Gurobi 5.0.1 (linux64) logging started Sat Dec 8 03:32:32 2012 Optimize a model with 555 rows, 540 columns and 1776 nonzeros Presolve removed 88 rows and 56 columns Presolve time: 0.00s Presolved: 467 rows, 484 columns, 1555 nonzeros Variable types: 326 continuous, 158 integer (158 binary) Root relaxation: objective 5.186422e+04, 228 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 51864.2214 0 72 - 51864.2214 - - 0s 0 0 61195.5376 0 22 - 61195.5376 - - 0s 0 0 61721.8882 0 24 - 61721.8882 - - 0s 0 0 61812.5858 0 15 - 61812.5858 - - 0s 0 0 61824.0094 0 13 - 61824.0094 - - 0s 0 0 61842.6651 0 13 - 61842.6651 - - 0s 0 2 61843.1935 0 13 - 61843.1935 - - 0s * 52 41 41 62662.000000 61846.8217 1.30% 5.1 0s H 82 45 62368.000000 61862.6447 0.81% 4.8 0s H 109 38 62209.000000 61862.6930 0.56% 4.6 0s H 188 66 62133.000000 61890.9211 0.39% 4.4 1s 551 122 62095.8507 8 12 62133.0000 61993.1724 0.23% 4.7 5s H 571 51 62045.000000 61993.6210 0.08% 4.7 5s Cutting planes: Gomory: 16 Cover: 1 Flow cover: 57 Flow path: 44 Explored 631 nodes (3325 simplex iterations) in 5.68 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.204500000000e+04, best bound 6.203933320704e+04, gap 0.0091%