Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:41:13 2012 Optimize a model with 11091 rows, 3540 columns and 36519 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.28s Presolved: 11089 rows, 3538 columns, 36143 nonzeros Variable types: 0 continuous, 3538 integer (3538 binary) Found heuristic solution: objective 59.0000000 Root relaxation: objective 2.000000e+00, 2619 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 118 59.00000 2.00000 96.6% - 0s H 0 0 56.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 616 5.00000 2.66667 46.7% - 1s H 0 0 4.0000000 2.66667 33.3% - 1s 0 0 2.66667 0 2499 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 274 4.00000 2.66667 33.3% - 4s 0 0 2.67857 0 2951 4.00000 2.67857 33.0% - 6s 0 0 2.67857 0 3013 4.00000 2.67857 33.0% - 7s 0 0 2.67857 0 2981 4.00000 2.67857 33.0% - 9s 0 0 2.67857 0 2904 4.00000 2.67857 33.0% - 11s 0 0 2.67857 0 2950 4.00000 2.67857 33.0% - 13s 0 0 2.67857 0 2928 4.00000 2.67857 33.0% - 15s 0 0 2.67857 0 2910 4.00000 2.67857 33.0% - 17s 0 0 2.67857 0 2973 4.00000 2.67857 33.0% - 20s 0 0 2.67857 0 2815 4.00000 2.67857 33.0% - 22s 0 0 2.67857 0 2826 4.00000 2.67857 33.0% - 24s 0 0 2.67857 0 2825 4.00000 2.67857 33.0% - 25s 0 1 3.00000 0 2825 4.00000 3.00000 25.0% - 31s Cutting planes: Clique: 141 Zero half: 13 Explored 6 nodes (74758 simplex iterations) in 32.37 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%