[petsc-users] Parallel dense solve with submatrices

Matthew Knepley knepley at gmail.com
Mon Aug 28 09:01:31 CDT 2017

On Mon, Aug 28, 2017 at 9:17 AM, Toon Weyens <weyenst at gmail.com> wrote:

> Very interesting! I might try this afterwards, with H2lib.
> Also, I must say that the strumpack interface looks promising. What did
> you mean by "only for the sparse part", by the way? Also, any idea when it
> is going to be released in an official petsc release, preferably with some
> documentation?

I thought STRUMPACK was in 3.7.6


> Thanks!
> On Mon, Aug 28, 2017 at 12:15 PM Jose E. Roman <jroman at dsic.upv.es> wrote:
>> > El 28 ago 2017, a las 10:15, Toon Weyens <weyenst at gmail.com> escribió:
>> >
>> > Thank you Barry, that explains why I couldn't find information about
>> it. I am now going to implement this straight-forward implementation as a
>> first step.
>> >
>> > In the long term it would in any case be useful to have a solver that
>> uses H-matrices, such as H2lib.
>> >
>> > Is there any chance Petsc is thinking about moving to this kind of
>> matrices as well in the future?
>> >
>> >
>> You can use H2lib in a PETSc program by wrapping it in a shell matrix. We
>> did this some time ago https://doi.org/10.1016/j.cam.2012.07.021
>> Also, PETSc has an interface to STRUMPACK, but only to the sparse part
>> and I guess what you need is the dense part.
>> Jose

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

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