petsc-3.7.3 2016-07-24
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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()

### Keywords

GMRES, preallocate, vectors

### See Also

KSPGMRESSetRestart(), KSPGMRESSetOrthogonalization(), KSPGMRESGetOrthogonalization()

Level:intermediate
Location: src/ksp/ksp/impls/gmres/gmpre.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages