Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:03:27 2012 Optimize a model with 8903 rows, 2862 columns and 29307 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.17s Presolved: 8954 rows, 2860 columns, 31780 nonzeros Variable types: 0 continuous, 2860 integer (2860 binary) Found heuristic solution: objective 53.0000000 Root relaxation: objective 2.000000e+00, 2094 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 106 53.00000 2.00000 96.2% - 0s H 0 0 52.0000000 2.00000 96.2% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 138 5.00000 2.66667 46.7% - 1s 0 0 2.67105 0 2530 5.00000 2.67105 46.6% - 1s 0 0 2.67105 0 2526 5.00000 2.67105 46.6% - 2s 0 0 2.67105 0 2522 5.00000 2.67105 46.6% - 2s 0 0 2.67105 0 2517 5.00000 2.67105 46.6% - 2s 0 0 2.67105 0 2522 5.00000 2.67105 46.6% - 3s 0 0 2.67105 0 2334 5.00000 2.67105 46.6% - 4s 0 0 2.67105 0 2223 5.00000 2.67105 46.6% - 4s 0 0 2.67105 0 2362 5.00000 2.67105 46.6% - 5s 0 0 2.67105 0 2280 5.00000 2.67105 46.6% - 6s 0 0 2.67105 0 2299 5.00000 2.67105 46.6% - 6s 0 0 2.67105 0 2296 5.00000 2.67105 46.6% - 7s 0 0 2.67105 0 2291 5.00000 2.67105 46.6% - 8s 0 0 2.67105 0 2289 5.00000 2.67105 46.6% - 9s 0 0 2.67105 0 2289 5.00000 2.67105 46.6% - 10s 0 0 2.67105 0 2288 5.00000 2.67105 46.6% - 11s 0 0 2.67105 0 2295 5.00000 2.67105 46.6% - 12s 0 0 2.67105 0 2295 5.00000 2.67105 46.6% - 12s H 0 0 4.0000000 2.67105 33.2% - 13s 0 2 2.80000 0 2295 4.00000 2.80000 30.0% - 14s Cutting planes: Clique: 81 Zero half: 4 Explored 13 nodes (32223 simplex iterations) in 14.73 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%