[petsc-dev] Trying to get DMShell usable for PFLOTRAN

Jed Brown jedbrown at mcs.anl.gov
Sun Mar 3 14:20:06 CST 2013

On Sun, Mar 3, 2013 at 2:14 PM, Richard Tran Mills <rtm at eecs.utk.edu> wrote:

> It works fine with the patch.  Thanks for your help!
> Regarding my question about having the DMShell object default to using
> DMShellGlobalToLocalBegin()/End() if a scatter context has been specified
> with DMShellSetGlobalToLocalVecScatter(), does that sound appropriate?  I
> think the thing to do is to set dm->ops->globaltolocalbegin to point to
> DMShellDefaultGlobalToLocalBegin when the DMShell is created, and make
> DMShellDefaultGlobalToLocalBegin check to see if a global to local
> VecScatter has been set and then complain (with a helpful error message) if
> not.

That sounds fine to me. At some point, we should deal with the chaos of
having DM options use a global SF when available. Aesthetically, I'd rather
that "use SF for communication" be decoupled from "here is an SF", possibly
to the extent that the SF be in DM_XX instead of _p_DM, but not strongly
enough to change it now.
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