PCREDUNDANT#
Runs a KSP
solver with preconditioner for the entire problem on subgroups of processors
Options Database Key#
-pc_redundant_number
- number of redundant solves, for example if you are using 64 MPI processes and use an n of 4 there will be 4 parallel solves each on 16 = 64/4 processes.
Notes#
Options for the redundant preconditioners can be set using the options database prefix -redundant_
The default KSP
is preonly and the default PC
is PCLU
or PCCHOLESKY
if Pmat is of type MATSBAIJ
.
PCFactorSetShiftType()
applied to this PC
will convey they shift type into the inner PC
if it is factorization based.
Developer Note#
PCSetInitialGuessNonzero()
is not used by this class but likely should be.
See Also#
PCCreate()
, PCSetType()
, PCType
, PCRedundantSetScatter()
,
PCRedundantGetKSP()
, PCRedundantGetOperators()
, PCRedundantSetNumber()
, PCREDISTRIBUTE
Level#
intermediate
Location#
src/ksp/pc/impls/redundant/redundant.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages