Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:30:40 2013 Optimize a model with 1500 rows, 51100 columns and 270850 nonzeros Presolve removed 50 rows and 5650 columns Presolve time: 0.40s Presolved: 1450 rows, 45450 columns, 250850 nonzeros Variable types: 45050 continuous, 400 integer (400 binary) Root relaxation: objective 2.198499e+05, 2775 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 219849.939 0 10 - 219849.939 - - 0s 0 0 219853.969 0 10 - 219853.969 - - 0s 0 0 219854.179 0 10 - 219854.179 - - 0s 0 0 219854.179 0 10 - 219854.179 - - 1s 0 0 219854.639 0 10 - 219854.639 - - 1s 0 0 219854.820 0 10 - 219854.820 - - 1s 0 0 219855.059 0 10 - 219855.059 - - 1s 0 0 219855.059 0 10 - 219855.059 - - 1s 0 2 219856.108 0 10 - 219856.108 - - 4s 32 34 220775.987 32 8 - 220220.935 - 27.4 5s * 180 153 162 226065.44517 220220.935 2.59% 13.8 7s * 215 129 38 222622.35999 220225.120 1.08% 14.9 8s 346 229 221523.350 18 5 222622.360 220259.265 1.06% 20.9 10s * 361 181 30 222101.60391 220259.265 0.83% 20.9 10s * 532 208 19 221990.70522 220600.593 0.63% 26.8 12s 656 213 221235.402 3 5 221990.705 220852.828 0.51% 31.6 15s 934 164 221751.991 16 5 221990.705 221355.382 0.29% 33.9 20s * 970 155 22 221990.67135 221393.205 0.27% 33.4 20s * 978 157 24 221988.56863 221411.977 0.26% 33.3 20s Cutting planes: Flow cover: 6 Explored 1209 nodes (40399 simplex iterations) in 23.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.219885686281e+05, best bound 2.219696364386e+05, gap 0.0085%