"Alan Z. Wei" <[email protected]> writes: > As you mentioned that the redundant LU for the coarse grid solver > primarily cause the large memory request for the 2-level case. How could > I change the coarse grid solver to reduce the memory requirement or > speed up the solver.
You should use more levels or coarsen faster. You cannot have a scalable method with a huge coarse level. You could try switch to algebraic multigrid on the coarse levels if geometric is not converging well.
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