Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:43:59 2013 Optimize a model with 680 rows, 45200 columns and 528420 nonzeros Presolve removed 20 rows and 980 columns Presolve time: 1.39s Presolved: 660 rows, 44220 columns, 488420 nonzeros Variable types: 44020 continuous, 200 integer (200 binary) Root relaxation: objective 3.860476e+04, 527 iterations, 0.05 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38604.7615 0 24 - 38604.7615 - - 1s 0 0 38605.4493 0 24 - 38605.4493 - - 2s 0 0 38605.4542 0 24 - 38605.4542 - - 2s 0 0 38605.4542 0 24 - 38605.4542 - - 2s H 0 0 41724.082830 38605.4542 7.47% - 2s H 0 0 39329.875266 38605.4542 1.84% - 4s 0 2 38605.4542 0 24 39329.8753 38605.4542 1.84% - 4s 37 29 39315.5024 31 3 39329.8753 38838.4159 1.25% 13.4 5s * 38 27 32 39315.529348 38838.4159 1.21% 13.1 5s * 56 9 15 38861.069269 38851.1992 0.03% 10.0 5s Cutting planes: Flow cover: 3 Explored 61 nodes (1635 simplex iterations) in 5.27 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.886106926871e+04, best bound 3.885817244320e+04, gap 0.0075%