Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:39:47 2013 Optimize a model with 39122 rows, 38502 columns and 153822 nonzeros Presolve removed 4500 rows and 0 columns Presolve time: 0.23s Presolved: 34622 rows, 38502 columns, 144822 nonzeros Variable types: 38440 continuous, 62 integer (62 binary) Root relaxation: objective 6.071535e+04, 6104 iterations, 0.82 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60715.3504 0 7 - 60715.3504 - - 1s H 0 0 63540.000000 60715.3504 4.45% - 1s 0 0 60726.7632 0 10 63540.0000 60726.7632 4.43% - 1s 0 0 60726.9143 0 10 63540.0000 60726.9143 4.43% - 1s H 0 0 61271.000000 60726.9143 0.89% - 2s 0 2 60736.1131 0 10 61271.0000 60736.1131 0.87% - 3s * 22 13 8 61235.000000 60886.1930 0.57% 65.5 4s * 39 10 9 61187.000000 60951.7420 0.38% 75.9 4s 50 0 cutoff 3 61187.0000 61187.0000 0.0% 75.5 5s Cutting planes: Gomory: 3 Flow cover: 4 Explored 51 nodes (9939 simplex iterations) in 5.00 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.118700000000e+04, best bound 6.118700000000e+04, gap 0.0%