Gurobi 5.0.1 (linux64) logging started Fri Nov 16 08:34:58 2012 Optimize a model with 12927 rows, 4160 columns and 42622 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.38s Presolved: 12925 rows, 4158 columns, 42218 nonzeros Variable types: 0 continuous, 4158 integer (4158 binary) Found heuristic solution: objective 63.0000000 Root relaxation: objective 2.000000e+00, 3128 iterations, 0.11 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 128 63.00000 2.00000 96.8% - 0s H 0 0 60.0000000 2.00000 96.7% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 1101 4.00000 2.66667 33.3% - 3s 0 0 2.66667 0 2408 4.00000 2.66667 33.3% - 3s 0 0 2.66667 0 168 4.00000 2.66667 33.3% - 7s 0 0 2.67027 0 3641 4.00000 2.67027 33.2% - 9s 0 0 2.67027 0 3622 4.00000 2.67027 33.2% - 10s 0 0 2.67027 0 3618 4.00000 2.67027 33.2% - 10s 0 0 2.67027 0 3623 4.00000 2.67027 33.2% - 10s 0 0 2.67027 0 3453 4.00000 2.67027 33.2% - 12s 0 0 2.67027 0 3458 4.00000 2.67027 33.2% - 13s 0 0 2.67027 0 3494 4.00000 2.67027 33.2% - 15s 0 0 2.67027 0 3502 4.00000 2.67027 33.2% - 16s 0 0 2.67027 0 3553 4.00000 2.67027 33.2% - 17s 0 0 2.67027 0 3553 4.00000 2.67027 33.2% - 18s 0 2 2.80000 0 3553 4.00000 2.80000 30.0% - 26s 10 0 cutoff 1 4.00000 4.00000 0.0% 2470 32s Cutting planes: Clique: 92 Zero half: 18 Explored 11 nodes (75469 simplex iterations) in 32.30 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%