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amg4psblas/mlprec/impl/mld_sprecinit.F90

214 lines
7.6 KiB
Fortran

!
!
! MLD2P4 version 2.1
! MultiLevel Domain Decomposition Parallel Preconditioners Package
! based on PSBLAS (Parallel Sparse BLAS version 3.5)
!
! (C) Copyright 2008, 2010, 2012, 2015, 2017
!
! Salvatore Filippone Cranfield University, UK
! Pasqua D'Ambra IAC-CNR, Naples, IT
! Daniela di Serafino University of Campania "L. Vanvitelli", Caserta, IT
!
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions
! are met:
! 1. Redistributions of source code must retain the above copyright
! notice, this list of conditions and the following disclaimer.
! 2. Redistributions in binary form must reproduce the above copyright
! notice, this list of conditions, and the following disclaimer in the
! documentation and/or other materials provided with the distribution.
! 3. The name of the MLD2P4 group or the names of its contributors may
! not be used to endorse or promote products derived from this
! software without specific written permission.
!
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MLD2P4 GROUP OR ITS CONTRIBUTORS
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! POSSIBILITY OF SUCH DAMAGE.
!
!
! File: mld_sprecinit.f90
!
! Subroutine: mld_sprecinit
! Version: real
!
! This routine allocates and initializes the preconditioner data structure,
! according to the preconditioner type chosen by the user.
!
! A default preconditioner is set for each preconditioner type
! specified by the user:
!
! 'NOPREC' - no preconditioner
!
! 'DIAG', 'JACOBI' - diagonal/Jacobi
!
! 'GS', 'FBGS' - Hybrid Gauss-Seidel, also symmetrized
!
! 'BJAC' - block Jacobi preconditioner, with ILU(0)
! on the local blocks
!
! 'AS' - Additive Schwarz (AS), with
! overlap 1 and ILU(0) on the local submatrices
!
! 'ML' - Multilevel hybrid preconditioner (additive on the
! same level and multiplicative through the levels),
! with 2 levels, pre and post-smoothing, RAS with
! overlap 1 and ILU(0) on the local blocks is
! applied as post-smoother at each level, but the
! coarsest one; four sweeps of the block-Jacobi solver,
! with LU from UMFPACK on the blocks, are applied at
! the coarsest level, on the distributed coarse matrix.
! The smoothed aggregation algorithm with threshold 0
! is used to build the coarse matrix.
!
! For the multilevel preconditioners, the levels are numbered in increasing
! order starting from the finest one, i.e. level 1 is the finest level.
!
!
! Arguments:
! p - type(mld_sprec_type), input/output.
! The preconditioner data structure.
! ptype - character(len=*), input.
! The type of preconditioner. Its values are 'NOPREC',
! 'DIAG', 'BJAC', 'AS', 'ML' (and the corresponding
! lowercase strings).
! info - integer, output.
! Error code.
!
subroutine mld_sprecinit(prec,ptype,info)
use psb_base_mod
use mld_s_prec_mod, mld_protect_name => mld_sprecinit
use mld_s_jac_smoother
use mld_s_as_smoother
use mld_s_id_solver
use mld_s_diag_solver
use mld_s_ilu_solver
use mld_s_gs_solver
#if defined(HAVE_SLU_)
use mld_s_slu_solver
#endif
implicit none
! Arguments
class(mld_sprec_type), intent(inout) :: prec
character(len=*), intent(in) :: ptype
integer(psb_ipk_), intent(out) :: info
! Local variables
integer(psb_ipk_) :: nlev_, ilev_
real(psb_spk_) :: thr
character(len=*), parameter :: name='mld_precinit'
info = psb_success_
if (allocated(prec%precv)) then
call prec%free(info)
if (info /= psb_success_) then
! Do we want to do something?
endif
endif
prec%min_coarse_size = -1
select case(psb_toupper(ptype(1:len_trim(ptype))))
case ('NOPREC','NONE')
nlev_ = 1
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
allocate(mld_s_base_smoother_type :: prec%precv(ilev_)%sm, stat=info)
if (info /= psb_success_) return
allocate(mld_s_id_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
call prec%precv(ilev_)%default()
case ('JAC','DIAG','JACOBI')
nlev_ = 1
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
allocate(mld_s_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
if (info /= psb_success_) return
allocate(mld_s_diag_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
call prec%precv(ilev_)%default()
case ('GS','FWGS')
nlev_ = 1
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
allocate(mld_s_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
if (info /= psb_success_) return
allocate(mld_s_gs_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
call prec%precv(ilev_)%default()
case ('BWGS')
nlev_ = 1
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
allocate(mld_s_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
if (info /= psb_success_) return
allocate(mld_s_bwgs_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
call prec%precv(ilev_)%default()
case ('FBGS')
nlev_ = 1
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
call prec%set('SMOOTHER_TYPE','FBGS',info)
call prec%precv(ilev_)%default()
case ('BJAC')
nlev_ = 1
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
allocate(mld_s_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
if (info /= psb_success_) return
allocate(mld_s_ilu_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
call prec%precv(ilev_)%default()
case ('AS')
nlev_ = 1
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
allocate(mld_s_as_smoother_type :: prec%precv(ilev_)%sm, stat=info)
if (info /= psb_success_) return
allocate(mld_s_ilu_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
call prec%precv(ilev_)%default()
case ('ML')
nlev_ = prec%max_levs
ilev_ = 1
allocate(prec%precv(nlev_),stat=info)
do ilev_ = 1, nlev_
call prec%precv(ilev_)%default()
end do
call prec%set('ML_CYCLE','VCYCLE',info)
call prec%set('SMOOTHER_TYPE','FBGS',info)
#if defined(HAVE_MUMPS_)
call prec%set('COARSE_SOLVE','MUMPS',info)
#elif defined(HAVE_SLU_)
call prec%set('COARSE_SOLVE','SLU',info)
#else
call prec%set('COARSE_SOLVE','ILU',info)
#endif
!call prec%precv(nlev_)%default()
case default
write(psb_err_unit,*) name,&
&': Warning: Unknown preconditioner type request "',ptype,'"'
info = psb_err_pivot_too_small_
end select
end subroutine mld_sprecinit