2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100292An efficient algorithm for calculating radiative transfer on massively parallel computers using domain decomposition is presented. The integral formulation of the transfer equation is used to divide the problem into a local but compute-intensive part for calculating the intensity and optical depth integrals, and a nonlocal part for communicating the intensity between adjacent processors. The waiting time of idle processors during the nonlocal communication part does not have a severe impact on the scaling. The wall clock time thus scales nearly linearly with the inverse number of processors.7 pages, 5 figures, 1 table; substantial improvements; recommended for publication in A&AAstrophysicstext