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amg4psblas/amgprec/impl/amg_dfile_prec_descr.f90

217 lines
7.3 KiB
Fortran

!
!
! AMG4PSBLAS version 1.0
! Algebraic Multigrid Package
! based on PSBLAS (Parallel Sparse BLAS version 3.7)
!
! (C) Copyright 2021
!
! Salvatore Filippone
! Pasqua D'Ambra
! Fabio Durastante
!
! 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 AMG4PSBLAS 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 AMG4PSBLAS 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: amg_dfile_prec_descr.f90
!
!
! Subroutine: amg_file_prec_descr
! Version: real
!
! This routine prints a description of the preconditioner to the standard
! output or to a file. It must be called after the preconditioner has been
! built by amg_precbld.
!
! Arguments:
! p - type(amg_Tprec_type), input.
! The preconditioner data structure to be printed out.
! info - integer, output.
! error code.
! iout - integer, input, optional.
! The id of the file where the preconditioner description
! will be printed. If iout is not present, then the standard
! output is condidered.
! root - integer, input, optional.
! The id of the process printing the message; -1 acts as a wildcard.
! Default is psb_root_
!
!
!
! verbosity:
! <0: suppress all messages
! 0: normal
! >1: increased details
!
subroutine amg_dfile_prec_descr(prec,iout,root, verbosity)
use psb_base_mod
use amg_d_prec_mod, amg_protect_name => amg_dfile_prec_descr
use amg_d_inner_mod
use amg_d_gs_solver
implicit none
! Arguments
class(amg_dprec_type), intent(in) :: prec
integer(psb_ipk_), intent(in), optional :: iout
integer(psb_ipk_), intent(in), optional :: root
integer(psb_ipk_), intent(in), optional :: verbosity
! Local variables
integer(psb_ipk_) :: ilev, nlev, ilmin, info, nswps
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: me, np
logical :: is_symgs
character(len=20), parameter :: name='amg_file_prec_descr'
integer(psb_ipk_) :: iout_, root_, verbosity_
info = psb_success_
if (present(iout)) then
iout_ = iout
else
iout_ = psb_out_unit
end if
if (iout_ < 0) iout_ = psb_out_unit
if (present(verbosity)) then
verbosity_ = verbosity
else
verbosity_ = 0
end if
if (verbosity_ < 0) goto 9998
ctxt = prec%ctxt
if (allocated(prec%precv)) then
call psb_info(ctxt,me,np)
if (present(root)) then
root_ = root
else
root_ = psb_root_
end if
if (root_ == -1) root_ = me
if (verbosity_ >=0) then
!
! The preconditioner description is printed by processor psb_root_.
! This agrees with the fact that all the parameters defining the
! preconditioner have the same values on all the procs (this is
! ensured by amg_precbld).
!
if (me == root_) then
nlev = size(prec%precv)
do ilev = 1, nlev
if (.not.allocated(prec%precv(ilev)%sm)) then
info = 3111
write(iout_,*) ' ',name,&
& ': error: inconsistent MLPREC part, should call amg_PRECINIT'
return
endif
end do
write(iout_,*)
write(iout_,'(a)') 'Preconditioner description'
if (nlev == 1) then
!
! Here we have a gigantic kludge just to handle Symmetrized Gauss-Seidel.
! Will need rethinking...
!
if (allocated(prec%precv(1)%sm2a)) then
is_symgs = .false.
select type(sv2 => prec%precv(1)%sm2a%sv)
class is (amg_d_bwgs_solver_type)
select type(sv1 => prec%precv(1)%sm%sv)
class is (amg_d_gs_solver_type)
is_symgs = .true.
end select
end select
if (is_symgs) then
write(iout_,*) ' Forward-Backward (symmetrized) Hybrid Gauss-Seidel'
else
write(iout_,*) 'Pre Smoother: '
call prec%precv(1)%sm%descr(info,iout=iout_)
write(iout_,*) 'Post smoother:'
call prec%precv(1)%sm2a%descr(info,iout=iout_)
end if
nswps = max(prec%precv(1)%parms%sweeps_pre,prec%precv(1)%parms%sweeps_post)
else
call prec%precv(1)%sm%descr(info,iout=iout_)
nswps = prec%precv(1)%parms%sweeps_pre
end if
if (nswps > 1) write(iout_,*) ' Number of sweeps : ',nswps
write(iout_,*)
else if (nlev > 1) then
!
! Print description of base preconditioner
!
write(iout_,*) 'Multilevel Preconditioner'
write(iout_,*) 'Outer sweeps:',prec%outer_sweeps
write(iout_,*)
if (allocated(prec%precv(1)%sm2a)) then
write(iout_,*) 'Pre Smoother: '
call prec%precv(1)%sm%descr(info,iout=iout_)
write(iout_,*) 'Post smoother:'
call prec%precv(1)%sm2a%descr(info,iout=iout_)
else
write(iout_,*) 'Smoother: '
call prec%precv(1)%sm%descr(info,iout=iout_)
end if
!
! Print multilevel details
!
write(iout_,*)
write(iout_,*) 'Multilevel hierarchy: '
write(iout_,*) ' Number of levels : ',nlev
write(iout_,*) ' Operator complexity: ',prec%get_complexity()
write(iout_,*) ' Average coarsening : ',prec%get_avg_cr()
ilmin = 2
if (nlev == 2) ilmin=1
do ilev=ilmin,nlev
call prec%precv(ilev)%descr(ilev,nlev,ilmin,info, &
& iout=iout_,verbosity=verbosity)
end do
write(iout_,*)
else
write(iout_,*) trim(name), &
& ': invalid preconditioner array size ?',nlev
info = -2
return
end if
end if
end if
else
write(iout_,*) trim(name), &
& ': Error: no base preconditioner available, something is wrong!'
info = -2
return
endif
9998 continue
end subroutine amg_dfile_prec_descr