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

Input Parameter#

  • ksp - iterative context obtained from KSPCreate

Options Database Key#

  • -ksp_gmres_preallocate - Activates KSPGmresSetPreAllocateVectors()

See Also#

KSP: Linear System Solvers, KSPGMRESSetRestart(), KSPGMRESSetOrthogonalization(), KSPGMRESGetOrthogonalization()

Level#

intermediate

Location#

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

Implementations#

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

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