amg4psblas/amgprec/amg_s_poly_smoother.f90

!
!
!                             AMG4PSBLAS version 1.0
!    Algebraic Multigrid Package
!               based on PSBLAS (Parallel Sparse BLAS version 3.7)
!
!    (C) Copyright 2021
!
!        Salvatore Filippone
!        Pasqua D'Ambra
!        Daniela di Serafino
!
!    Redistribution and use in source and binary forms, with or without
!    modification, are permitted provided that the following conditions
!    are met:
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!
! File: amg_s_poly_smoother_mod.f90
!
! Module: amg_s_poly_smoother_mod
!
!  This module defines:
!    the amg_s_poly_smoother_type data structure containing the
!    smoother for a Jacobi/block Jacobi smoother.
!  The smoother stores in ND the block off-diagonal matrix.
!  One special case is treated separately, when the solver is DIAG or L1-DIAG
!  then the ND is the entire off-diagonal part of the matrix (including the
!  main diagonal block), so that it becomes possible to implement
!  a pure Jacobi or L1-Jacobi global solver.
!
module amg_s_poly_smoother
  use amg_s_base_smoother_mod
  use amg_d_poly_coeff_mod
  
  type, extends(amg_s_base_smoother_type) :: amg_s_poly_smoother_type
    ! The local solver component is inherited from the
    ! parent type.
    !    class(amg_s_base_solver_type), allocatable :: sv
    !
    integer(psb_ipk_)              :: pdegree, variant
    integer(psb_ipk_)              :: rho_estimate=amg_poly_rho_est_power_
    integer(psb_ipk_)              :: rho_estimate_iterations=10
    type(psb_sspmat_type), pointer :: pa => null()
    real(psb_spk_), allocatable    :: poly_beta(:)
    real(psb_spk_)                 :: cf_a = szero
    real(psb_spk_)                 :: rho_ba = -sone
  contains
    procedure, pass(sm) :: apply_v => amg_s_poly_smoother_apply_vect
!!$    procedure, pass(sm) :: apply_a => amg_s_poly_smoother_apply
    procedure, pass(sm) :: dump    => amg_s_poly_smoother_dmp
    procedure, pass(sm) :: build   => amg_s_poly_smoother_bld
    procedure, pass(sm) :: cnv     => amg_s_poly_smoother_cnv
    procedure, pass(sm) :: clone   => amg_s_poly_smoother_clone
    procedure, pass(sm) :: clone_settings => amg_s_poly_smoother_clone_settings
    procedure, pass(sm) :: clear_data     => amg_s_poly_smoother_clear_data  
    procedure, pass(sm) :: free    => s_poly_smoother_free
    procedure, pass(sm) :: cseti   => amg_s_poly_smoother_cseti
    procedure, pass(sm) :: csetc   => amg_s_poly_smoother_csetc
    procedure, pass(sm) :: csetr   => amg_s_poly_smoother_csetr
    procedure, pass(sm) :: descr   => amg_s_poly_smoother_descr
    procedure, pass(sm) :: sizeof  => s_poly_smoother_sizeof
    procedure, pass(sm) :: default => s_poly_smoother_default
    procedure, pass(sm) :: get_nzeros => s_poly_smoother_get_nzeros
    procedure, pass(sm) :: get_wrksz => s_poly_smoother_get_wrksize
    procedure, nopass   :: get_fmt    => s_poly_smoother_get_fmt
    procedure, nopass   :: get_id     => s_poly_smoother_get_id
  end type amg_s_poly_smoother_type
  private :: s_poly_smoother_free, &
       & s_poly_smoother_sizeof,  s_poly_smoother_get_nzeros, &
       & s_poly_smoother_get_fmt, s_poly_smoother_get_id, &
       & s_poly_smoother_get_wrksize


  interface
    subroutine amg_s_poly_smoother_apply_vect(alpha,sm,x,beta,y,desc_data,trans,&
         & sweeps,work,wv,info,init,initu)
      import :: psb_desc_type, amg_s_poly_smoother_type, psb_s_vect_type, psb_spk_, &
           & psb_sspmat_type, psb_s_base_sparse_mat, psb_s_base_vect_type,&
           & psb_ipk_

      type(psb_desc_type), intent(in)                 :: desc_data
      class(amg_s_poly_smoother_type), intent(inout) :: sm
      type(psb_s_vect_type),intent(inout)           :: x
      type(psb_s_vect_type),intent(inout)           :: y
      real(psb_spk_),intent(in)                      :: alpha,beta
      character(len=1),intent(in)                     :: trans
      integer(psb_ipk_), intent(in)                   :: sweeps
      real(psb_spk_),target, intent(inout)           :: work(:)
      type(psb_s_vect_type),intent(inout)           :: wv(:)
      integer(psb_ipk_), intent(out)                  :: info
      character, intent(in), optional                :: init
      type(psb_s_vect_type),intent(inout), optional   :: initu
    end subroutine amg_s_poly_smoother_apply_vect
  end interface

!!$  interface
!!$    subroutine amg_s_poly_smoother_apply(alpha,sm,x,beta,y,desc_data,trans,&
!!$         & sweeps,work,info,init,initu)
!!$      import :: psb_desc_type, amg_s_poly_smoother_type, psb_s_vect_type, psb_spk_, &
!!$           & psb_sspmat_type, psb_s_base_sparse_mat, psb_s_base_vect_type, &
!!$           & psb_ipk_
!!$      type(psb_desc_type), intent(in)      :: desc_data
!!$      class(amg_s_poly_smoother_type), intent(inout) :: sm
!!$      real(psb_spk_),intent(inout)         :: x(:)
!!$      real(psb_spk_),intent(inout)         :: y(:)
!!$      real(psb_spk_),intent(in)            :: alpha,beta
!!$      character(len=1),intent(in)           :: trans
!!$      integer(psb_ipk_), intent(in)         :: sweeps
!!$      real(psb_spk_),target, intent(inout) :: work(:)
!!$      integer(psb_ipk_), intent(out)        :: info
!!$      character, intent(in), optional       :: init
!!$      real(psb_spk_),intent(inout), optional :: initu(:)
!!$    end subroutine amg_s_poly_smoother_apply
!!$  end interface
!!$
  
  interface
    subroutine amg_s_poly_smoother_bld(a,desc_a,sm,info,amold,vmold,imold)
      import :: psb_desc_type, amg_s_poly_smoother_type, psb_s_vect_type, psb_spk_, &
           & psb_sspmat_type, psb_s_base_sparse_mat, psb_s_base_vect_type,&
           & psb_ipk_, psb_i_base_vect_type
      type(psb_sspmat_type), intent(in), target           :: a
      Type(psb_desc_type), Intent(inout)                  :: desc_a
      class(amg_s_poly_smoother_type), intent(inout)       :: sm
      integer(psb_ipk_), intent(out)                      :: info
      class(psb_s_base_sparse_mat), intent(in), optional :: amold
      class(psb_s_base_vect_type), intent(in), optional  :: vmold
      class(psb_i_base_vect_type), intent(in), optional  :: imold
    end subroutine amg_s_poly_smoother_bld
  end interface

  interface
    subroutine amg_s_poly_smoother_cnv(sm,info,amold,vmold,imold)
      import :: amg_s_poly_smoother_type, psb_spk_, &
           & psb_s_base_sparse_mat, psb_s_base_vect_type,&
           & psb_ipk_, psb_i_base_vect_type
      class(amg_s_poly_smoother_type), intent(inout)       :: sm
      integer(psb_ipk_), intent(out)                      :: info
      class(psb_s_base_sparse_mat), intent(in), optional :: amold
      class(psb_s_base_vect_type), intent(in), optional  :: vmold
      class(psb_i_base_vect_type), intent(in), optional  :: imold
    end subroutine amg_s_poly_smoother_cnv
  end interface

  interface
    subroutine amg_s_poly_smoother_dmp(sm,desc,level,info,prefix,head,smoother,solver,global_num)
      import :: psb_sspmat_type, psb_s_vect_type, psb_s_base_vect_type, &
           & psb_spk_, amg_s_poly_smoother_type, psb_epk_, psb_desc_type, &
           & psb_ipk_
      implicit none
      class(amg_s_poly_smoother_type), intent(in) :: sm
      type(psb_desc_type), intent(in)               :: desc
      integer(psb_ipk_), intent(in)               :: level
      integer(psb_ipk_), intent(out)              :: info
      character(len=*), intent(in), optional :: prefix, head
      logical, optional, intent(in)    :: smoother, solver, global_num
    end subroutine amg_s_poly_smoother_dmp
  end interface

  interface
    subroutine amg_s_poly_smoother_clone(sm,smout,info)
      import :: amg_s_poly_smoother_type, psb_spk_, &
           & amg_s_base_smoother_type, psb_ipk_
      class(amg_s_poly_smoother_type), intent(inout)               :: sm
      class(amg_s_base_smoother_type), allocatable, intent(inout) :: smout
      integer(psb_ipk_), intent(out)                :: info
    end subroutine amg_s_poly_smoother_clone
  end interface

  interface
    subroutine amg_s_poly_smoother_clone_settings(sm,smout,info)
      import :: amg_s_poly_smoother_type, psb_spk_, &
           & amg_s_base_smoother_type, psb_ipk_
      class(amg_s_poly_smoother_type), intent(inout)               :: sm
      class(amg_s_base_smoother_type), allocatable, intent(inout) :: smout
      integer(psb_ipk_), intent(out)                :: info
    end subroutine amg_s_poly_smoother_clone_settings
  end interface

  interface
    subroutine amg_s_poly_smoother_clear_data(sm,info)
      import :: amg_s_poly_smoother_type, psb_spk_, &
           & amg_s_base_smoother_type, psb_ipk_
      class(amg_s_poly_smoother_type), intent(inout)               :: sm
      integer(psb_ipk_), intent(out)                :: info
    end subroutine amg_s_poly_smoother_clear_data
  end interface

  interface
    subroutine amg_s_poly_smoother_descr(sm,info,iout,coarse,prefix)
      import :: amg_s_poly_smoother_type, psb_ipk_
      class(amg_s_poly_smoother_type), intent(in) :: sm
      integer(psb_ipk_), intent(out)               :: info
      integer(psb_ipk_), intent(in), optional      :: iout
      logical, intent(in), optional                :: coarse
      character(len=*), intent(in), optional       :: prefix
    end subroutine amg_s_poly_smoother_descr
  end interface

  interface
    subroutine amg_s_poly_smoother_cseti(sm,what,val,info,idx)
      import :: psb_sspmat_type, psb_s_vect_type, psb_s_base_vect_type, &
           & psb_spk_, amg_s_poly_smoother_type, psb_epk_, psb_desc_type, psb_ipk_
      implicit none
      class(amg_s_poly_smoother_type), intent(inout) :: sm
      character(len=*), intent(in)                   :: what
      integer(psb_ipk_), intent(in)                  :: val
      integer(psb_ipk_), intent(out)                 :: info
      integer(psb_ipk_), intent(in), optional        :: idx
    end subroutine amg_s_poly_smoother_cseti
  end interface

  interface
    subroutine amg_s_poly_smoother_csetc(sm,what,val,info,idx)
      import :: psb_sspmat_type, psb_s_vect_type, psb_s_base_vect_type, &
           & psb_spk_, amg_s_poly_smoother_type, psb_epk_, psb_desc_type, psb_ipk_
      implicit none
      class(amg_s_poly_smoother_type), intent(inout) :: sm
      character(len=*), intent(in)                   :: what
      character(len=*), intent(in)                   :: val
      integer(psb_ipk_), intent(out)                 :: info
      integer(psb_ipk_), intent(in), optional        :: idx
    end subroutine amg_s_poly_smoother_csetc
  end interface

  interface
    subroutine amg_s_poly_smoother_csetr(sm,what,val,info,idx)
      import :: psb_sspmat_type, psb_s_vect_type, psb_s_base_vect_type, &
           & psb_spk_, amg_s_poly_smoother_type, psb_epk_, psb_desc_type, psb_ipk_
      implicit none
      class(amg_s_poly_smoother_type), intent(inout) :: sm
      character(len=*), intent(in)                   :: what
      real(psb_spk_), intent(in)                   :: val
      integer(psb_ipk_), intent(out)                 :: info
      integer(psb_ipk_), intent(in), optional        :: idx
    end subroutine amg_s_poly_smoother_csetr
  end interface


contains


  subroutine s_poly_smoother_free(sm,info)


    Implicit None

    ! Arguments
    class(amg_s_poly_smoother_type), intent(inout) :: sm
    integer(psb_ipk_), intent(out)                  :: info
    integer(psb_ipk_) :: err_act
    character(len=20)  :: name='s_poly_smoother_free'

    call psb_erractionsave(err_act)
    info = psb_success_



    if (allocated(sm%sv)) then
      call sm%sv%free(info)
      if (info == psb_success_) deallocate(sm%sv,stat=info)
      if (info /= psb_success_) then
        info = psb_err_alloc_dealloc_
        call psb_errpush(info,name)
        goto 9999
      end if
    end if
    if (allocated(sm%poly_beta))  deallocate(sm%poly_beta)
    sm%pa => null()

    call psb_erractionrestore(err_act)
    return

9999 call psb_error_handler(err_act)
    return
  end subroutine s_poly_smoother_free

  function s_poly_smoother_sizeof(sm) result(val)

    implicit none
    ! Arguments
    class(amg_s_poly_smoother_type), intent(in) :: sm
    integer(psb_epk_) :: val

    val = psb_sizeof_dp
    if (allocated(sm%sv)) val = val + sm%sv%sizeof()
    if (allocated(sm%poly_beta)) val = val + psb_sizeof_dp * size(sm%poly_beta)

    return
  end function s_poly_smoother_sizeof

  subroutine s_poly_smoother_default(sm)

    Implicit None

    ! Arguments
    class(amg_s_poly_smoother_type), intent(inout) :: sm

    !
    ! Default: BJAC with no residual check
    !
    sm%pdegree      = 1
    sm%rho_ba       = -sone
    sm%variant      = amg_poly_lottes_
    sm%rho_estimate = amg_poly_rho_est_power_
    sm%rho_estimate_iterations = 20
    if (allocated(sm%sv)) then
      call sm%sv%default()
    end if

    return
  end subroutine s_poly_smoother_default

  function s_poly_smoother_get_nzeros(sm) result(val)

    implicit none
    ! Arguments
    class(amg_s_poly_smoother_type), intent(in) :: sm
    integer(psb_epk_) :: val
    integer(psb_ipk_)        :: i

    val = 0
    if (allocated(sm%sv)) val = val + sm%sv%get_nzeros()

    return
  end function s_poly_smoother_get_nzeros

  function s_poly_smoother_get_wrksize(sm) result(val)
    implicit none
    class(amg_s_poly_smoother_type), intent(inout) :: sm
    integer(psb_ipk_)  :: val

    val = 4
    if (allocated(sm%sv)) val = val + sm%sv%get_wrksz()

  end function s_poly_smoother_get_wrksize

  function s_poly_smoother_get_fmt() result(val)
    implicit none
    character(len=32)  :: val

    val = "Polynomial smoother"
  end function s_poly_smoother_get_fmt

  function s_poly_smoother_get_id() result(val)
    implicit none
    integer(psb_ipk_)  :: val

    val = amg_poly_
  end function s_poly_smoother_get_id


end module amg_s_poly_smoother