Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:02:13 2013 Optimize a model with 19844 rows, 19404 columns and 77484 nonzeros Presolve removed 973 rows and 0 columns Presolve time: 0.11s Presolved: 18871 rows, 19404 columns, 75538 nonzeros Variable types: 19360 continuous, 44 integer (44 binary) Root relaxation: objective 3.891404e+04, 2437 iterations, 0.19 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38914.0398 0 4 - 38914.0398 - - 0s H 0 0 39261.000000 38914.0398 0.88% - 0s H 0 0 39145.000000 38914.0398 0.59% - 0s 0 0 38919.4886 0 6 39145.0000 38919.4886 0.58% - 0s 0 0 38919.4886 0 6 39145.0000 38919.4886 0.58% - 0s 0 0 39112.6286 0 3 39145.0000 39112.6286 0.08% - 0s 0 0 39112.6286 0 3 39145.0000 39112.6286 0.08% - 1s 0 0 39124.9571 0 2 39145.0000 39124.9571 0.05% - 1s 0 0 39130.8299 0 3 39145.0000 39130.8299 0.04% - 1s 0 0 39130.8299 0 3 39145.0000 39130.8299 0.04% - 1s 0 0 39136.7368 0 1 39145.0000 39136.7368 0.02% - 1s 0 2 39142.5214 0 1 39145.0000 39142.5214 0.01% - 1s Cutting planes: Gomory: 1 Flow cover: 1 Explored 1 nodes (3688 simplex iterations) in 1.51 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.914500000000e+04, best bound 3.914252142857e+04, gap 0.0063%