EPSArnoldiSetDelayed#

Activates or deactivates delayed reorthogonalization in the Arnoldi iteration.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSArnoldiSetDelayed(EPS eps,PetscBool delayed)

Logically Collective

Input Parameters#

  • eps - the linear eigensolver context

  • delayed - boolean flag

Options Database Key#

  • -eps_arnoldi_delayed - Activates delayed reorthogonalization in EPSARNOLDI

Note#

Delayed reorthogonalization is an aggressive optimization for the EPSARNOLDI eigensolver than may provide better scalability, but sometimes makes the solver converge more slowly compared to the default algorithm. The details can be found in [Hernández et al., 2007].

References#

[Her07]

V. Hernández, J. E. Román, and A. Tomás. Parallel Arnoldi eigensolvers with enhanced scalability via global communications rearrangement. Parallel Comput., 33(7-8):521–540, 2007. doi:10.1016/j.parco.2007.04.004.

See Also#

EPS: Eigenvalue Problem Solver, EPSARNOLDI, EPSArnoldiGetDelayed()

Level#

advanced

Location#

src/eps/impls/krylov/arnoldi/arnoldi.c

Implementations#

EPSArnoldiSetDelayed_Arnoldi() in src/eps/impls/krylov/arnoldi/arnoldi.c

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