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ENH: add guards for partially populated communicators

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- these are primarily when encountering sparse (eg, inter-host)
  communicators. Additional UPstream convenience methods:

  is_rank(comm)
    => True if process corresponds to a rank in the communicators.
       Can be a master rank or a sub-rank.

  is_parallel(comm)
    => True if parallel algorithm or exchange is used on the process.
       same as

           (parRun() && (nProcs(comm) > 1) && is_rank(comm))
This commit is contained in:
Mark Olesen
2023-04-14 15:00:03 +02:00
parent 74db18a9c3
commit b277b913cf
15 changed files with 257 additions and 152 deletions
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8
applications/test/parallel-comm2/Test-parallel-comm2.C
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@ -52,8 +52,8 @@ void rankInfo(const label comm)
<< "(parent:" << UPstream::parent(comm) << ')'
<< " rank:" << ranki
<< "(sub:" << UPstream::is_subrank(comm)
<< ") nProcs:" << UPstream::nProcs(comm)
<< " baseProcNo:" << UPstream::baseProcNo(comm, ranki);
<< ") nProcs:" << UPstream::nProcs(comm);
// << " baseProcNo:" << UPstream::baseProcNo(comm, ranki);
}
@ -82,8 +82,10 @@ int main(int argc, char *argv[])
#include "setRootCase.H"
Info<< nl
<< "parallel:" << UPstream::parRun()
<< "nProcs = " << UPstream::nProcs()
<< " with " << UPstream::nComms() << " predefined comm(s)" << nl;
<< " with " << UPstream::nComms() << " predefined comm(s)."
<< " proc:" << UPstream::myProcNo() << nl;
Info<< nl;