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194 lines
6.7 KiB
Fortran
194 lines
6.7 KiB
Fortran
7 years ago
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!
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!
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! MLD2P4 version 2.1
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! MultiLevel Domain Decomposition Parallel Preconditioners Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.5)
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!
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! (C) Copyright 2008, 2010, 2012, 2015, 2017
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!
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! Salvatore Filippone Cranfield University, UK
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! Pasqua D'Ambra IAC-CNR, Naples, IT
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! Daniela di Serafino University of Campania "L. Vanvitelli", Caserta, IT
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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 MLD2P4 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 MLD2P4 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: mld_dfile_prec_descr.f90
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!
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!
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! Subroutine: mld_file_prec_descr
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! Version: real
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!
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! This routine prints a description of the preconditioner to the standard
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! output or to a file. It must be called after the preconditioner has been
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! built by mld_precbld.
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!
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! Arguments:
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! p - type(mld_Tprec_type), input.
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! The preconditioner data structure to be printed out.
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! info - integer, output.
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! error code.
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! iout - integer, input, optional.
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! The id of the file where the preconditioner description
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! will be printed. If iout is not present, then the standard
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! output is condidered.
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! root - integer, input, optional.
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! The id of the process printing the message; -1 acts as a wildcard.
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! Default is psb_root_
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!
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subroutine mld_dfile_prec_descr(prec,iout,root)
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use psb_base_mod
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use mld_d_prec_mod, mld_protect_name => mld_dfile_prec_descr
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use mld_d_inner_mod
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use mld_d_gs_solver
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implicit none
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! Arguments
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class(mld_dprec_type), intent(in) :: prec
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integer(psb_ipk_), intent(in), optional :: iout
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integer(psb_ipk_), intent(in), optional :: root
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! Local variables
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integer(psb_ipk_) :: ilev, nlev, ilmin, info, nswps
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integer(psb_ipk_) :: ictxt, me, np
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logical :: is_symgs
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character(len=20), parameter :: name='mld_file_prec_descr'
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integer(psb_ipk_) :: iout_
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integer(psb_ipk_) :: root_
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info = psb_success_
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if (present(iout)) then
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iout_ = iout
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else
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iout_ = psb_out_unit
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end if
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if (iout_ < 0) iout_ = psb_out_unit
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ictxt = prec%ictxt
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if (allocated(prec%precv)) then
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call psb_info(ictxt,me,np)
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if (present(root)) then
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root_ = root
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else
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root_ = psb_root_
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end if
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if (root_ == -1) root_ = me
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!
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! The preconditioner description is printed by processor psb_root_.
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! This agrees with the fact that all the parameters defining the
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! preconditioner have the same values on all the procs (this is
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! ensured by mld_precbld).
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!
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if (me == root_) then
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nlev = size(prec%precv)
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do ilev = 1, nlev
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if (.not.allocated(prec%precv(ilev)%sm)) then
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info = 3111
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write(iout_,*) ' ',name,&
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& ': error: inconsistent MLPREC part, should call MLD_PRECINIT'
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return
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endif
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end do
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write(iout_,*)
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write(iout_,'(a)') 'Preconditioner description'
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if (nlev == 1) then
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!
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! Here we have a gigantic kludge just to handle Symmetrized Gauss-Seidel.
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! Will need rethinking...
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!
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if (allocated(prec%precv(1)%sm2a)) then
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is_symgs = .false.
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select type(sv2 => prec%precv(1)%sm2a%sv)
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class is (mld_d_bwgs_solver_type)
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select type(sv1 => prec%precv(1)%sm%sv)
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class is (mld_d_gs_solver_type)
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is_symgs = .true.
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end select
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end select
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if (is_symgs) then
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write(iout_,*) ' Forward-Backward (symmetrized) Hybrid Gauss-Seidel'
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else
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call prec%precv(1)%sm%descr(info,iout=iout_)
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call prec%precv(1)%sm2a%descr(info,iout=iout_)
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end if
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else
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call prec%precv(1)%sm%descr(info,iout=iout_)
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nswps = max(prec%precv(1)%parms%sweeps_pre,prec%precv(1)%parms%sweeps_post)
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end if
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nswps = max(prec%precv(1)%parms%sweeps_pre,prec%precv(1)%parms%sweeps_post)
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if (nswps > 1) write(iout_,*) ' Number of sweeps : ',nswps
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write(iout_,*)
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else if (nlev > 1) then
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!
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! Print description of base preconditioner
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!
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write(iout_,*) 'Multilevel Preconditioner'
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write(iout_,*) 'Outer sweeps:',prec%outer_sweeps
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write(iout_,*)
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write(iout_,*) 'Smoother: '
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call prec%precv(1)%sm%descr(info,iout=iout_)
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if (allocated(prec%precv(1)%sm2a)) then
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write(iout_,*) 'Post smoother:'
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call prec%precv(1)%sm2a%descr(info,iout=iout_)
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end if
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!
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! Print multilevel details
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!
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write(iout_,*)
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write(iout_,*) 'Multilevel hierarchy: '
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write(iout_,*) ' Number of levels : ',nlev
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write(iout_,*) ' Operator complexity: ',prec%get_complexity()
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ilmin = 2
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if (nlev == 2) ilmin=1
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do ilev=ilmin,nlev
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call prec%precv(ilev)%descr(ilev,nlev,ilmin,info,iout=iout_)
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end do
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write(iout_,*)
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else
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write(iout_,*) trim(name), &
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& ': invalid preconditioner array size ?',nlev
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info = -2
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return
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end if
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end if
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else
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write(iout_,*) trim(name), &
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& ': Error: no base preconditioner available, something is wrong!'
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info = -2
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return
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endif
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end subroutine mld_dfile_prec_descr
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