PETSc version 3.17.5
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DMPatchZoom

Create patches of a DMDA on subsets of processes, indicated by commz

Synopsis

#include "petscdmpatch.h"   
PetscErrorCode DMPatchZoom(DM dm, MatStencil lower, MatStencil upper, MPI_Comm commz, DM *dmz, PetscSF *sfz, PetscSF *sfzr)
Collective on dm

Input Parameters

dm - the DM
lower - the lower left corner of the requested patch
upper - the upper right corner of the requested patch
commz - the new communicator for the patch, MPI_COMM_NULL indicates that the given rank will not own a patch

Output Parameters

dmz - the patch DM
sfz - the PetscSF mapping the patch+halo to the zoomed version (optional)
sfzr - the PetscSF mapping the patch to the restricted zoomed version

See Also

DMPatchSolve(), DMDACreatePatchIS()

Level

intermediate

Location

src/dm/impls/patch/patch.c
Index of all DMPATCH routines
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