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

[Mark Adams]

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?

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?

Thanks,
Mark


> but lots of people
> will need AIJ so it's certainly worthwhile.
>
> Mark Adams <mfadams at lbl.gov> writes:
>
> > Is there any plans/interest in assembling AIJ matrices on GPUs?
> >
> > I have a somewhat strangely balanced FE operator and I have each thread
> > block create one element matrix, one thread per integration point with an
> > expensive computation at each integration point. Then I assemble the
> > matrices on the CPU.
> >
> > I want to parallelize assembly on GPU machines, with coloring or DD I
> > assume. Does anyone else care about this?
> >
> > Thanks,
> > Mark
>
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