> On 24 Aug 2019, at 3:07 PM, Smith, Barry F. <bsm...@mcs.anl.gov> wrote:
>
>
>
> It is an oversight. It saves a global reduction in the MatAssembly since
> all the processes know they don't need to communicate anything.
OK, that’s what I was hoping for.
I tried to force the flag and it doesn’t seem to break down my PC, so I’ll push
this in a branch (and create the according MR when we receive your green light).
Thanks,
Pierre
> Barry
>
>> On Aug 24, 2019, at 7:55 AM, Pierre Jolivet via petsc-dev
>> <petsc-dev@mcs.anl.gov> wrote:
>>
>> Hello,
>> Out of the three SetPreallocationCSR implementations (for MPIAIJ, MPIBAIJ,
>> and MPISBAIJ), only MPIAIJ is forcing MAT_NO_OFF_PROC_ENTRIES to PETSC_TRUE
>> before the final AssemblyBegin/AssemblyEnd:
>> - AIJ
>> https://www.mcs.anl.gov/petsc/petsc-current/src/mat/impls/aij/mpi/mpiaij.c.html#line3957
>> - BAIJ
>> https://www.mcs.anl.gov/petsc/petsc-current/src/mat/impls/baij/mpi/mpibaij.c.html#line2782
>> and SBAIJ
>> https://www.mcs.anl.gov/petsc/petsc-current/src/mat/impls/sbaij/mpi/mpisbaij.c.html#line2262
>>
>> Is this option not relevant for those two types or is this an oversight?
>>
>> Thanks,
>> Pierre
>
