[petsc-users] Copying PETSc Objects Across MPI Communicators

[Damyn Chipman]

Hi PETSc developers,

In short, my question is this: Does PETSc provide a way to move or copy an object (say a Mat) from one communicator to another?

The more detailed scenario is this: I’m working on a linear algebra solver on quadtree meshes (i.e., p4est). I use communicator subsets in order to facilitate communication between siblings or nearby neighbors. When performing linear algebra across siblings (a group of 4), I need to copy a node’s data (i.e., a Mat object) from a sibling’s communicator to the communicator that includes the four siblings. From what I can tell, I can only copy a PETSc object onto the same communicator.

My current approach will be to copy the raw data from the Mat on one communicator to a new Mat on the new communicator, but I wanted to see if there is a more “elegant” approach within PETSc.

Thanks in advance,

Damyn Chipman
Boise State University
PhD Candidate
Computational Sciences and Engineering
damynchipman at u.boisestate.edu

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