Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:00:12 2013 Optimize a model with 1800 rows, 27150 columns and 57250 nonzeros Presolve removed 50 rows and 50 columns Presolve time: 0.19s Presolved: 1750 rows, 27100 columns, 56200 nonzeros Variable types: 26100 continuous, 1000 integer (1000 binary) Root relaxation: objective 1.824192e+05, 2578 iterations, 0.11 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 182419.206 0 2 - 182419.206 - - 0s H 0 0 199449.94651 182419.206 8.54% - 0s H 0 0 189919.48160 182419.206 3.95% - 0s 0 0 182445.503 0 4 189919.482 182445.503 3.94% - 0s 0 0 182457.257 0 4 189919.482 182457.257 3.93% - 0s 0 0 182462.623 0 4 189919.482 182462.623 3.93% - 0s 0 0 182464.130 0 4 189919.482 182464.130 3.93% - 0s 0 0 182464.534 0 4 189919.482 182464.534 3.93% - 0s 0 0 182465.547 0 4 189919.482 182465.547 3.92% - 0s 0 0 182467.528 0 4 189919.482 182467.528 3.92% - 1s 0 0 182467.528 0 4 189919.482 182467.528 3.92% - 1s 0 0 182467.528 0 4 189919.482 182467.528 3.92% - 1s 0 2 182467.528 0 4 189919.482 182467.528 3.92% - 1s H 27 13 183432.05005 182868.601 0.31% 103 2s * 36 5 19 183173.63373 182873.963 0.16% 80.1 2s H 54 4 183134.75412 182873.963 0.14% 54.6 2s H 81 0 182890.87169 182873.963 0.01% 37.8 3s Cutting planes: Implied bound: 3 Flow cover: 9 Explored 81 nodes (6233 simplex iterations) in 3.12 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.828908716887e+05, best bound 1.828739634088e+05, gap 0.0092%