Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:37 2012 Optimize a model with 628 rows, 111 columns and 1256 nonzeros Presolve removed 224 rows and 0 columns Presolve time: 0.00s Presolved: 404 rows, 111 columns, 1014 nonzeros Variable types: 0 continuous, 111 integer (111 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.874667e+01, 269 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.74667 0 106 26.00000 38.74667 49.0% - 0s H 0 0 28.0000000 38.74667 38.4% - 0s 0 0 38.41458 0 108 28.00000 38.41458 37.2% - 0s H 0 0 29.0000000 38.41458 32.5% - 0s 0 0 38.26364 0 109 29.00000 38.26364 31.9% - 0s 0 0 38.12637 0 110 29.00000 38.12637 31.5% - 0s 0 0 37.90979 0 107 29.00000 37.90979 30.7% - 0s 0 0 37.83337 0 110 29.00000 37.83337 30.5% - 0s 0 0 37.73161 0 110 29.00000 37.73161 30.1% - 0s 0 0 37.66767 0 110 29.00000 37.66767 29.9% - 0s 0 0 37.60334 0 111 29.00000 37.60334 29.7% - 0s H 0 0 30.0000000 37.60334 25.3% - 0s 0 0 37.58326 0 111 30.00000 37.58326 25.3% - 0s 0 0 37.56857 0 111 30.00000 37.56857 25.2% - 0s 0 0 37.52605 0 110 30.00000 37.52605 25.1% - 0s 0 0 37.48792 0 110 30.00000 37.48792 25.0% - 0s 0 0 37.47865 0 111 30.00000 37.47865 24.9% - 0s 0 0 37.47865 0 111 30.00000 37.47865 24.9% - 0s 0 2 37.47806 0 111 30.00000 37.47806 24.9% - 0s * 14 14 11 31.0000000 37.47806 20.9% 39.8 0s Explored 2720 nodes (56823 simplex iterations) in 2.22 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%