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 <ba...@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 <ba...@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.zamp...@gmail.com <stefano.zamp...@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, > > > > > > > > > > > > > >
