Gurobi 5.0.1 (linux64) logging started Sun Nov 18 08:22:18 2012 Optimize a model with 304 rows, 842 columns and 842 nonzeros Model has 606 quadratic constraints Presolve removed 0 rows and 10 columns Presolve time: 3.58s Presolved: 304 rows, 832 columns, 832 nonzeros Variable types: 606 continuous, 226 integer (225 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 0 139.0000000 - - - 3s 0 0 0.00000 0 112 139.00000 0.00000 100% - 3s 0 0 0.00000 0 3 139.00000 0.00000 100% - 3s 0 0 0.00000 0 183 139.00000 0.00000 100% - 3s 0 2 0.00000 0 178 139.00000 0.00000 100% - 3s H 38 38 28.0000000 3.62338 87.1% 51.4 3s * 71 59 42 26.0000000 3.62338 86.1% 37.3 3s 601 328 17.50000 6 183 26.00000 11.21053 56.9% 28.2 7s * 1122 349 38 25.0000000 11.21053 55.2% 36.1 9s 1481 299 17.00000 26 495 25.00000 14.61053 41.6% 35.6 10s * 1728 204 37 24.0000000 16.11111 32.9% 35.2 10s H 1952 172 23.0000000 16.80000 27.0% 34.7 11s Explored 2530 nodes (88243 simplex iterations) in 12.55 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.300000000000e+01, best bound 2.300000000000e+01, gap 0.0%