Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:53:31 2012 Optimize a model with 767 rows, 118 columns and 1534 nonzeros Presolve removed 311 rows and 0 columns Presolve time: 0.01s Presolved: 456 rows, 118 columns, 1208 nonzeros Variable types: 0 continuous, 118 integer (118 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.907341e+01, 286 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 39.07341 0 117 25.00000 39.07341 56.3% - 0s H 0 0 28.0000000 39.07341 39.5% - 0s 0 0 38.75270 0 116 28.00000 38.75270 38.4% - 0s H 0 0 29.0000000 38.75270 33.6% - 0s 0 0 38.55666 0 116 29.00000 38.55666 33.0% - 0s H 0 0 30.0000000 38.55666 28.5% - 0s 0 0 38.47379 0 117 30.00000 38.47379 28.2% - 0s 0 0 38.37462 0 117 30.00000 38.37462 27.9% - 0s 0 0 38.26469 0 117 30.00000 38.26469 27.5% - 0s 0 0 38.16536 0 117 30.00000 38.16536 27.2% - 0s 0 0 38.12694 0 116 30.00000 38.12694 27.1% - 0s H 0 0 31.0000000 38.12694 23.0% - 0s 0 0 38.04095 0 117 31.00000 38.04095 22.7% - 0s 0 0 37.99980 0 118 31.00000 37.99980 22.6% - 0s 0 0 37.98502 0 118 31.00000 37.98502 22.5% - 0s 0 0 37.97476 0 118 31.00000 37.97476 22.5% - 0s 0 0 37.97476 0 118 31.00000 37.97476 22.5% - 0s 0 2 37.97139 0 118 31.00000 37.97139 22.5% - 0s Explored 2540 nodes (67053 simplex iterations) in 3.08 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%