Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:30:45 2012 Optimize a model with 12809 rows, 3782 columns and 41905 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.34s Presolved: 12868 rows, 3780 columns, 45206 nonzeros Variable types: 0 continuous, 3780 integer (3780 binary) Found heuristic solution: objective 61.0000000 Root relaxation: objective 2.000000e+00, 2503 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 0 122 61.00000 2.00000 96.7% - 0s H 0 0 59.0000000 2.00000 96.6% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 668 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 3402 5.00000 2.66667 46.7% - 3s 0 0 2.66667 0 540 5.00000 2.66667 46.7% - 12s 0 0 2.66667 0 155 5.00000 2.66667 46.7% - 20s H 0 0 4.0000000 2.66667 33.3% - 20s 0 0 2.67045 0 3071 4.00000 2.67045 33.2% - 28s 0 0 2.67045 0 3278 4.00000 2.67045 33.2% - 30s 0 0 2.67045 0 3238 4.00000 2.67045 33.2% - 37s 0 0 2.67045 0 3175 4.00000 2.67045 33.2% - 46s 0 0 2.67045 0 3214 4.00000 2.67045 33.2% - 54s 0 0 2.67045 0 3295 4.00000 2.67045 33.2% - 58s 0 0 2.67045 0 3231 4.00000 2.67045 33.2% - 65s 0 0 2.67045 0 3246 4.00000 2.67045 33.2% - 72s 0 0 2.67045 0 3064 4.00000 2.67045 33.2% - 80s 0 0 2.67045 0 3211 4.00000 2.67045 33.2% - 87s 0 0 2.67045 0 3211 4.00000 2.67045 33.2% - 90s 0 2 2.67045 0 3211 4.00000 2.67045 33.2% - 103s 1 3 3.00000 1 419 4.00000 2.67045 33.2% 16845 107s 5 3 cutoff 3 4.00000 3.00000 25.0% 4825 110s 6 2 cutoff 3 4.00000 3.00000 25.0% 6342 115s Cutting planes: Clique: 83 Zero half: 7 Explored 9 nodes (284481 simplex iterations) in 117.01 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%