current bounds on the number of colors: 0 -- 35 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:41 2012 Optimize a model with 5220 rows, 900 columns and 16150 nonzeros Presolve time: 0.02s Presolved: 5220 rows, 900 columns, 16150 nonzeros Variable types: 0 continuous, 900 integer (900 binary) Root relaxation: objective 0.000000e+00, 74 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (192 simplex iterations) in 0.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 17 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:41 2012 Optimize a model with 2475 rows, 585 columns and 7600 nonzeros Presolve time: 0.01s Presolved: 2475 rows, 585 columns, 7600 nonzeros Variable types: 0 continuous, 585 integer (585 binary) Root relaxation: objective 0.000000e+00, 70 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 18 - 0.00000 - - 0s * 0 0 0 0.0000000 0.00000 0.0% - 0s Cutting planes: Gomory: 1 Clique: 17 MIR: 7 Zero half: 5 Explored 0 nodes (839 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:41 2012 Optimize a model with 1255 rows, 445 columns and 3800 nonzeros Presolve time: 0.00s Presolved: 1255 rows, 445 columns, 3800 nonzeros Variable types: 0 continuous, 445 integer (445 binary) Root relaxation: objective 0.000000e+00, 70 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 70 - 0.00000 - - 0s 0 0 0.00000 0 62 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1051 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 4 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:41 2012 Optimize a model with 1865 rows, 515 columns and 5700 nonzeros Presolve time: 0.00s Presolved: 1865 rows, 515 columns, 5700 nonzeros Variable types: 0 continuous, 515 integer (515 binary) Root relaxation: objective 0.000000e+00, 71 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 38 - 0.00000 - - 0s 0 0 0.00000 0 47 - 0.00000 - - 0s 0 0 0.00000 0 166 - 0.00000 - - 0s 0 0 0.00000 0 177 - 0.00000 - - 0s 0 0 0.00000 0 179 - 0.00000 - - 0s 0 0 0.00000 0 166 - 0.00000 - - 0s 0 0 0.00000 0 179 - 0.00000 - - 0s 0 0 0.00000 0 156 - 0.00000 - - 0s 0 2 0.00000 0 156 - 0.00000 - - 1s Cutting planes: Clique: 18 Zero half: 2 Explored 5 nodes (9945 simplex iterations) in 1.02 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - current bounds on the number of colors: 6 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:57:42 2012 Optimize a model with 2170 rows, 550 columns and 6650 nonzeros Presolve time: 0.01s Presolved: 2170 rows, 550 columns, 6650 nonzeros Variable types: 0 continuous, 550 integer (550 binary) Root relaxation: objective 0.000000e+00, 70 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 32 - 0.00000 - - 0s 0 0 0.00000 0 38 - 0.00000 - - 0s 0 0 0.00000 0 39 - 0.00000 - - 0s 0 0 0.00000 0 79 - 0.00000 - - 0s 0 0 0.00000 0 81 - 0.00000 - - 0s 0 0 0.00000 0 67 - 0.00000 - - 0s 0 0 0.00000 0 108 - 0.00000 - - 0s 0 0 0.00000 0 108 - 0.00000 - - 0s 0 2 0.00000 0 108 - 0.00000 - - 0s Cutting planes: Clique: 28 Zero half: 4 Explored 45 nodes (10761 simplex iterations) in 1.07 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 8