  Due to its complex structure the parametrized fixed point action can not be
simulated with the available local updating algorithms. We constructed, coded,
and tested an updating procedure with 2+1 light flavors, where the targeted
s-quark mass is at its physical value while the u- and d-quarks should produce
pions lighter than 300MeV. In the algorithm a partially global gauge update is
followed by several accept/reject steps, where parts of the determinant are
switched on gradually in the order of their expenses. The trial configuration
that is offered in the last, most expensive, stochastic accept/reject step
differs from the original configuration by a Metropolis + over-relaxation gauge
update over a sub-volume of ~(1.3 fm)^4. The acceptance rate in this
accept/reject step is ~0.4. The code is optimized on different architectures
and is running on lattices with L=1.2fm and 1.8fm at a resolution of a=0.15fm.
