[petsc-users] Does ILU(15) still make sense or should just use LU?

[Zou, Ling]

Hi, I’d like to avoid using LU, but in some cases to use ILU and still converge, I have to go to ILU(15), i.e., `-pc_factor_levels 15`. Does it still make sense, or should I give it up and switch to LU?

For this particular case, ~2k DoF, and both ILU(15) and LU perform similarly in terms of wall time.

-Ling
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