KSPIDRSetS

Sets the shadow space dimension s for the KSPIDR solver.

Synopsis

#include "petscksp.h" 
PetscErrorCode KSPIDRSetS(KSP ksp, PetscInt s)

Logically Collective

Input Parameters

• ksp - the Krylov solver context

• s - shadow space dimension (default 4); must be >= 1

Options Database Key

• -ksp_idr_s s - shadow space dimension

Notes

Increasing s generally improves convergence but requires s additional vectors. If s is changed after KSPSetUp() has been called, the solver is reset automatically.

See Also

KSP: Linear System Solvers, KSPIDR, KSPIDRGetS(), KSPIDRSetRandom()

Level

intermediate

Location

src/ksp/ksp/impls/idr/idr.c

Implementations

KSPIDRSetS_IDR() in src/ksp/ksp/impls/idr/idr.c

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