Gurobi 5.0.1 (linux64) logging started Mon Feb 4 20:26:42 2013 Optimize a model with 682800 rows, 25600 columns and 2060800 nonzeros Presolve removed 28527 rows and 12927 columns (presolve time = 6s) ... Presolve removed 33804 rows and 12959 columns (presolve time = 11s) ... Presolve removed 33804 rows and 12959 columns Presolve time: 11.31s Presolved: 648996 rows, 12641 columns, 1955776 nonzeros Variable types: 56 continuous, 12585 integer (12585 binary) Found heuristic solution: objective 600968.00000 Root simplex log... Iteration Objective Primal Inf. Dual Inf. Time 9656 4.2074320e+05 0.000000e+00 8.385810e+08 6s 20519 4.2695623e+05 0.000000e+00 1.522487e+08 10s 35003 4.3263720e+05 0.000000e+00 1.416146e+08 15s 50694 4.4238876e+05 0.000000e+00 1.859549e+08 20s 71213 4.5204803e+05 0.000000e+00 1.562990e+07 25s 86904 4.6598565e+05 0.000000e+00 4.125464e+06 30s 93955 4.7213536e+05 0.000000e+00 0.000000e+00 35s 93955 4.7213536e+05 0.000000e+00 0.000000e+00 35s Root relaxation: objective 4.721354e+05, 93955 iterations, 35.34 seconds Total elapsed time = 50.36s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 472135.364 0 10 600968.000 472135.364 21.4% - 51s H 0 0 472144.00000 472135.364 0.00% - 52s Explored 0 nodes (94449 simplex iterations) in 52.16 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.721440000000e+05, best bound 4.721360000000e+05, gap 0.0017%