Dear all, I was playing with DMPlex objects and I was trying to exactly figure out what the `overlap` parameter in DMPlexDistribute does.
From the tutorial "Flexible, Scalable Mesh and Data Management using PETSc DMPlex" (slide 10) and from the work by Knepley et al. "Unstructured Overlapping Mesh Distribution in Parallel" I somehow got the idea that it should control the "depth" of the mesh overlap. That is, given the partition boundary, if overlay is set to 0 only the entities adjacent (in the DMPlex topological sense and with the "style" defined by the AdjacencyUse routines) to entities at the boundary are shared, if overlay is 1 the first and the second neighbors (always in the DMPlex topological sense) are shared and so on, up to the point were we have a full duplicate of the mesh on each process (i.e. there is no upper bound on `overlap`). Is this correct or am I -totally- misunderstanding the meaning of the parameter? I am asking this because I see some behavior I cannot explain at varying the value of the overlap, but before going into the details I would like to be sure to understand exactly what the overlap parameter is supposed to do. Many thanks, -- Francesco Caimmi Laboratorio di Ingegneria dei Polimeri http://www.chem.polimi.it/polyenglab/ Politecnico di Milano - Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta” P.zza Leonardo da Vinci, 32 I-20133 Milano Tel. +39.02.2399.4711 Fax +39.02.7063.8173 [email protected] Skype: fmglcaimmi (please arrange meetings by e-mail)
