Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:37:13 2013 Optimize a model with 671 rows, 37271 columns and 74481 nonzeros Presolve time: 0.05s Presolved: 671 rows, 37271 columns, 74481 nonzeros Variable types: 37210 continuous, 61 integer (61 binary) Root relaxation: objective 5.428702e+04, 1033 iterations, 0.03 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54287.0219 0 7 - 54287.0219 - - 0s H 0 0 57185.000000 54287.0219 5.07% - 0s 0 0 54578.7359 0 6 57185.0000 54578.7359 4.56% - 0s H 0 0 56955.446206 54578.7359 4.17% - 0s H 0 0 56547.000000 54578.7359 3.48% - 0s H 0 0 55034.000000 54578.7359 0.83% - 0s 0 0 54591.4462 0 6 55034.0000 54591.4462 0.80% - 0s 0 0 54607.0280 0 7 55034.0000 54607.0280 0.78% - 0s 0 0 54619.8922 0 6 55034.0000 54619.8922 0.75% - 0s 0 0 54622.9477 0 5 55034.0000 54622.9477 0.75% - 0s 0 0 54623.8590 0 5 55034.0000 54623.8590 0.75% - 0s 0 0 54624.6754 0 5 55034.0000 54624.6754 0.74% - 0s H 0 0 54838.000000 54624.6754 0.39% - 0s 0 0 54624.6754 0 6 54838.0000 54624.6754 0.39% - 0s 0 0 54624.6754 0 6 54838.0000 54624.6754 0.39% - 1s 0 0 54624.6754 0 6 54838.0000 54624.6754 0.39% - 1s 0 0 54624.6754 0 7 54838.0000 54624.6754 0.39% - 1s 0 0 54624.6754 0 6 54838.0000 54624.6754 0.39% - 1s 0 0 54624.6754 0 7 54838.0000 54624.6754 0.39% - 1s 0 0 54624.6754 0 5 54838.0000 54624.6754 0.39% - 1s 0 0 54624.6754 0 5 54838.0000 54624.6754 0.39% - 1s 0 0 54624.8341 0 5 54838.0000 54624.8341 0.39% - 1s 0 2 54626.2543 0 5 54838.0000 54626.2543 0.39% - 1s Cutting planes: Implied bound: 124 Flow cover: 9 Explored 17 nodes (3449 simplex iterations) in 1.73 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.483800000000e+04, best bound 5.483800000000e+04, gap 0.0%