Gurobi 5.0.1 (linux64) logging started Wed Apr 24 16:53:08 2013 Optimize a model with 3740 rows, 1156340 columns and 2312340 nonzeros Presolve removed 0 rows and 0 columns (presolve time = 11s) ... Presolve time: 12.51s Presolved: 3740 rows, 1156340 columns, 2312340 nonzeros Variable types: 1156000 continuous, 340 integer (340 binary) Starting sifting (using dual simplex for sub-problems)... Iter Pivots Primal Obj Dual Obj Time 0 0 infinity 5.6220000e+04 0s 1 16994 2.0491819e+10 7.8998782e+04 1s 2 28716 9.0491684e+07 8.0399928e+04 1s 3 42123 1.4944694e+06 9.2073191e+04 1s 4 55705 1.0107514e+06 1.1060852e+05 1s 5 70935 9.3983119e+05 1.9562221e+05 2s 6 88053 8.7971846e+05 4.2837636e+05 2s 7 102271 8.7326826e+05 7.5782327e+05 3s 8 114193 8.6774131e+05 8.2164749e+05 3s 9 122617 8.6167848e+05 8.4271002e+05 3s 10 129310 8.6069277e+05 8.5885285e+05 4s Sifting complete Root relaxation: objective 8.606928e+05, 134017 iterations, 3.91 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 860692.768 0 4 - 860692.768 - - 17s H 0 0 909206.00000 860692.768 5.34% - 22s 0 0 861078.594 0 4 909206.000 861078.594 5.29% - 30s H 0 0 887171.00000 861078.594 2.94% - 31s 0 0 861183.331 0 4 887171.000 861183.331 2.93% - 34s 0 0 861183.331 0 4 887171.000 861183.331 2.93% - 56s H 0 0 881139.00000 861183.331 2.26% - 59s 0 0 861183.331 0 4 881139.000 861183.331 2.26% - 63s 0 0 861183.331 0 4 881139.000 861183.331 2.26% - 70s 0 0 861207.818 0 3 881139.000 861207.818 2.26% - 72s 0 0 861209.253 0 3 881139.000 861209.253 2.26% - 74s 0 0 861209.539 0 3 881139.000 861209.539 2.26% - 76s 0 0 861209.539 0 3 881139.000 861209.539 2.26% - 78s 0 2 861218.607 0 3 881139.000 861218.607 2.26% - 89s 1 3 861731.468 1 1 881139.000 861547.303 2.22% 1178 95s 2 4 861620.647 1 3 881139.000 861620.647 2.22% 1106 101s H 4 4 864974.00000 861639.745 0.39% 566 104s H 5 5 864266.00000 861639.745 0.30% 483 104s H 6 6 863999.00000 861639.745 0.27% 445 105s 10 10 861913.397 9 2 863999.000 861639.745 0.27% 347 110s H 17 12 863447.00000 861639.745 0.21% 238 114s 18 14 862155.027 17 2 863447.000 861639.745 0.21% 228 115s H 19 13 862790.00000 861639.745 0.13% 216 115s H 21 12 862571.00000 861639.745 0.11% 197 116s H 23 14 862514.00000 861639.745 0.10% 182 116s H 25 13 862511.00000 861639.745 0.10% 170 117s * 26 12 23 862469.00000 861639.745 0.10% 164 117s 30 13 862119.615 4 1 862469.000 861693.994 0.09% 190 121s 38 13 862133.661 4 1 862469.000 861808.671 0.08% 197 126s 43 11 861852.418 2 3 862469.000 861852.418 0.07% 207 130s 48 15 862421.889 6 1 862469.000 861867.954 0.07% 218 135s 61 15 862168.195 7 1 862469.000 861956.000 0.06% 196 140s H 62 14 862431.00000 861956.000 0.06% 193 140s * 67 18 12 862426.00000 861956.000 0.05% 181 141s 77 14 cutoff 9 862426.000 861996.859 0.05% 175 145s 85 10 cutoff 11 862426.000 862184.286 0.03% 181 150s Cutting planes: Implied bound: 203 Flow cover: 2 Explored 92 nodes (186193 simplex iterations) in 152.56 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.624260000000e+05, best bound 8.623890000000e+05, gap 0.0043%