Gurobi 5.0.1 (linux64) logging started Sat Dec 8 02:35:13 2012 Optimize a model with 285 rows, 270 columns and 888 nonzeros Presolve removed 21 rows and 12 columns Presolve time: 0.00s Presolved: 264 rows, 258 columns, 840 nonzeros Variable types: 171 continuous, 87 integer (87 binary) Root relaxation: objective 2.314990e+04, 131 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 23149.8978 0 46 - 23149.8978 - - 0s H 0 0 37557.000000 23149.8978 38.4% - 0s 0 0 28508.9623 0 4 37557.0000 28508.9623 24.1% - 0s H 0 0 28784.000000 28508.9623 0.96% - 0s 0 0 28538.5169 0 4 28784.0000 28538.5169 0.85% - 0s 0 2 28539.1057 0 4 28784.0000 28539.1057 0.85% - 0s * 17 13 16 28684.000000 28541.7132 0.50% 1.9 0s * 37 7 16 28630.000000 28573.4480 0.20% 2.2 0s * 41 2 11 28597.000000 28590.6933 0.02% 2.1 0s Cutting planes: Gomory: 13 Cover: 1 Flow cover: 24 Flow path: 12 Explored 43 nodes (280 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.859700000000e+04, best bound 2.859553860028e+04, gap 0.0051%