Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:43:44 2013 Optimize a model with 2600 rows, 102300 columns and 207500 nonzeros Presolve removed 200 rows and 200 columns Presolve time: 0.77s Presolved: 2400 rows, 102100 columns, 206800 nonzeros Variable types: 101200 continuous, 900 integer (900 binary) Root relaxation: objective 9.053666e+05, 6158 iterations, 0.66 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 905366.638 0 2 - 905366.638 - - 1s H 0 0 1029085.9837 905366.638 12.0% - 1s 0 0 905392.638 0 2 1029085.98 905392.638 12.0% - 2s 0 0 905442.338 0 2 1029085.98 905442.338 12.0% - 2s 0 0 905442.338 0 2 1029085.98 905442.338 12.0% - 3s H 0 0 909956.07103 905442.338 0.50% - 3s 0 0 905443.584 0 2 909956.071 905443.584 0.50% - 4s 0 0 905448.949 0 2 909956.071 905448.949 0.50% - 4s 0 0 905452.917 0 2 909956.071 905452.917 0.49% - 5s 0 0 905459.224 0 2 909956.071 905459.224 0.49% - 5s 0 0 905459.933 0 2 909956.071 905459.933 0.49% - 5s 0 0 905460.976 0 2 909956.071 905460.976 0.49% - 6s 0 0 905461.316 0 2 909956.071 905461.316 0.49% - 6s 0 0 905461.316 0 2 909956.071 905461.316 0.49% - 7s 0 2 905472.944 0 2 909956.071 905472.944 0.49% - 8s 5 7 906814.961 5 1 909956.071 906246.549 0.41% 126 10s * 20 13 19 908006.29248 906246.549 0.19% 71.5 12s 27 12 906836.697 6 1 908006.292 906347.749 0.18% 93.4 15s 42 11 cutoff 4 908006.292 907197.434 0.09% 113 20s Cutting planes: Flow cover: 21 Explored 76 nodes (14659 simplex iterations) in 24.83 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 9.080062924750e+05, best bound 9.079314176590e+05, gap 0.0082%