Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:58:25 2012 Optimize a model with 15974 rows, 5112 columns and 52680 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.55s Presolved: 15972 rows, 5110 columns, 52230 nonzeros Variable types: 0 continuous, 5110 integer (5110 binary) Found heuristic solution: objective 71.0000000 Root relaxation: objective 2.000000e+00, 3506 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 142 71.00000 2.00000 97.2% - 0s H 0 0 66.0000000 2.00000 97.0% - 0s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 445 5.00000 2.66667 46.7% - 5s H 0 0 4.0000000 2.66667 33.3% - 8s 0 0 2.68317 0 4280 4.00000 2.68317 32.9% - 9s 0 0 2.68317 0 4312 4.00000 2.68317 32.9% - 12s 0 0 2.68317 0 4045 4.00000 2.68317 32.9% - 29s 0 0 2.68317 0 4075 4.00000 2.68317 32.9% - 40s 0 0 2.68317 0 4098 4.00000 2.68317 32.9% - 54s 0 0 2.68317 0 3913 4.00000 2.68317 32.9% - 78s 0 0 2.68317 0 3768 4.00000 2.68317 32.9% - 90s 0 0 2.68317 0 3794 4.00000 2.68317 32.9% - 101s 0 0 2.68317 0 3838 4.00000 2.68317 32.9% - 111s 0 0 2.68317 0 3838 4.00000 2.68317 32.9% - 121s 0 1 3.00000 0 3838 4.00000 3.00000 25.0% - 162s Cutting planes: Clique: 204 Zero half: 9 Explored 8 nodes (355215 simplex iterations) in 164.47 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%