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 <bs> - sets the maximux allowed block size

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.

See the documentation of PRIMME [Stathopoulos and McCombs, 2010] for details.

References#

[Sta10]

A. Stathopoulos and J. R. McCombs. PRIMME: PReconditioned Iterative MultiMethod Eigensolver: methods and software description. ACM Trans. Math. Software, 37(2):21:1–21:30, 2010. doi:10.1145/1731022.1731031.

See Also#

SVD: Singular Value Decomposition, SVDPRIMME, SVDPRIMMEGetBlockSize()

Level#

advanced

Location#

src/svd/impls/external/primme/svdprimme.c

Implementations#

SVDPRIMMESetBlockSize_PRIMME() in src/svd/impls/external/primme/svdprimme.c

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