[petsc-users] Hang with Internal Error: Ring ids do not match

[Matthew Knepley]

On Mon, Dec 15, 2014 at 7:12 AM, Florian Lindner <mailinglists at xgm.de>
wrote:
>
> Hello,
>
> since our application has two possible entry paths, petsc could be
> initialized at different positions. When used as a library (in contrast to
> a standalone executable), the code looks like:
>
>     PetscErrorCode ierr;
>     std::cout << "Petsc before PetscInitializeNoArguments()"  << std::endl;
>     ierr = PetscInitializeNoArguments(); CHKERRV(ierr);
>     std::cout << "Petsc after PetscInitializeNoArguments()"  << std::endl;
>
> It never get's to "Petsc after..." and instead hangs and prints this error
> message:
>
> Internal Error: invalid error code 609e0e (Ring ids do not match) in
> MPIR_Allreduce_impl:712
> [0]PETSC ERROR: #1 PetscWorldIsSingleHost() line 99 in
> /data2/scratch/lindner/petsc/src/sys/utils/pdisplay.c
> [0]PETSC ERROR: #2 PetscSetDisplay() line 123 in
> /data2/scratch/lindner/petsc/src/sys/utils/pdisplay.c
> [0]PETSC ERROR: #3 PetscOptionsCheckInitial_Private() line 324 in
> /data2/scratch/lindner/petsc/src/sys/objects/init.c
> [0]PETSC ERROR: #4 PetscInitialize() line 881 in
> /data2/scratch/lindner/petsc/src/sys/objects/pinit.c
> [0]PETSC ERROR: #5 SolverInterfaceImpl() line 120 in
> src/precice/impl/SolverInterfaceImpl.cpp
>
> Which is somehow incomprehensible for me... What could be the cause for
> that?
>

It means all procs did not callPetscInitialize(). We call MPI_Allreduce(),
which needs all procs in MPI_COMM_WORLD.

  Thanks,

    Matt


> Thanks,
> Florian
>


-- 
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
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