PCGASM#
Use the (restricted) additive Schwarz method, each block is (approximately) solved with its own KSP
object on a subset of MPI ranks
Options Database Keys#
-pc_gasm_total_subdomains
- Sets total number of local subdomains to be distributed among MPI ranks-pc_gasm_view_subdomains - activates the printing of subdomain indices in
PCView()
, -ksp_view or -snes_view-pc_gasm_print_subdomains - activates the printing of subdomain indices in
PCSetUp()
-pc_gasm_overlap
- Sets overlap by which to (automatically) extend local subdomains-pc_gasm_type [basic,restrict,interpolate,none] - Sets
PCGASMType
Notes#
To set options on the solvers for each block append -sub_
to all the KSP
, and PC
options database keys. For example, -sub_pc_type ilu -sub_pc_factor_levels 1 -sub_ksp_type preonly
To set the options on the solvers separate for each block call PCGASMGetSubKSP()
and set the options directly on the resulting KSP
object (you can access its PC
with KSPGetPC()
)
References#
**** -*** M Dryja, OB Widlund, An additive variant of the Schwarz alternating method for the case of many subregions Courant Institute, New York University Technical report
**** -*** Barry Smith, Petter Bjorstad, and William Gropp, Domain Decompositions: Parallel Multilevel Methods for Elliptic Partial Differential Equations, Cambridge University Press.
See Also#
PCCreate()
, PCSetType()
, PCType
, PC
, PCASM
, PCGASMType
, PCGASMSetType()
,
PCBJACOBI
, PCGASMGetSubKSP()
, PCGASMSetSubdomains()
,
PCSetModifySubMatrices()
, PCGASMSetOverlap()
, PCGASMSetType()
Level#
beginner
Location#
Examples#
src/ksp/ksp/tutorials/ex62.c
src/ksp/ksp/tutorials/ex64.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages