Preconditioner - ICC

Usage:

-pc_type icc

Options:

-pc_factor_levels

levels of fill. Default = 0

-pc_factor_fill

Expected fill in factorization. Default = 1

-pc_factor_mat_ordering_type

Reorder to reduce nonzeros in ICC: (one of)
natural
nd
1wd
rcm
qmd
rowlength

-pc_factor_shift_nonzero

Shift added to diagonal. Default = 0

-pc_factor_shift_positive_definite

Manteuffel shift applied to diagonal

-pc_factor_zeropivot

Pivot is considered zero if less than ?. Default = 1e-12

Info:

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