SVDPRIMMESetBlockSize#

The maximum block size that PRIMME will try to use.

Synopsis#

#include "slepcsvd.h" 
PetscErrorCode SVDPRIMMESetBlockSize(SVD svd,PetscInt bs)

Logically Collective

Input Parameters#

svd - the singular value solver context
bs - block size

Options Database Key#

-svd_primme_blocksize - Sets the max allowed block size value

Notes#

If the block size is not set, the value established by primme_svds_initialize is used.

The user should set the block size based on the architecture specifics of the target computer, as well as any a priori knowledge of multiplicities. The code does NOT require bs > 1 to find multiple eigenvalues. For some methods, keeping bs = 1 yields the best overall performance.