petsc-3.12.5 2020-03-29
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KSPGMRESSetPreAllocateVectors

 Causes GMRES and FGMRES to preallocate all its needed work vectors at initial setup rather than the default, which is to allocate them in chunks when needed.

Synopsis

#include "petscksp.h"  
PetscErrorCode  KSPGMRESSetPreAllocateVectors(KSP ksp)
Logically Collective on ksp

Input Parameter

ksp -iterative context obtained from KSPCreate

Options Database Key

-ksp_gmres_preallocate -Activates KSPGmresSetPreAllocateVectors()

See Also

KSPGMRESSetRestart(), KSPGMRESSetOrthogonalization(), KSPGMRESGetOrthogonalization()

Level

intermediate

Location

src/ksp/ksp/impls/gmres/gmpre.c

Implementations

KSPGMRESSetPreAllocateVectors_GMRES in src/ksp/ksp/impls/gmres/gmres.c

Index of all KSP routines
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Index of all manual pages