Assuming you have generated your renumbering, you can use https://petsc.org/release/manualpages/AO/AO/#ao to convert lists in the old (or new) numbering to the new (or old) numbering.
Barry > On May 2, 2023, at 8:34 AM, Matthew Knepley <knep...@gmail.com> wrote: > > On Tue, May 2, 2023 at 8:25 AM Karthikeyan Chockalingam - STFC UKRI via > petsc-users <petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>> wrote: >> Hello, >> >> >> >> This is not exactly a PETSc question. I have a parallel partitioned finite >> element mesh. What are the steps involved in having a contiguous but unique >> set of node numbering from one partition to the next? There are nodes which >> are shared between different partitions. Moreover, this partition has to >> coincide parallel partition of PETSc Vec/Mat, which ensures data locality. >> >> >> >> If you can post the algorithm or cite a reference, it will prove helpful. >> > > Somehow, you have to know what "nodes" are shared. Once you know this, you > can make a rule for numbering, such > as "the lowest rank gets the shared nodes". We encapsulate this ownership > relation in the PetscSF. Roots are owned, > and leaves are not owned. The rule above is not great for load balance, so we > have an optimization routine for the > simple PetscSF: > https://petsc.org/main/manualpages/DMPlex/DMPlexRebalanceSharedPoints/ > > Thanks, > > Matt > >> Many thanks. >> >> >> >> Kind regards, >> >> Karthik. >> >> >> > > > -- > What most experimenters take for granted before they begin their experiments > is infinitely more interesting than any results to which their experiments > lead. > -- Norbert Wiener > > https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
