A small question about subdomain renumbering

[yuesu jin]

Dear all,

  I have a question about DoFRenumbering::subdomain_wise(dof_handler). In step-17 tutorial for example, this function doesn't use the argument of n_mpi_processes, how does it know how many subdomains it should divide the dofs into? 

After we renumbered the subdomain and get the locally_owned_dofs_per_subomain, we can already use this_mpi_process to access the partition vector, which means the subdomain partition has been done according to the n_mpi_processes.  

Best regards,
--

Yuesu Jin,

Ph.D student,

University of Houston,

College of Natural Sciences and Mathematics,

Department of Earth and Atmospheric Sciences,
Houston, Texas 77204-5008


346-404-2062

[Bruno Turcksin]

Yuesu,

On Thursday, August 6, 2020 at 12:08:58 AM UTC-4, yuesu jin wrote:

Dear all,

  I have a question about DoFRenumbering::subdomain_wise(dof_handler). In step-17 tutorial for example, this function doesn't use the argument of n_mpi_processes, how does it know how many subdomains it should divide the dofs into?

The DoFHandler has access to the Triangulation which knows this information because we call GridTools::partition_triangulation() before we call DoFRenumbering::subdomain_wise().

Best,

Bruno