[petsc-dev] Question about PCGASMSetSubdomains()

[Barry Smith]

  Fande,

     How does PCGASMSetSubdomains() know which subdomain from an index set on one process is connected to an index set on another processor? Are you assuming the index sets on each process are somehow ordered to make sure that the right parts on each process connect to form the entire domain? What if someone passed them in a different order on some process, is there anyway to error check that?

   Thanks

     Barry