Ok, I think I understand the strategy. It does sound easy enough, let me
just clean up a couple of things off my plate first and then I can give
this a swing.
Thanks again for the info,
- Boris
On 4/1/19 9:19 PM, Matthew Knepley wrote:
On Mon, Apr 1, 2019 at 9:12 PM Boris Boutkov via petsc-dev
<[email protected] <mailto:[email protected]>> wrote:
Hello all,
I've been working on the libMesh - PETSc interface for utilizing
gmg/fieldsplit on the command line by creating DMShells; things
are seemingly in pretty good shape at this point, so thanks much
for the support along the way!
The last lingering issue of the implementation is that I still
have a little bit of dependency on PETSc private/dmimpl.h. In
short, during our implementation of DMCreateSubDM I try and get
some of the parent DMs function pointers, specifically
dm->ops->{coarsen, refine, createinterpolation,
createrestriction,and createsubdm}, which then I set for the subDM
using DMShellSet* by passing in the parent DM pointer directly.
I'd like to remove this private dmimpl.h dependency but removing
the header gives me compilation errors - "invalid use of
incomplete type" pointing to PETsc DM struct for the above calls.
As far as I understand it, this means that I would need public API
similar to the DMShellSet* methods but now instead DMShellGet*.
If the above's the case, any reason this doesn't exist yet outside
of lack of prior need? And how much work would introducing this
require? Or of course please let me know if there's some simple
way around this that I may be missing.
No, we just needed someone to ask. We will do this exactly like we do
MATSHELL. We have to create an Enum that indexes
the DM methods. Then you can pass the Enum value when you Set/Get the
methods. Its not hard, just some coding. Want to try :)
Thanks,
Matt
Thanks as always for your time,
- Boris
--
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
https://www.cse.buffalo.edu/~knepley/
<http://www.cse.buffalo.edu/~knepley/>
