08:50:31 2012 Optimize a model with 13000 rows, 4290 columns and 43030 nonzeros Presolve time: 0.10s Presolved: 13000 rows, 4290 columns, 43246 nonzeros Variable types: 0 continuous, 4290 integer (4290 binary) Found heuristic solution: objective 38.0000000 Root relaxation: objective 2.000000e+00, 4202 iterations, 0.18 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 130 38.00000 2.00000 94.7% - 1s H 0 0 14.0000000 2.00000 85.7% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.00000 0 130 5.00000 2.00000 60.0% - 2s 0 0 2.00000 0 130 5.00000 2.00000 60.0% - 7s 0 0 2.00000 0 130 5.00000 2.00000 60.0% - 13s H 0 0 4.0000000 2.00000 50.0% - 14s 0 0 2.00000 0 130 4.00000 2.00000 50.0% - 19s 0 0 2.00000 0 130 4.00000 2.00000 50.0% - 25s 0 0 2.00000 0 130 4.00000 2.00000 50.0% - 32s 0 2 2.00000 0 130 4.00000 2.00000 50.0% - 56s 1 3 3.00000 1 597 4.00000 2.00000 50.0% 31530 65s 2 4 3.00000 1 910 4.00000 3.00000 25.0% 87551 121s 6 4 cutoff 3 4.00000 3.00000 25.0% 30698 125s 9 3 cutoff 4 4.00000 3.00000 25.0% 21916 130s 16 4 3.00000 3 124 4.00000 3.00000 25.0% 13099 135s 20 2 cutoff 4 4.00000 3.00000 25.0% 11256 140s 27 3 3.00000 3 565 4.00000 3.00000 25.0% 8859 145s Cutting planes: Clique: 163 Explored 33 nodes (329898 simplex iterations) in 147.53 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%