[petsc-dev] Mat assembly on GPUs ...

[Jed Brown]

Mark Adams <mfadams at lbl.gov> writes:

> On Sun, Mar 29, 2020 at 6:20 PM Jed Brown <jed at jedbrown.org> wrote:
>
>> We are interested in assembling point-block diagonals for use in
>> pbjacobi smoothing.  This is much simpler than AIJ,
>
>
> Would the coloring/DD algo on the outside be the same, just with a
> different assembly kernel?

In one mode, though we can also do analytic stuff on the inside to avoid
coloring (in which case we produce a bunch of elements or block-diagonal
blocks).

> Or are you looking a fusing the element construction with assembly? That
> seems reasonable now that I think about it.
>
> It's the same coloring, right?
>
> And, do we have an appropriate coloring method now?

Are you asking for a GPU-native coloring?  Does your nonzero pattern
change frequently?