Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:50:40 2013 Optimize a model with 560 rows, 6200 columns and 26500 nonzeros Presolve removed 20 rows and 20 columns Presolve time: 0.04s Presolved: 540 rows, 6180 columns, 24480 nonzeros Variable types: 6040 continuous, 140 integer (140 binary) Root relaxation: objective 3.894400e+04, 595 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38944.0027 0 6 - 38944.0027 - - 0s 0 0 38950.2947 0 6 - 38950.2947 - - 0s 0 0 38950.9144 0 9 - 38950.9144 - - 0s 0 0 38950.9144 0 9 - 38950.9144 - - 0s 0 0 38950.9144 0 9 - 38950.9144 - - 0s H 0 0 42821.336326 38950.9144 9.04% - 0s 0 2 38969.5686 0 9 42821.3363 38969.5686 8.99% - 0s H 27 16 39305.726351 39228.1603 0.20% 7.0 0s * 50 12 21 39247.713225 39236.7928 0.03% 5.4 0s Cutting planes: Flow cover: 6 Explored 57 nodes (1031 simplex iterations) in 0.66 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.924771322516e+04, best bound 3.924380924762e+04, gap 0.0099%