hecmw_precond_saamg_coarse Module Reference

Smoothed Aggregation AMG preconditioner : coarsest-level solver. More...

Functions/Subroutines
subroutine, public	hecmw_saamg_coarse_setup (Ac, symmetric, cs)
	Densify Ac and factor it: symmetric -> LDL^T (dsytrf), else -> LU (dgetrf, for a non-symmetric coarse operator). bcsr_to_dense yields the full matrix, so LU is correct for non-symmetric A (dsytrf would use only the lower triangle). More...
subroutine, public	hecmw_saamg_coarse_solve (cs, b, x)
	Solve Ac x = b using the stored LDL^T factors. More...
subroutine, public	hecmw_saamg_coarse_free (cs)

Detailed Description

Smoothed Aggregation AMG preconditioner : coarsest-level solver.

Abstract coarsest-solver interface (setup_structure / setup_values / solve); the first backend is a redundant dense symmetric LDL^T factorization (LAPACK dsytrf/dsytrs). dsytrf (not dpotrf) is used so the same backend handles the symmetric-indefinite coarse matrices of the future u-p extension. In the MPI phase the coarse matrix will be Allgather'd and factored redundantly on every rank; here (sequential) the level matrix is simply densified in place.

Function/Subroutine Documentation

hecmw_saamg_coarse_free()

subroutine, public hecmw_precond_saamg_coarse::hecmw_saamg_coarse_free

(

type(hecmwst_saamg_coarse), intent(inout)

cs

)

Definition at line 134 of file hecmw_precond_SAAMG_coarse.F90.

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hecmw_saamg_coarse_setup()

subroutine, public hecmw_precond_saamg_coarse::hecmw_saamg_coarse_setup	(	type(hecmwst_saamg_bcsr), intent(in)	Ac,
		logical, intent(in)	symmetric,
		type(hecmwst_saamg_coarse), intent(out)	cs
	)

Densify Ac and factor it: symmetric -> LDL^T (dsytrf), else -> LU (dgetrf, for a non-symmetric coarse operator). bcsr_to_dense yields the full matrix, so LU is correct for non-symmetric A (dsytrf would use only the lower triangle).

Definition at line 41 of file hecmw_precond_SAAMG_coarse.F90.

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hecmw_saamg_coarse_solve()

subroutine, public hecmw_precond_saamg_coarse::hecmw_saamg_coarse_solve	(	type(hecmwst_saamg_coarse), intent(in)	cs,
		real(kind=kreal), dimension(:), intent(in)	b,
		real(kind=kreal), dimension(:), intent(out)	x
	)

Solve Ac x = b using the stored LDL^T factors.

Definition at line 110 of file hecmw_precond_SAAMG_coarse.F90.

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