! ! ! MLD2P4 version 2.1 ! MultiLevel Domain Decomposition Parallel Preconditioners Package ! based on PSBLAS (Parallel Sparse BLAS version 3.4) ! ! (C) Copyright 2008, 2010, 2012, 2015, 2017 ! ! Salvatore Filippone Cranfield University ! Ambra Abdullahi Hassan University of Rome Tor Vergata ! Alfredo Buttari CNRS-IRIT, Toulouse ! Pasqua D'Ambra ICAR-CNR, Naples ! Daniela di Serafino University of Campania "L. Vanvitelli", Caserta ! ! 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' - diagonal preconditioner ! ! 'PJAC' - point Jacobi preconditioner ! ! 'BJAC' - block Jacobi preconditioner, with ILU(0) ! on the local blocks ! ! 'AS' - Restricted Additive Schwarz (RAS), 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 #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 ('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