[petsc-dev] ASM for each field solve on GPUs

Mark Adams mfadams at lbl.gov
Wed Dec 30 22:16:53 CST 2020

I think the first thing that I need to do is get ASM working on the CPU in
my code as a direct solver.

FieldSplit was mentioned the way to do this. How would I do that?


On Wed, Dec 30, 2020 at 11:11 PM Jed Brown <jed at jedbrown.org> wrote:

> Barry Smith <bsmith at petsc.dev> writes:
> >   I was assuming the triangular systems were all solvable and setup in
> the correct format so the triangular solver would not be the place to first
> detect problems with the factor. Though not completely generally that seems
> to cover most cases.
> You could write a solver that way, but that doesn't appear to be what
> cusparse has done. Perhaps it's because the function takes the raw arrays
> as inputs (rather than an opaque structure that can only be created by an
> analysis phase that confirms validity). For all we know, they might do 90%
> of the work synchronously and just leave the last kernel in the stream.
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