Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:16:55 2013 Optimize a model with 61698 rows, 60918 columns and 243438 nonzeros Presolve removed 1370 rows and 0 columns Presolve time: 0.39s Presolved: 60328 rows, 60918 columns, 240698 nonzeros Variable types: 60840 continuous, 78 integer (78 binary) Root relaxation: objective 8.838939e+04, 11303 iterations, 2.35 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 88389.3876 0 4 - 88389.3876 - - 2s H 0 0 91834.000000 88389.3876 3.75% - 3s 0 0 88392.9071 0 6 91834.0000 88392.9071 3.75% - 3s 0 0 88392.9071 0 6 91834.0000 88392.9071 3.75% - 4s 0 0 88392.9071 0 6 91834.0000 88392.9071 3.75% - 4s H 0 0 88905.800000 88392.9071 0.58% - 6s H 0 0 88816.000000 88392.9071 0.48% - 6s 0 0 88392.9071 0 4 88816.0000 88392.9071 0.48% - 8s 0 0 88393.0413 0 6 88816.0000 88393.0413 0.48% - 9s 0 0 88393.0413 0 6 88816.0000 88393.0413 0.48% - 9s 0 2 88394.8034 0 6 88816.0000 88394.8034 0.47% - 10s H 8 7 88774.720930 88504.6185 0.30% 96.4 11s H 9 8 88767.000000 88504.6185 0.30% 93.4 11s H 11 10 88726.733333 88504.6185 0.25% 79.3 11s * 14 11 10 88709.000000 88504.6185 0.23% 72.0 11s H 21 6 88598.733333 88545.6221 0.06% 76.0 12s * 24 4 8 88591.000000 88545.6221 0.05% 68.5 12s Cutting planes: Gomory: 2 Flow cover: 9 Explored 29 nodes (17872 simplex iterations) in 12.25 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.859100000000e+04, best bound 8.859100000000e+04, gap 0.0%