Gurobi 5.0.1 (linux64) logging started Sun Nov 18 00:14:41 2012

Optimize a model with 137 rows, 322 columns and 322 nonzeros
Model has 272 quadratic constraints
Presolve time: 1.58s
Presolved: 137 rows, 322 columns, 322 nonzeros
Variable types: 272 continuous, 50 integer (50 binary)

Root relaxation: objective 0.000000e+00, 25 iterations, 0.00 seconds

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

H    0     0                      57.0000000          -     -      -    1s
     0     0    0.00000    0    2   57.00000    0.00000   100%     -    1s
     0     0    0.00000    0   37   57.00000    0.00000   100%     -    1s
     0     0    0.00000    0   21   57.00000    0.00000   100%     -    1s
     0     2    0.00000    0   21   57.00000    0.00000   100%     -    1s
*   39    37              25      39.0000000    4.74359  87.8%  29.8    1s
*   42    33              24      38.0000000    4.74359  87.5%  27.9    1s
H  139    93                      33.0000000    5.08537  84.6%  28.0    1s
*  527   218              17      32.0000000   12.71429  60.3%  28.8    1s
*  752   261              34      31.0000000   15.81818  49.0%  33.4    2s
  2951   281   25.50000   29  190   31.00000   24.32432  21.5%  24.2    5s

Explored 3846 nodes (86830 simplex iterations) in 6.56 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%