Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:05:59 2013 Optimize a model with 22607 rows, 22137 columns and 88407 nonzeros Presolve removed 976 rows and 0 columns Presolve time: 0.12s Presolved: 21631 rows, 22137 columns, 86455 nonzeros Variable types: 22090 continuous, 47 integer (47 binary) Root relaxation: objective 5.187878e+04, 3364 iterations, 0.29 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 51878.7773 0 4 - 51878.7773 - - 0s H 0 0 52240.000000 51878.7773 0.69% - 0s 0 0 51880.9458 0 5 52240.0000 51880.9458 0.69% - 0s 0 0 51881.1282 0 5 52240.0000 51881.1282 0.69% - 0s 0 0 51881.1282 0 5 52240.0000 51881.1282 0.69% - 0s H 0 0 52113.000000 51881.1282 0.44% - 1s 0 0 51881.1282 0 4 52113.0000 51881.1282 0.44% - 1s 0 0 51881.1282 0 5 52113.0000 51881.1282 0.44% - 1s 0 0 51881.6375 0 5 52113.0000 51881.6375 0.44% - 1s 0 0 51881.6375 0 5 52113.0000 51881.6375 0.44% - 1s 0 2 51882.2206 0 5 52113.0000 51882.2206 0.44% - 2s H 6 4 51933.432432 51915.8150 0.03% 22.0 2s H 7 4 51921.808642 51915.8150 0.01% 19.3 2s * 8 2 6 51918.000000 51915.8150 0.00% 18.4 2s Cutting planes: Gomory: 1 Flow cover: 6 Explored 9 nodes (5749 simplex iterations) in 2.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.191800000000e+04, best bound 5.191581498612e+04, gap 0.0042%