Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:46:35 2013 Optimize a model with 40446 rows, 39816 columns and 158886 nonzeros Presolve removed 63 rows and 0 columns Presolve time: 0.17s Presolved: 40383 rows, 39816 columns, 158823 nonzeros Variable types: 39753 continuous, 63 integer (63 binary) Root relaxation: objective 5.478716e+04, 6271 iterations, 3.59 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54787.1607 0 51 - 54787.1607 - - 3s H 0 0 79374.000000 54787.1607 31.0% - 5s 0 0 66702.3485 0 9 79374.0000 66702.3485 16.0% - 9s H 0 0 73411.773456 66702.3485 9.14% - 9s H 0 0 71803.000000 66702.3485 7.10% - 9s H 0 0 71282.000000 66702.3485 6.42% - 9s 0 0 67335.5693 0 4 71282.0000 67335.5693 5.54% - 9s H 0 0 71154.000000 67335.5693 5.37% - 9s 0 0 67401.0330 0 4 71154.0000 67401.0330 5.27% - 10s H 0 0 70355.561655 67401.0330 4.20% - 10s H 0 0 68678.000000 67401.0330 1.86% - 10s H 0 0 68244.000000 67401.0330 1.24% - 10s 0 2 67404.7451 0 4 68244.0000 67404.7451 1.23% - 11s H 9 8 68102.666667 67493.3975 0.89% 194 12s H 13 4 67734.000000 67493.3975 0.36% 177 12s * 19 4 15 67703.000000 67493.3975 0.31% 170 13s Cutting planes: Implied bound: 55 Explored 26 nodes (15281 simplex iterations) in 13.47 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.770300000000e+04, best bound 6.770300000000e+04, gap 0.0%