Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:50:30 2012 Optimize a model with 11159 rows, 3906 columns and 37074 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.29s Presolved: 11219 rows, 3904 columns, 40558 nonzeros Variable types: 0 continuous, 3904 integer (3904 binary) Found heuristic solution: objective 62.0000000 Root relaxation: objective 2.000000e+00, 2853 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 124 62.00000 2.00000 96.8% - 0s H 0 0 58.0000000 2.00000 96.6% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 1195 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 3296 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 2s 0 0 2.66667 0 544 4.00000 2.66667 33.3% - 7s 0 0 2.66667 0 165 4.00000 2.66667 33.3% - 10s 0 0 2.67039 0 2885 4.00000 2.67039 33.2% - 14s 0 0 2.67039 0 2967 4.00000 2.67039 33.2% - 15s 0 0 2.67039 0 2889 4.00000 2.67039 33.2% - 18s 0 0 2.67039 0 2960 4.00000 2.67039 33.2% - 20s 0 0 2.67039 0 2961 4.00000 2.67039 33.2% - 22s 0 0 2.67039 0 2971 4.00000 2.67039 33.2% - 25s 0 0 2.67039 0 2967 4.00000 2.67039 33.2% - 28s 0 0 2.67039 0 2966 4.00000 2.67039 33.2% - 31s 0 0 2.67039 0 2966 4.00000 2.67039 33.2% - 34s 0 0 2.67039 0 2911 4.00000 2.67039 33.2% - 37s 0 2 2.80000 0 2911 4.00000 2.80000 30.0% - 48s 13 1 cutoff 1 4.00000 3.00000 25.0% 1178 50s Cutting planes: Clique: 50 Zero half: 10 Explored 15 nodes (129542 simplex iterations) in 51.34 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%