  We report on our study of the Riemannian Manifold HMC (RMHMC) algorithm with
the mass term for the gauge momenta replaced by rational functions of the gauge
covariant Laplace operator. A comparison of HMC and RMHMC on a 2+1+1 flavor
dynamical ensemble with lattice spacing a ~0.05fm shows increased rate of
change in long distance modes, identified by Wilson flowed energy, per fermion
molecular dynamics step.
