Gurobi 5.0.1 (linux64) logging started Fri Nov 16 14:31:24 2012

Optimize a model with 22124 rows, 5700 columns and 71698 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.75s
Presolved: 22197 rows, 5698 columns, 76733 nonzeros
Variable types: 0 continuous, 5698 integer (5698 binary)
Found heuristic solution: objective 75.0000000

Root relaxation: objective 2.000000e+00, 4236 iterations, 0.18 seconds

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

     0     0    2.00000    0  150   75.00000    2.00000  97.3%     -    1s
H    0     0                      74.0000000    2.00000  97.3%     -    1s
H    0     0                       6.0000000    2.00000  66.7%     -    1s
     0     0    2.66667    0 3545    6.00000    2.66667  55.6%     -   14s
     0     0    2.66667    0 3545    6.00000    2.66667  55.6%     -   15s
     0     0    2.66667    0  212    6.00000    2.66667  55.6%     -   18s
H    0     0                       5.0000000    2.66667  46.7%     -   24s
     0     2    2.66667    0  210    5.00000    2.66667  46.7%     -   30s
     4     6    4.00000    4  275    5.00000    2.66667  46.7%  4219   35s
    55    24    3.16667    2  237    5.00000    3.16667  36.7%   875   40s
   490    62     cutoff   25         5.00000    4.00000  20.0%   230   45s
*  493     0              21       4.0000000    4.00000   0.0%   229   45s

Cutting planes:
  Clique: 130
  Zero half: 3

Explored 494 nodes (159341 simplex iterations) in 45.01 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%