Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:47:17 2013 Optimize a model with 41664 rows, 41024 columns and 163904 nonzeros Presolve removed 1712 rows and 0 columns Presolve time: 0.24s Presolved: 39952 rows, 41024 columns, 160480 nonzeros Variable types: 40960 continuous, 64 integer (64 binary) Root relaxation: objective 7.530170e+04, 9692 iterations, 1.73 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 75301.6976 0 4 - 75301.6976 - - 2s H 0 0 78450.000000 75301.6976 4.01% - 2s H 0 0 78314.000000 75301.6976 3.85% - 2s 0 0 75309.3485 0 5 78314.0000 75309.3485 3.84% - 2s H 0 0 77709.000000 75309.3485 3.09% - 2s 0 0 75310.1139 0 6 77709.0000 75310.1139 3.09% - 3s 0 0 75310.1739 0 5 77709.0000 75310.1739 3.09% - 3s H 0 0 77543.200000 75310.1739 2.88% - 4s H 0 0 76608.600000 75310.1739 1.69% - 4s H 0 0 76331.000000 75310.1739 1.34% - 4s 0 2 75310.9053 0 5 76331.0000 75310.9053 1.34% - 4s 2 4 75335.9614 2 6 76331.0000 75335.9614 1.30% 91.5 5s H 12 12 76054.304348 75341.2742 0.94% 60.2 5s H 13 13 75782.571429 75341.2742 0.58% 62.0 5s * 23 10 22 75587.000000 75341.2742 0.33% 48.2 5s H 26 9 75550.933333 75391.1415 0.21% 50.2 6s * 27 10 7 75510.000000 75391.1415 0.16% 49.5 6s H 32 2 75458.000000 75419.1686 0.05% 50.8 6s Cutting planes: Gomory: 2 Flow cover: 5 Explored 35 nodes (11599 simplex iterations) in 6.36 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.545800000000e+04, best bound 7.545346765331e+04, gap 0.0060%