EPSPRIMMESetBlockSize#

The maximum block size that PRIMME will try to use.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSPRIMMESetBlockSize(EPS eps,PetscInt bs)

Logically Collective

Input Parameters#

eps - the linear eigensolver context
bs - block size

Options Database Key#

-eps_primme_blocksize - Sets the max allowed block size value

Notes#

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