NEPCISSSetSizes#

Sets the values of various size parameters in the CISS solver.

Synopsis#

#include "slepcnep.h" 
PetscErrorCode NEPCISSSetSizes(NEP nep,PetscInt ip,PetscInt bs,PetscInt ms,PetscInt npart,PetscInt bsmax,PetscBool realmats)

Logically Collective

Input Parameters#

  • nep - the nonlinear eigensolver context

  • ip - number of integration points

  • bs - block size

  • ms - moment size

  • npart - number of partitions when splitting the communicator

  • bsmax - max block size

  • realmats - \(T(z)\) is real for real \(z\)

Options Database Keys#

  • -nep_ciss_integration_points <ip> - sets the number of integration points

  • -nep_ciss_blocksize <bs> - sets the block size

  • -nep_ciss_moments <ms> - sets the moment size

  • -nep_ciss_partitions <npart> - sets the number of partitions

  • -nep_ciss_maxblocksize <bsmax> - sets the maximum block size

  • -nep_ciss_realmats - \(T(z)\) is real for real \(z\)

Notes#

For all integer arguments, you can use PETSC_CURRENT to keep the current value, and PETSC_DETERMINE to set them to a default value.

The default number of partitions is 1. This means the internal KSP object is shared among all processes of the NEP communicator. Otherwise, the communicator is split into npart communicators, so that npart KSP solves proceed simultaneously.

The realmats flag can be set to PETSC_TRUE when \(T(\cdot)\) is guaranteed to be real when the argument is a real value, for example, when all matrices in the split form are real. When set to PETSC_TRUE, the solver avoids some computations.

For a detailed description of the parameters see [Maeda et al., 2016].

References#

[Mae16]

Y. Maeda, T. Sakurai, and J. E. Roman. Contour integral spectrum slicing method in SLEPc. Technical Report STR-11, Universitat Politècnica de València, 2016. URL: https://slepc.upv.es/documentation.

See Also#

NEP: Nonlinear Eigenvalue Problems, NEPCISS, NEPCISSGetSizes()

Level#

advanced

Location#

src/nep/impls/ciss/nciss.c

Implementations#

NEPCISSSetSizes_CISS() in src/nep/impls/ciss/nciss.c

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