Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:42:13 2012 Optimize a model with 247 rows, 712 columns and 712 nonzeros Model has 492 quadratic constraints Presolve removed 0 rows and 25 columns Presolve time: 2.87s Presolved: 247 rows, 687 columns, 687 nonzeros Variable types: 492 continuous, 195 integer (194 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 0 128.0000000 - - - 2s 0 0 0.00000 0 109 128.00000 0.00000 100% - 2s 0 0 0.00000 0 176 128.00000 0.00000 100% - 2s 0 0 0.00000 0 138 128.00000 0.00000 100% - 2s 0 2 0.00000 0 138 128.00000 0.00000 100% - 2s H 54 54 19.0000000 2.36667 87.5% 32.0 3s * 77 58 47 18.0000000 2.36667 86.9% 31.3 3s * 261 135 28 17.0000000 5.72231 66.3% 22.5 3s 688 251 11.08844 20 576 17.00000 9.00000 47.1% 33.6 5s 2591 427 11.86592 37 420 17.00000 9.66197 43.2% 40.5 10s 5517 737 cutoff 37 17.00000 12.64516 25.6% 32.8 15s * 8202 312 50 16.0000000 14.07956 12.0% 29.5 19s Explored 8546 nodes (251132 simplex iterations) in 19.54 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.600000000000e+01, best bound 1.600000000000e+01, gap 0.0%