Gurobi 5.0.1 (linux64) logging started Tue Nov 20 07:39:03 2012 Optimize a model with 1231 rows, 155 columns and 2462 nonzeros Presolve removed 534 rows and 0 columns Presolve time: 0.01s Presolved: 697 rows, 155 columns, 1918 nonzeros Variable types: 0 continuous, 155 integer (155 binary) Found heuristic solution: objective 33.0000000 Root relaxation: objective 4.890130e+01, 437 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 48.90130 0 154 33.00000 48.90130 48.2% - 0s 0 0 48.58170 0 154 33.00000 48.58170 47.2% - 0s H 0 0 34.0000000 48.58170 42.9% - 0s H 0 0 36.0000000 48.58170 34.9% - 0s 0 0 48.48694 0 154 36.00000 48.48694 34.7% - 0s 0 0 48.40899 0 155 36.00000 48.40899 34.5% - 0s 0 0 48.29821 0 155 36.00000 48.29821 34.2% - 0s 0 0 48.20581 0 155 36.00000 48.20581 33.9% - 0s 0 0 48.16257 0 155 36.00000 48.16257 33.8% - 0s 0 0 48.15723 0 155 36.00000 48.15723 33.8% - 0s 0 0 48.15723 0 154 36.00000 48.15723 33.8% - 0s 0 2 48.15635 0 154 36.00000 48.15635 33.8% - 0s 1621 635 40.79048 25 115 36.00000 44.13629 22.6% 55.6 5s 3889 1704 39.94626 21 106 36.00000 42.39143 17.8% 47.0 10s 7167 2918 39.71084 32 103 36.00000 41.37037 14.9% 42.4 15s 11022 3979 38.30899 36 103 36.00000 40.66225 13.0% 39.3 20s 15565 4863 38.94059 36 102 36.00000 40.16782 11.6% 37.2 25s 20245 5348 37.08468 33 85 36.00000 39.75817 10.4% 35.5 30s 25387 5574 38.20000 25 101 36.00000 39.38684 9.41% 34.3 35s 30647 5412 37.45455 35 84 36.00000 39.03448 8.43% 33.3 40s 36145 4821 cutoff 38 36.00000 38.70066 7.50% 32.5 45s 41817 3640 37.57609 37 84 36.00000 38.33333 6.48% 31.8 50s 46222 2103 37.77778 32 71 36.00000 38.00000 5.56% 31.2 55s Explored 50096 nodes (1512417 simplex iterations) in 57.39 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.600000000000e+01, best bound 3.600000000000e+01, gap 0.0%