[petsc-users] A bad commit affects MOOSE

[Kong, Fande]

Why we do not use user-level MPI communicators directly? What are potential
risks here?


Fande,

On Mon, Apr 2, 2018 at 5:08 PM, Satish Balay <balay at mcs.anl.gov> wrote:

> PETSC_COMM_WORLD [via PetscCommDuplicate()] attempts to minimize calls to
> MPI_Comm_dup() - thus potentially avoiding such errors
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mcs.
> anl.gov_petsc_petsc-2Dcurrent_docs_manualpages_Sys_
> PetscCommDuplicate.html&d=DwIBAg&c=54IZrppPQZKX9mLzcGdPfFD1hxrcB_
> _aEkJFOKJFd00&r=DUUt3SRGI0_JgtNaS3udV68GRkgV4ts7XKfj2opmi
> CY&m=jgv7gpZ3K52d_FWMgkK9yEScbLA7pkrWydFuJnYflsU&s=_
> zpWRcyk3kHuEHoq02NDqYExnXIohXpNnjyabYnnDjU&e=
>
> Satish
>
> On Mon, 2 Apr 2018, Kong, Fande wrote:
>
> > On Mon, Apr 2, 2018 at 4:23 PM, Satish Balay <balay at mcs.anl.gov> wrote:
> >
> > > Does this 'standard test' use MPI_COMM_WORLD' to crate PETSc objects?
> > >
> > > If so - you could try changing to PETSC_COMM_WORLD
> > >
> >
> >
> > I do not think we are using PETSC_COMM_WORLD when creating PETSc objects.
> > Why we can not use MPI_COMM_WORLD?
> >
> >
> > Fande,
> >
> >
> > >
> > > Satish
> > >
> > >
> > > On Mon, 2 Apr 2018, Kong, Fande wrote:
> > >
> > > > Hi All,
> > > >
> > > > I am trying to upgrade PETSc from 3.7.6 to 3.8.3 for MOOSE and its
> > > > applications. I have a error message for a standard test:
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > *preconditioners/pbp.lots_of_variables: MPI had an
> > > > errorpreconditioners/pbp.lots_of_variables:
> > > > ------------------------------------------------
> > > preconditioners/pbp.lots_of_variables:
> > > > Other MPI error, error stack:preconditioners/pbp.lots_of_variables:
> > > > PMPI_Comm_dup(177)..................: MPI_Comm_dup(comm=0x84000001,
> > > > new_comm=0x97d1068) failedpreconditioners/pbp.lots_of_variables:
> > > > PMPI_Comm_dup(162)..................:
> > > > preconditioners/pbp.lots_of_variables:
> > > > MPIR_Comm_dup_impl(57)..............:
> > > > preconditioners/pbp.lots_of_variables:
> > > > MPIR_Comm_copy(739).................:
> > > > preconditioners/pbp.lots_of_variables:
> > > > MPIR_Get_contextid_sparse_group(614): Too many communicators (0/2048
> > > free
> > > > on this process; ignore_id=0)*
> > > >
> > > >
> > > > I did "git bisect', and the following commit introduces this issue:
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > *commit 49a781f5cee36db85e8d5b951eec29f10ac13593Author: Stefano
> Zampini
> > > > <stefano.zampini at gmail.com <stefano.zampini at gmail.com>>Date:   Sat
> Nov 5
> > > > 20:15:19 2016 +0300    PCHYPRE: use internal Mat of type MatHYPRE
> > > > hpmat already stores two HYPRE vectors*
> > > >
> > > > Before I debug line-by-line, anyone has a clue on this?
> > > >
> > > >
> > > > Fande,
> > > >
> > >
> > >
> >
>
>
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