WIP: Add a Multilevel schwarz preconditioner #1431
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This PR uses the distributed coarse level generation from PGM to use as a coarse level for the additive Schwarz preconditioner. The only requirement is that the galerkin product generator ($RAP$ ) generate a
multigrid::MultigridLevel
which is a triplet ofrestrict
,prolong
andcoarse
operators. The user additionally also needs to set the solver for the coarse level.TODO
Possible issues