[petsc-users] Replacement for Euclid ?

[Michel Kern]

Thanks Mat, 

according tot he hypre documentation, pilut is "no longer supported by the hypre team", as less efficient than Euclid, so I wouldn't consider an option. I wsa looking for a "natural" upgrade path. 

The problems we've looked at for the moment can be up to a few millions cells (that's the size of the pressure block, the saturation block is larger, but should be easier to solve). We're aiming for 10^6 cells, and 10^3 cores. 
Yes, direct methods deserve a second look ! 

Michel 

----- Mail original -----

> On Tue, Feb 7, 2017 at 2:49 AM, Michel Kern < michel.kern at inria.fr > wrote:

> > I have a code that uses euclid for ILU preconditioning (as part of a
> > CPR-AMG
> > preconditioner for a mulitphase flow solver). As noted in the release
> > notes,
> > euclid is no longer supported starting from 3.6. What is the recommended
> > replacement ? Is block Jacobi plus a local solver an alternative ?
> 

> There is pilut from Hypre.

> How big is the problem? Did you try sparse direct on it (SuperLU, MUMPS)?

> Thanks,

> Matt

> > Thanks
> 
> > Michel
> 

> > --
> 
> > Michel Kern
> 
> > Centre de Recherche Inria de Paris, Maison de la Simulation
> 
> > 2 rue Simone Iff, bureau A413, Digiteo Labs, bât 565, CEA Saclay
> 
> > 75012 Paris 91191 Gif-sur-Yvette cedex
> 
> > tel. : +33 (0)1 80 49 42 36 , tel. : +33 (0)1 69 08 58 32
> 

> --
> 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

-- 
Michel Kern 
Centre de recherche Inria de Paris, Maison de la Simulation, 
2 rue Simone Iff, bureau A413, Digiteo Labs, bât. 565, CEA Saclay 
75012 Paris 91191 Gif-sur-Yvette Cedex 
tel. : +33 (0)1 80 49 42 36, tel. : +33 (0)1 69 08 58 32 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20170207/efa3ccb1/attachment.html>