Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:49 2012 Optimize a model with 629 rows, 111 columns and 1258 nonzeros Presolve removed 238 rows and 0 columns Presolve time: 0.00s Presolved: 391 rows, 111 columns, 1000 nonzeros Variable types: 0 continuous, 111 integer (111 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.889474e+01, 265 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.89474 0 106 28.00000 38.89474 38.9% - 0s H 0 0 31.0000000 38.89474 25.5% - 0s 0 0 38.00000 0 108 31.00000 38.00000 22.6% - 0s 0 0 38.00000 0 108 31.00000 38.00000 22.6% - 0s 0 0 37.75424 0 109 31.00000 37.75424 21.8% - 0s 0 0 37.56192 0 109 31.00000 37.56192 21.2% - 0s 0 0 37.38112 0 110 31.00000 37.38112 20.6% - 0s 0 0 37.24798 0 111 31.00000 37.24798 20.2% - 0s 0 0 37.22184 0 109 31.00000 37.22184 20.1% - 0s 0 0 37.16063 0 110 31.00000 37.16063 19.9% - 0s 0 0 37.11637 0 111 31.00000 37.11637 19.7% - 0s 0 0 37.04710 0 109 31.00000 37.04710 19.5% - 0s 0 0 37.00390 0 110 31.00000 37.00390 19.4% - 0s 0 0 36.97697 0 111 31.00000 36.97697 19.3% - 0s 0 0 36.96127 0 111 31.00000 36.96127 19.2% - 0s 0 0 36.95066 0 111 31.00000 36.95066 19.2% - 0s 0 0 36.95066 0 111 31.00000 36.95066 19.2% - 0s 0 2 36.94761 0 111 31.00000 36.94761 19.2% - 0s * 321 67 7 32.0000000 35.04056 9.50% 27.6 0s Cutting planes: Clique: 7 Zero half: 60 Explored 602 nodes (15911 simplex iterations) in 0.63 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%