Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:25 2013 Optimize a model with 4320 rows, 12060 columns and 36100 nonzeros Presolve removed 20 rows and 20 columns Presolve time: 0.17s Presolved: 4300 rows, 12040 columns, 32080 nonzeros Variable types: 8040 continuous, 4000 integer (4000 binary) Root relaxation: objective 4.642213e+04, 578 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 46422.1265 0 6 - 46422.1265 - - 0s 0 0 46464.3521 0 6 - 46464.3521 - - 0s 0 0 46469.2557 0 4 - 46469.2557 - - 0s 0 0 46470.0163 0 4 - 46470.0163 - - 0s 0 0 46470.2153 0 4 - 46470.2153 - - 0s 0 0 46479.2628 0 8 - 46479.2628 - - 0s 0 0 46481.1078 0 7 - 46481.1078 - - 0s 0 0 46481.9131 0 6 - 46481.9131 - - 0s 0 0 46482.1257 0 7 - 46482.1257 - - 0s 0 0 46483.6117 0 6 - 46483.6117 - - 0s 0 0 46485.4911 0 5 - 46485.4911 - - 0s 0 0 46485.5285 0 4 - 46485.5285 - - 0s 0 0 46486.9588 0 8 - 46486.9588 - - 0s 0 0 46489.3311 0 8 - 46489.3311 - - 0s 0 0 46489.9491 0 7 - 46489.9491 - - 0s 0 0 46490.0864 0 7 - 46490.0864 - - 0s 0 0 46490.0864 0 7 - 46490.0864 - - 1s 0 2 46490.0864 0 7 - 46490.0864 - - 1s * 22 6 11 46743.813864 46743.8139 0.0% 31.7 1s Cutting planes: Gomory: 2 Implied bound: 45 Flow cover: 3 Explored 23 nodes (1618 simplex iterations) in 1.93 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.674381386351e+04, best bound 4.674381386351e+04, gap 0.0%