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259 lines
8.8 KiB
Fortran
259 lines
8.8 KiB
Fortran
!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.7)
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!
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! (C) Copyright 2021
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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! File: amg_dprecinit.f90
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!
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! Subroutine: amg_dprecinit
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! Version: real
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!
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! This routine allocates and initializes the preconditioner data structure,
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! according to the preconditioner type chosen by the user.
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!
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! A default preconditioner is set for each preconditioner type
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! specified by the user:
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!
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! 'NOPREC' - no preconditioner
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!
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! 'DIAG', 'JACOBI' - diagonal/Jacobi
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!
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! 'L1-DIAG', 'L1-JACOBI' - diagonal/Jacobi with L1 norm correction
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!
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! 'GS', 'FBGS' - Hybrid Gauss-Seidel, also symmetrized
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!
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! 'BJAC' - block Jacobi preconditioner, with ILU(0)
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! on the local blocks
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!
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! 'L1-BJAC' - block Jacobi preconditioner, with ILU(0)
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! on the local blocks and L1 correction for off-diag blocks
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!
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! 'AS' - Additive Schwarz (AS), with
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! overlap 1 and ILU(0) on the local submatrices
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!
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! 'ML' - Multilevel hybrid preconditioner (additive on the
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! same level and multiplicative through the levels),
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! with 2 levels, pre and post-smoothing, RAS with
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! overlap 1 and ILU(0) on the local blocks is
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! applied as post-smoother at each level, but the
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! coarsest one; four sweeps of the block-Jacobi solver,
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! with LU from UMFPACK on the blocks, are applied at
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! the coarsest level, on the distributed coarse matrix.
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! The smoothed aggregation algorithm with threshold 0
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! is used to build the coarse matrix.
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!
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! For the multilevel preconditioners, the levels are numbered in increasing
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! order starting from the finest one, i.e. level 1 is the finest level.
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!
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!
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! Arguments:
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! p - type(amg_dprec_type), input/output.
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! The preconditioner data structure.
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! ptype - character(len=*), input.
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! The type of preconditioner. Its values are 'NOPREC',
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! 'DIAG', 'BJAC', 'AS', 'ML' (and the corresponding
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! lowercase strings).
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! info - integer, output.
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! Error code.
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!
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subroutine amg_dprecinit(ctxt,prec,ptype,info)
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use psb_base_mod
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use amg_d_prec_mod, amg_protect_name => amg_dprecinit
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use amg_d_jac_smoother
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use amg_d_as_smoother
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use amg_d_id_solver
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use amg_d_diag_solver
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use amg_d_ilu_solver
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use amg_d_gs_solver
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#if defined(HAVE_UMF_)
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use amg_d_umf_solver
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#endif
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#if defined(HAVE_SLU_)
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use amg_d_slu_solver
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#endif
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implicit none
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! Arguments
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type(psb_ctxt_type), intent(in) :: ctxt
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class(amg_dprec_type), intent(inout) :: prec
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character(len=*), intent(in) :: ptype
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integer(psb_ipk_), intent(out) :: info
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! Local variables
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integer(psb_ipk_) :: nlev_, ilev_
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integer(psb_ipk_) :: err_act
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integer(psb_ipk_) :: debug_level, debug_unit
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real(psb_dpk_) :: thr
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character(len=*), parameter :: name='amg_precinit'
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info = psb_success_
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call psb_erractionsave(err_act)
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if (psb_errstatus_fatal()) then
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info = psb_err_internal_error_; goto 9999
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end if
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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if (allocated(prec%precv)) then
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call prec%free(info)
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if (info /= psb_success_) then
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! Do we want to do something?
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endif
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endif
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prec%ctxt = ctxt
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call prec%ag_data%default()
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select case(psb_toupper(trim(ptype)))
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case ('NOPREC','NONE')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_base_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_id_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('JAC','DIAG','JACOBI')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_diag_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('L1-DIAG','L1-JACOBI','L1_DIAG','L1_JACOBI')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_l1_diag_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('GS','FWGS')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_gs_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('BWGS')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_bwgs_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('FBGS')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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call prec%set('SMOOTHER_TYPE','FBGS',info)
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call prec%precv(ilev_)%default()
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case ('BJAC')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_ilu_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('L1-BJAC','L1_BJAC')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_l1_jac_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_ilu_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('AS')
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nlev_ = 1
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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allocate(amg_d_as_smoother_type :: prec%precv(ilev_)%sm, stat=info)
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if (info /= psb_success_) return
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allocate(amg_d_ilu_solver_type :: prec%precv(ilev_)%sm%sv, stat=info)
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call prec%precv(ilev_)%default()
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case ('ML')
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nlev_ = prec%ag_data%max_levs
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ilev_ = 1
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allocate(prec%precv(nlev_),stat=info)
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if (info /= psb_success_ ) then
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call psb_errpush(info,name,a_err='Error from hierarchy init')
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goto 9999
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endif
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do ilev_ = 1, nlev_
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call prec%precv(ilev_)%default()
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end do
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call prec%set('ML_CYCLE','VCYCLE',info)
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call prec%set('SMOOTHER_TYPE','FBGS',info)
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#if defined(HAVE_UMF_)
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call prec%set('COARSE_SOLVE','UMF',info)
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#elif defined(HAVE_MUMPS_)
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call prec%set('COARSE_SOLVE','MUMPS',info)
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#elif defined(HAVE_SLU_)
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call prec%set('COARSE_SOLVE','SLU',info)
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#else
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call prec%set('COARSE_SOLVE','ILU',info)
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#endif
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case default
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write(psb_err_unit,*) name,&
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&': Warning: Unknown preconditioner type request "',ptype,'"'
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info = psb_err_pivot_too_small_
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end select
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine amg_dprecinit
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