[petsc-users] A bad commit affects MOOSE

[Smith, Barry F.]

> On Apr 3, 2018, at 11:59 AM, Balay, Satish <balay at mcs.anl.gov> wrote:
> 
> On Tue, 3 Apr 2018, Smith, Barry F. wrote:
> 
>>   Note that PETSc does one MPI_Comm_dup() for each hypre matrix. Internally hypre does at least one MPI_Comm_create() per hypre boomerAMG solver. So even if PETSc does not do the MPI_Comm_dup() you will still be limited due to hypre's MPI_Comm_create.
>> 
>>    I will compose an email to hypre cc:ing everyone to get information from them.
> 
> Actually I don't see any calls to MPI_Comm_dup() in hypre sources [there are stubs for it for non-mpi build]
> 
> There was that call to MPI_Comm_create() in the stack trace [via hypre_BoomerAMGSetup]

   This is what I said. The MPI_Comm_create() is called for each solver and hence uses a slot for each solver.

   Barry

> 
> Satish