Gurobi 5.0.1 (linux64) logging started Sat Dec 8 03:32:59 2012 Optimize a model with 555 rows, 540 columns and 1770 nonzeros Presolve removed 63 rows and 36 columns Presolve time: 0.00s Presolved: 492 rows, 504 columns, 1626 nonzeros Variable types: 333 continuous, 171 integer (171 binary) Root relaxation: objective 4.663160e+04, 246 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 46631.6009 0 80 - 46631.6009 - - 0s H 0 0 89449.000000 46631.6009 47.9% - 0s 0 0 55473.9146 0 33 89449.0000 55473.9146 38.0% - 0s H 0 0 62547.000000 55473.9146 11.3% - 0s 0 0 55884.9106 0 30 62547.0000 55884.9106 10.7% - 0s 0 0 55947.2026 0 15 62547.0000 55947.2026 10.6% - 0s 0 0 55958.4934 0 16 62547.0000 55958.4934 10.5% - 0s 0 2 55958.5161 0 16 62547.0000 55958.5161 10.5% - 0s H 27 27 59140.000000 55984.8335 5.34% 9.5 0s H 54 54 58070.000000 55984.8335 3.59% 8.6 0s * 74 59 62 57892.000000 55984.8335 3.29% 7.4 0s H 120 68 56732.000000 55986.0610 1.31% 7.6 0s H 166 70 56582.000000 55997.3712 1.03% 7.2 1s * 170 55 40 56491.000000 55997.3712 0.87% 7.1 1s H 201 57 56360.000000 55999.1785 0.64% 7.1 1s * 205 49 31 56269.000000 55999.1785 0.48% 7.0 1s 597 99 cutoff 12 56269.0000 56123.8068 0.26% 8.0 5s Cutting planes: Gomory: 18 Cover: 1 Implied bound: 1 Flow cover: 84 Flow path: 53 Explored 921 nodes (7720 simplex iterations) in 8.31 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.626900000000e+04, best bound 5.626638596980e+04, gap 0.0046%