Gurobi 5.0.1 (linux64) logging started Sun Nov 18 08:01:13 2012 Optimize a model with 284 rows, 799 columns and 799 nonzeros Model has 566 quadratic constraints Presolve removed 0 rows and 15 columns Presolve time: 3.29s Presolved: 284 rows, 784 columns, 784 nonzeros Variable types: 566 continuous, 218 integer (217 binary) Root relaxation: objective 0.000000e+00, 83 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time H 0 0 144.0000000 - - - 3s 0 0 0.00000 0 65 144.00000 0.00000 100% - 3s 0 0 0.00000 0 85 144.00000 0.00000 100% - 3s 0 0 0.00000 0 64 144.00000 0.00000 100% - 3s 0 2 0.00000 0 64 144.00000 0.00000 100% - 3s H 37 37 32.0000000 1.22314 96.2% 50.2 3s * 37 37 27 30.0000000 1.22314 95.9% 50.3 3s H 108 82 28.0000000 1.56410 94.4% 31.7 3s H 109 74 25.0000000 1.56410 93.7% 31.5 3s H 147 91 23.0000000 3.45126 85.0% 31.0 3s H 274 146 22.0000000 5.51190 74.9% 29.3 3s H 284 138 21.0000000 5.51190 73.8% 29.7 3s 606 224 8.11896 11 480 21.00000 8.11896 61.3% 32.2 5s 2123 516 20.63694 33 402 21.00000 12.12105 42.3% 38.9 10s 4290 845 19.80311 36 472 21.00000 14.72000 29.9% 35.5 15s H 4462 762 20.0000000 14.83654 25.8% 35.2 15s 6280 279 18.25666 35 396 20.00000 17.43636 12.8% 35.7 20s Explored 6638 nodes (236842 simplex iterations) in 21.58 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%