KSP#
Abstract PETSc object that manages the linear solves in PETSc (even those such as direct factorization-based solvers that do not use Krylov accelerators).
Synopsis#
typedef struct _p_KSP *KSP;
Notes#
When a direct solver is used, but no Krylov solver is used, the KSP object is still used but with a
KSPType of KSPPREONLY (or equivalently KSPNONE), meaning that only application of the preconditioner is used as the linear solver.
Use KSPSetType() or the options database key -ksp_type to set the specific Krylov solver algorithm to use with a given KSP object
The PC object is used to control preconditioners in PETSc.
KSP can also be used to solve some least squares problems (over or under-determined linear systems), using, for example, KSPLSQR, see PETSCREGRESSORLINEAR
for additional methods that can be used to solve least squares problems and other linear regressions).
See Also#
Summary of Sparse Linear Solvers Available In PETSc, KSP: Linear System Solvers, KSPCreate(), KSPSetType(), KSPType, SNES, TS, PC, KSP, KSPDestroy(), KSPCG, KSPGMRES
Level#
beginner
Location#
Examples#
src/ksp/ksp/tutorials/ex22f.F90
src/ksp/ksp/tutorials/ex9.c
src/ksp/ksp/tutorials/ex19.c
src/ksp/ksp/tutorials/ex7f.F90
src/ksp/ksp/tutorials/ex13.c
src/ksp/ksp/tutorials/ex3.c
src/ksp/ksp/tutorials/ex55.c
src/ksp/ksp/tutorials/ex45.c
src/ksp/ksp/tutorials/ex81a.c
Implementations#
_p_KSP in include/petsc/private/kspimpl.h
KSP_BCGS in src/ksp/ksp/impls/bcgs/bcgsimpl.h
KSP_BCGSL in src/ksp/ksp/impls/bcgsl/bcgslimpl.h
KSP_CG in src/ksp/ksp/impls/cg/cgimpl.h
KSP_CGLS in src/ksp/ksp/impls/cg/cgls.c
KSP_Chebyshev in src/ksp/ksp/impls/cheby/chebyshevimpl.h
KSP_FCG in src/ksp/ksp/impls/fcg/fcgimpl.h
KSP_PIPEFCG in src/ksp/ksp/impls/fcg/pipefcg/pipefcgimpl.h
KSP_FETIDPMon in src/ksp/ksp/impls/fetidp/fetidp.c
KSP_FETIDP in src/ksp/ksp/impls/fetidp/fetidp.c
KSP_GCR in src/ksp/ksp/impls/gcr/gcr.c
KSP_PIPEGCR in src/ksp/ksp/impls/gcr/pipegcr/pipegcrimpl.h
KSP_AGMRES in src/ksp/ksp/impls/gmres/agmres/agmresimpl.h
KSP_DGMRES in src/ksp/ksp/impls/gmres/dgmres/dgmresimpl.h
KSP_FGMRES in src/ksp/ksp/impls/gmres/fgmres/fgmresimpl.h
KSP_GMRES in src/ksp/ksp/impls/gmres/gmresimpl.h
KSP_LGMRES in src/ksp/ksp/impls/gmres/lgmres/lgmresimpl.h
KSP_PGMRES in src/ksp/ksp/impls/gmres/pgmres/pgmresimpl.h
KSP_PIPEFGMRES in src/ksp/ksp/impls/gmres/pipefgmres/pipefgmresimpl.h
KSP_LCD in src/ksp/ksp/impls/lcd/lcdimpl.h
KSP_LSQR in src/ksp/ksp/impls/lsqr/lsqr.c
KSP_MINRES in src/ksp/ksp/impls/minres/minres.c
KSP_QCG in src/ksp/ksp/impls/qcg/qcgimpl.h
KSP_Richardson in src/ksp/ksp/impls/rich/richardsonimpl.h
KSP_SYMMLQ in src/ksp/ksp/impls/symmlq/symmlq.c
KSP_TSIRM in src/ksp/ksp/impls/tsirm/tsirm.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages