Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:24:29 2013 Optimize a model with 51191 rows, 50481 columns and 201711 nonzeros Presolve removed 1780 rows and 0 columns Presolve time: 0.31s Presolved: 49411 rows, 50481 columns, 198151 nonzeros Variable types: 50410 continuous, 71 integer (71 binary) Root relaxation: objective 7.925446e+04, 10389 iterations, 1.94 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 79254.4617 0 4 - 79254.4617 - - 2s H 0 0 81670.000000 79254.4617 2.96% - 2s 0 0 79259.4503 0 7 81670.0000 79259.4503 2.95% - 3s 0 0 79260.0386 0 7 81670.0000 79260.0386 2.95% - 3s 0 0 79260.0787 0 7 81670.0000 79260.0787 2.95% - 3s 0 2 79262.9959 0 7 81670.0000 79262.9959 2.95% - 5s H 2 2 80171.513629 79278.4473 1.11% 87.0 6s H 7 7 80159.106383 79376.9593 0.98% 248 6s H 10 9 79824.078157 79376.9593 0.56% 217 7s H 11 9 79755.030928 79376.9593 0.47% 210 7s H 12 10 79749.580392 79376.9593 0.47% 197 7s H 14 12 79728.111111 79376.9593 0.44% 176 7s * 16 9 14 79630.000000 79376.9593 0.32% 169 7s H 38 19 79618.000000 79393.3614 0.28% 122 8s * 39 12 11 79479.000000 79393.3614 0.11% 122 8s Cutting planes: Gomory: 2 Flow cover: 7 Explored 49 nodes (15552 simplex iterations) in 8.99 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.947900000000e+04, best bound 7.947325775910e+04, gap 0.0072%