Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:48:09 2012

Optimize a model with 6117 rows, 2162 columns and 20284 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.10s
Presolved: 6115 rows, 2160 columns, 20157 nonzeros
Variable types: 0 continuous, 2160 integer (2160 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 2.666667e+00, 3811 iterations, 0.42 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0    2.66667    0  126   46.00000    2.66667  94.2%     -    2s
H    0     0                      33.0000000    2.66667  91.9%     -    2s
H    0     0                       5.0000000    2.66667  46.7%     -    2s
     0     0    3.00000    0 1127    5.00000    3.00000  40.0%     -    3s
H    0     0                       4.0000000    3.00000  25.0%     -    3s
     0     0    3.00000    0  790    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0 1485    4.00000    3.00000  25.0%     -    4s
     0     0    3.00000    0  127    4.00000    3.00000  25.0%     -    7s
     0     2    3.00000    0   72    4.00000    3.00000  25.0%     -    9s
     2     3    3.00000    1  127    4.00000    3.00000  25.0%  4283   11s
     4     4    3.00000    1  116    4.00000    3.00000  25.0%  2142   15s

Cutting planes:
  Gomory: 17
  Clique: 1
  Zero half: 88

Explored 5 nodes (74025 simplex iterations) in 18.16 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%