EPSEVSLSetSlices#

Set the number of slices in which the interval must be subdivided.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSEVSLSetSlices(EPS eps,PetscInt nslices)

Logically Collective

Input Parameters#

  • eps - the linear eigensolver context

  • nslices - the number of slices

Options Database Key#

  • -eps_evsl_slices <nslices> - set the number of slices

Notes#

By default, one slice per MPI process is used. Depending on the number of eigenvalues, using more slices may be beneficial, but very narrow subintervals imply higher polynomial degree.

See the documentation of EVSL [Li et al., 2019] for details.

References#

[Li19]

R. Li, Y. Xi, L. Erlandson, and Y. Saad. The eigenvalues slicing library (EVSL): algorithms, implementation, and software. SIAM J. Sci. Comput., 41(4):C393–C415, 2019. doi:10.1137/18M1170935.

See Also#

EPS: Eigenvalue Problem Solver, EPSEVSL, EPSEVSLGetSlices()

Level#

advanced

Location#

src/eps/impls/external/evsl/evsl.c

Implementations#

EPSEVSLSetSlices_EVSL() in src/eps/impls/external/evsl/evsl.c

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