Parallel tempering simulates at many quark masses simultaneously, by changing
the mass during the simulation while remaining in equilibrium. The algorithm is
faster than pure HMC if more than one mass is needed, and works better the
smaller the smallest mass is.Comment: 4 pages, 2 figures, Combined proceedings for Lattice 97, Edinburgh
and the International Workshop 'Lattice QCD on Parallel Computers',
University of Tsukuba, Japa
