[petsc-users] MPI_Comm_spawn when using PETSc

[Barry Smith]

   I have added a new issue at https://bitbucket.org/petsc/petsc/issue/43/add-petscreinitialize to list this as a future enhancement to PETSc.

    Barry

On May 27, 2013, at 9:26 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Mon, May 27, 2013 at 10:03 AM, Suraj Prabhakaran <s.prabhakaran at grs-sim.de> wrote:
> Dear all,
> 
> I am completely new to PETSc. I would like to know if it is possible to use PETSc after increasing the number of processes in an MPI program through MPI_Comm_spawn.
> The application is started with a set of MPI processes and the PETSC is initialized with this set. At a later point, the application could indeed increase the set of processes (through MPI_Comm_spawn) and create a intra communicator with the parent and the children. I would like to use these processes too with PETSC. Would this be possible (by providing the new communicator for instance)?
> 
> You can give a PetscObject any communicator, however PETSC_COMM_WORLD is used for a bunch of global stuff,
> like logging, so you may get unexpected behavior.
> 
>    Matt
>  
> Thanks!
> Regards,
> Suraj
> 
> 
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener