[petsc-dev] PETSc - MPI3 functionality

Tamara Dancheva tamaradanceva19933 at gmail.com
Sat Sep 8 03:44:47 CDT 2018

Thank you very much Junchao, super helpful.

On Fri, Sep 7, 2018 at 9:07 PM Junchao Zhang <jczhang at mcs.anl.gov> wrote:

> I have two PETSc pull requests for VecScatter: PR #1037 adds MPI3 process
> shared memory, and PR #1047 adds MPI3 neighborhood collective
> (MPI_Ineighbor_alltoallv).
> In the master branch, there already is another approach applying MPI3
> process shared memory to VecScatter. You can enable it with command line
> option -vecscatter_type mpi3
> --Junchao Zhang
> On Fri, Sep 7, 2018 at 12:26 PM Tamara Dancheva <
> tamaradanceva19933 at gmail.com> wrote:
>> Hi,
>> I am developing an asynchronous method for a FEM solver, and need a
>> custom implementation of the VecScatterBegin and VecScatterEnd routines.
>> Since PETSc uses its own limited set of MPI functions, could you tell what
>> would be the best way possible to extend upon it and use for example the
>> non-blocking collectives, igatherv and so on?
>> I hope the question is specific enough, let me know if anything, I can
>> provide with more information. I would very much appreciate any help,
>> thanks in advance!
>> Best,
>> Tamara
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