petsc-3.7.1 2016-05-15
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# PCREDUNDANT

Runs a KSP solver with preconditioner for the entire problem on subgroups of processors Options for the redundant preconditioners can be set with -redundant_pc_xxx for the redundant KSP with -redundant_ksp_xxx Many br

### Options Database

-pc_redundant_number <n> -number of redundant solves, for example if you are using 64 MPI processes and Many bruse an n of 4 there will be 4 parallel solves each on 16 = 64/4 processes. Many br

Many br

Notes: The default KSP is preonly and the default PC is LU. Many br

PCFactorSetShiftType() applied to this PC will convey they shift type into the inner PC if it is factorization based. Many br

Developer Notes: Note that PCSetInitialGuessNonzero() is not used by this class but likely should be. Many br

### See Also

PCCreate(), PCSetType(), PCType (for list of available types), PCRedundantSetScatter(),
PCRedundantGetKSP(), PCRedundantGetOperators(), PCRedundantSetNumber() Many br

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