  A parallel version of the invaded cluster algorithm is described. Results
from large scale (up to 4096^2 and 512^3) simulations of the Ising model are
reported. No evidence of critical slowing down is found for the
three-dimensional Ising model. The magnetic exponent is estimated to be 2.482
\pm .001 (beta/nu = 0.518 pm .001) for the three-dimensional Ising model.
