Gurobi 5.0.1 (linux64) logging started Wed Nov 28 03:52:29 2012 Optimize a model with 55026 rows, 54948 columns and 216828 nonzeros Presolve removed 1454 rows and 1454 columns Presolve time: 0.35s Presolved: 53572 rows, 53494 columns, 213920 nonzeros Variable types: 52012 continuous, 1482 integer (1482 binary) Found heuristic solution: objective 6867.0000000 Found heuristic solution: objective 2906.0000000 Found heuristic solution: objective 2492.0000000 Root simplex log... Iteration Objective Primal Inf. Dual Inf. Time 32010 1.5140003e+03 1.000000e+02 0.000000e+00 5s 41743 1.5143333e+03 0.000000e+00 0.000000e+00 8s Root relaxation: objective 1.514333e+03, 41743 iterations, 7.83 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 1514.33333 0 33 2492.00000 1514.33333 39.2% - 8s H 0 0 1630.0000000 1514.33333 7.10% - 8s H 0 0 1574.0000000 1514.33333 3.79% - 8s 0 0 1516.00000 0 32 1574.00000 1516.00000 3.68% - 9s 0 0 1516.00000 0 33 1574.00000 1516.00000 3.68% - 10s 0 0 1516.00000 0 32 1574.00000 1516.00000 3.68% - 10s 0 0 1517.01923 0 54 1574.00000 1517.01923 3.62% - 11s 0 0 1518.00000 0 71 1574.00000 1518.00000 3.56% - 11s H 0 0 1541.0000000 1518.00000 1.49% - 11s 0 0 1518.08000 0 64 1541.00000 1518.08000 1.49% - 11s 0 2 1519.23158 0 64 1541.00000 1519.23158 1.41% - 13s H 3 3 1540.0000000 1519.23158 1.35% 0.0 14s H 3 3 1532.0000000 1519.23158 0.83% 0.0 14s H 4 3 1530.0000000 1519.23158 0.70% 0.0 14s 9 8 1519.23158 0 32 1530.00000 1519.23158 0.70% 457 15s Explored 10 nodes (62257 simplex iterations) in 15.58 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.530000000000e+03, best bound 1.530000000000e+03, gap 0.0%