Gurobi 5.0.1 (linux64) logging started Fri Nov 16 09:46:52 2012 Optimize a model with 13534 rows, 4556 columns and 44890 nonzeros Presolve time: 0.11s Presolved: 13534 rows, 4556 columns, 45040 nonzeros Variable types: 0 continuous, 4556 integer (4556 binary) Found heuristic solution: objective 38.0000000 Root relaxation: objective 2.000000e+00, 4862 iterations, 0.20 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 134 38.00000 2.00000 94.7% - 1s H 0 0 15.0000000 2.00000 86.7% - 1s H 0 0 4.0000000 2.00000 50.0% - 1s 0 0 2.00000 0 134 4.00000 2.00000 50.0% - 2s 0 0 2.00000 0 134 4.00000 2.00000 50.0% - 8s 0 0 2.00000 0 134 4.00000 2.00000 50.0% - 15s 0 0 2.00000 0 134 4.00000 2.00000 50.0% - 22s 0 0 2.00000 0 134 4.00000 2.00000 50.0% - 28s 0 0 2.00000 0 134 4.00000 2.00000 50.0% - 34s 0 2 2.00000 0 134 4.00000 2.00000 50.0% - 61s 1 3 2.50000 1 221 4.00000 2.00000 50.0% 29085 67s 2 4 2.50000 1 716 4.00000 2.50000 37.5% 27734 78s 3 5 2.66667 2 187 4.00000 2.50000 37.5% 20542 81s 13 7 3.00000 4 165 4.00000 2.50000 37.5% 5811 85s 39 5 3.00000 2 203 4.00000 2.50000 37.5% 2541 91s 55 7 2.66667 4 340 4.00000 2.66667 33.3% 2016 96s 82 9 3.00000 6 144 4.00000 2.66667 33.3% 1495 100s Cutting planes: Clique: 112 Zero half: 7 Explored 100 nodes (214587 simplex iterations) in 100.96 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%