[petsc-dev] GPU preconditioners

[Matthew Knepley]

On Fri, Jan 17, 2014 at 1:29 PM, Andrea Lani <andrea.lani at gmail.com> wrote:

> Dear Devs,
>
> is the PCBJACOBI solver fully ported to GPU in the latest petsc-dev
> version? if not, is there any intention to do so in the near future?
>
> I have a convection-dominated (with strong discontinuities in the flow
> field) MHD problem where PCASM and PCBJACOBI both work fine with KSPGMRES.
>

These can be done on the GPU, but the key is the inner PC. Right now, we
have no ILU0 or equivalent, which I think is what
you want. You can try the AMG variants, but I am guessing they would not be
great for convection dominated flow.

Maybe Karl has a better suggestion?

  Thanks,

     Matt


> Looking for a speedup in my code (which is using a petsc-dev version about
> two-months old), the only GPU alternative I found was PCJACOBI. This is
> indeed considerably faster on GPU, but does not converge (neither does,
> consistently, its CPU counterpart) if not for a few iterations before
> blowing up. Any other alternative for GPU-based preconditioners or solvers
> worth trying at the moment?
>
> Thanks in advance for your advice
>
> Andrea
>
>
>
> --
> Dr. Andrea
> Lani
> Senior Research Engineer, PhD
> Aeronautics & Aerospace dept., CFD group
> Von Karman Institute for Fluid Dynamics
> Chausse de Waterloo 72,
> B-1640, Rhode-Saint-Genese,  Belgium
> fax  : +32-2-3599600
>  work : +32-2-3599769
> *lani at vki.ac.be <lani at vki.ac.be>*
>



-- 
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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