[petsc-dev] [petsc-users] Multigrid with defect correction

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:
>> I know you're skeptical of the DMSNES design, but I think it is highly
>> susceptible to second system syndrome so let's not leap to conclusions
>> about its replacement.
>
>   Jed,
>
>    If you had a clean slate to design something today, including the
>    user facing API, how would it be different, if at all, from the
>    current code?

I'm not sure it would be materially different.  I think I would make a
clear distinction between resolution-dependent and
resolution-independent parts and might express that in a
resolution-independent class for problem specification.  I would support
a hierarchy or labeled basket of approximations rather than relying
solely on Amat and Pmat.
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