[petsc-users] Question about parallel Vectors and communicators

[GIRET Jean-Christophe]

Dear PETSc users,

I would like to use Petsc4Py for a project extension, which consists mainly of:

-          Storing data and matrices on several rank/nodes which could not fit on a single node.

-          Performing some linear algebra in a parallel fashion (solving sparse linear system for instance)

-          Exchanging those data structures (parallel vectors) between non-overlapping MPI communicators, created for instance by splitting MPI_COMM_WORLD.

While the two first items seems to be well addressed by PETSc, I am wondering about the last one.

Is it possible to access the data of a vector, defined on a communicator from another, non-overlapping communicator? From what I have seen from the documentation and the several threads on the user mailing-list, I would say no. But maybe I am missing something? If not, is it possible to transfer a vector defined on a given communicator on a communicator which is a subset of the previous one?

Best regards,
Jean-Christophe


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20190507/39656289/attachment-0001.html>