Fazlul Huq writes:
> Thanks.
>
> I have tried with large problem also (10^7 X 10^7). Even then I got
> cholesky faster than multigrid.
> But, the problem is 1D. May be that's the reason.
Exactly. Cholesky is O(n) with a very small constant in 1D, O(n^{3/2})
in 2D, and O(n^2) in 3D.
Fazlul Huq via petsc-users writes:
> Hello PETSc Developers,
>
> I am trying to solve a poisson equation using "-pc_type cholesky" and
> "-pc_type hypre -pc_hypre_type boomeramg" and I got that cholesky
> decomposition method takes
> less time then multigrid method.
> Is this expected?
For smal
