Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:07:20 2012 Optimize a model with 14765 rows, 4830 columns and 48781 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.48s Presolved: 14832 rows, 4828 columns, 53114 nonzeros Variable types: 0 continuous, 4828 integer (4828 binary) Found heuristic solution: objective 69.0000000 Root relaxation: objective 2.000000e+00, 3396 iterations, 0.14 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 138 69.00000 2.00000 97.1% - 0s H 0 0 63.0000000 2.00000 96.8% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 3480 5.00000 2.66667 46.7% - 5s 0 0 2.66667 0 1933 5.00000 2.66667 46.7% - 6s H 0 0 4.0000000 2.66667 33.3% - 6s 0 0 2.66667 0 1631 4.00000 2.66667 33.3% - 7s 0 0 2.67337 0 4136 4.00000 2.67337 33.2% - 9s 0 0 2.67337 0 4115 4.00000 2.67337 33.2% - 10s 0 0 2.67337 0 4106 4.00000 2.67337 33.2% - 11s 0 0 2.67337 0 4108 4.00000 2.67337 33.2% - 12s 0 0 2.67337 0 3550 4.00000 2.67337 33.2% - 15s 0 0 2.67337 0 3395 4.00000 2.67337 33.2% - 18s 0 0 2.67337 0 3388 4.00000 2.67337 33.2% - 19s 0 0 2.67337 0 3381 4.00000 2.67337 33.2% - 21s 0 0 2.67337 0 3363 4.00000 2.67337 33.2% - 23s 0 0 2.67337 0 3365 4.00000 2.67337 33.2% - 24s 0 0 2.67337 0 3296 4.00000 2.67337 33.2% - 27s 0 0 2.67337 0 3300 4.00000 2.67337 33.2% - 28s 0 0 2.67337 0 3327 4.00000 2.67337 33.2% - 29s 0 0 2.67337 0 3314 4.00000 2.67337 33.2% - 31s 0 0 2.67337 0 3299 4.00000 2.67337 33.2% - 34s 0 0 2.67337 0 3302 4.00000 2.67337 33.2% - 36s 0 0 2.67337 0 3302 4.00000 2.67337 33.2% - 37s 0 1 3.00000 0 3302 4.00000 3.00000 25.0% - 51s Cutting planes: Clique: 120 Zero half: 16 Explored 8 nodes (86813 simplex iterations) in 51.78 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%