Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:50:12 2013 Optimize a model with 41728 rows, 41088 columns and 163968 nonzeros Presolve removed 64 rows and 0 columns Presolve time: 0.18s Presolved: 41664 rows, 41088 columns, 163904 nonzeros Variable types: 41024 continuous, 64 integer (64 binary) Root relaxation: objective 5.315367e+04, 4894 iterations, 2.17 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 53153.6671 0 47 - 53153.6671 - - 2s H 0 0 81203.000000 53153.6671 34.5% - 3s 0 0 64632.3932 0 9 81203.0000 64632.3932 20.4% - 7s H 0 0 73080.121813 64632.3932 11.6% - 7s H 0 0 70735.000000 64632.3932 8.63% - 7s 0 0 66109.9079 0 9 70735.0000 66109.9079 6.54% - 8s H 0 0 70345.000000 66109.9079 6.02% - 8s 0 0 67388.3315 0 4 70345.0000 67388.3315 4.20% - 10s 0 0 67637.6446 0 2 70345.0000 67637.6446 3.85% - 10s H 0 0 70246.487603 67637.6446 3.71% - 10s H 0 0 69911.000000 67637.6446 3.25% - 10s H 0 0 68043.000000 67637.6446 0.60% - 10s 0 2 67638.0597 0 2 68043.0000 67638.0597 0.60% - 11s H 11 5 68041.000000 67784.7349 0.38% 138 12s H 13 6 68024.411765 67784.7349 0.35% 122 12s * 37 6 5 67992.000000 67797.3740 0.29% 104 13s 73 8 67991.3051 8 1 67992.0000 67950.4297 0.06% 81.2 15s * 75 0 12 67954.000000 67954.0000 0.0% 79.5 15s Cutting planes: Implied bound: 61 Explored 76 nodes (18120 simplex iterations) in 15.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.795400000000e+04, best bound 6.795400000000e+04, gap 0.0%