!!$ !!$ !!$ MLD2P4 version 2.0 !!$ MultiLevel Domain Decomposition Parallel Preconditioners Package !!$ based on PSBLAS (Parallel Sparse BLAS version 3.0) !!$ !!$ (C) Copyright 2008,2009,2010 !!$ !!$ Salvatore Filippone University of Rome Tor Vergata !!$ Alfredo Buttari CNRS-IRIT, Toulouse !!$ Pasqua D'Ambra ICAR-CNR, Naples !!$ Daniela di Serafino Second University of Naples !!$ !!$ 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. 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File: mld_z_onelev_mod.f90 ! ! Module: mld_z_onelev_mod ! ! This module defines: ! - the mld_z_onelev_type data structure containing one level ! of a multilevel preconditioner and related ! data structures; ! ! It contains routines for ! - Building and applying; ! - checking if the preconditioner is correctly defined; ! - printing a description of the preconditioner; ! - deallocating the preconditioner data structure. ! module mld_z_onelev_mod use mld_base_prec_type use mld_z_base_smoother_mod use psb_base_mod, only : psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, psb_long_int_k_, psb_desc_type ! ! ! Type: mld_Tonelev_type. ! ! It is the data type containing the necessary items for the current ! level (essentially, the smoother, the current-level matrix ! and the restriction and prolongation operators). ! ! type mld_Tonelev_type ! class(mld_T_base_smoother_type), allocatable :: sm ! type(mld_RTml_parms) :: parms ! type(psb_Tspmat_type) :: ac ! type(psb_Tesc_type) :: desc_ac ! type(psb_Tspmat_type), pointer :: base_a => null() ! type(psb_Tesc_type), pointer :: base_desc => null() ! type(psb_Tlinmap_type) :: map ! end type mld_Tonelev_type ! ! Note that psb_Tpk denotes the kind of the real data type to be chosen ! according to single/double precision version of MLD2P4. ! ! sm - class(mld_T_base_smoother_type), allocatable ! The current level preconditioner (aka smoother). ! parms - type(mld_RTml_parms) ! The parameters defining the multilevel strategy. ! ac - The local part of the current-level matrix, built by ! coarsening the previous-level matrix. ! desc_ac - type(psb_desc_type). ! The communication descriptor associated to the matrix ! stored in ac. ! base_a - type(psb_Tspmat_type), pointer. ! Pointer (really a pointer!) to the local part of the current ! matrix (so we have a unified treatment of residuals). ! We need this to avoid passing explicitly the current matrix ! to the routine which applies the preconditioner. ! base_desc - type(psb_desc_type), pointer. ! Pointer to the communication descriptor associated to the ! matrix pointed by base_a. ! map - Stores the maps (restriction and prolongation) between the ! vector spaces associated to the index spaces of the previous ! and current levels. ! ! Methods: ! Most methods follow the encapsulation hierarchy: they take whatever action ! is appropriate for the current object, then call the corresponding method for ! the contained object. ! As an example: the descr() method prints out a description of the ! level. It starts by invoking the descr() method of the parms object, ! then calls the descr() method of the smoother object. ! ! descr - Prints a description of the object. ! default - Set default values ! dump - Dump to file object contents ! set - Sets various parameters; when a request is unknown ! it is passed to the smoother object for further processing. ! check - Sanity checks. ! sizeof - Total memory occupation in bytes ! get_nzeros - Number of nonzeros ! ! type mld_z_onelev_type class(mld_z_base_smoother_type), allocatable :: sm type(mld_dml_parms) :: parms type(psb_zspmat_type) :: ac type(psb_desc_type) :: desc_ac type(psb_zspmat_type), pointer :: base_a => null() type(psb_desc_type), pointer :: base_desc => null() type(psb_zlinmap_type) :: map contains procedure, pass(lv) :: descr => mld_z_base_onelev_descr procedure, pass(lv) :: default => z_base_onelev_default procedure, pass(lv) :: free => mld_z_base_onelev_free procedure, pass(lv) :: nullify => z_base_onelev_nullify procedure, pass(lv) :: check => mld_z_base_onelev_check procedure, pass(lv) :: dump => mld_z_base_onelev_dump procedure, pass(lv) :: seti => mld_z_base_onelev_seti procedure, pass(lv) :: setr => mld_z_base_onelev_setr procedure, pass(lv) :: setc => mld_z_base_onelev_setc generic, public :: set => seti, setr, setc procedure, pass(lv) :: sizeof => z_base_onelev_sizeof procedure, pass(lv) :: get_nzeros => z_base_onelev_get_nzeros end type mld_z_onelev_type private :: z_base_onelev_default, z_base_onelev_sizeof, & & z_base_onelev_nullify, z_base_onelev_get_nzeros interface subroutine mld_z_base_onelev_descr(lv,il,nl,info,iout) import :: psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, mld_z_onelev_type, psb_long_int_k_, psb_desc_type Implicit None ! Arguments class(mld_z_onelev_type), intent(in) :: lv integer, intent(in) :: il,nl integer, intent(out) :: info integer, intent(in), optional :: iout end subroutine mld_z_base_onelev_descr end interface interface subroutine mld_z_base_onelev_free(lv,info) import :: psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, mld_z_onelev_type, psb_long_int_k_, psb_desc_type implicit none class(mld_z_onelev_type), intent(inout) :: lv integer, intent(out) :: info end subroutine mld_z_base_onelev_free end interface interface subroutine mld_z_base_onelev_check(lv,info) import :: psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, mld_z_onelev_type, psb_long_int_k_, psb_desc_type Implicit None ! Arguments class(mld_z_onelev_type), intent(inout) :: lv integer, intent(out) :: info end subroutine mld_z_base_onelev_check end interface interface subroutine mld_z_base_onelev_seti(lv,what,val,info) import :: psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, mld_z_onelev_type, psb_long_int_k_, psb_desc_type Implicit None ! Arguments class(mld_z_onelev_type), intent(inout) :: lv integer, intent(in) :: what integer, intent(in) :: val integer, intent(out) :: info end subroutine mld_z_base_onelev_seti end interface interface subroutine mld_z_base_onelev_setc(lv,what,val,info) import :: psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, mld_z_onelev_type, psb_long_int_k_, psb_desc_type Implicit None ! Arguments class(mld_z_onelev_type), intent(inout) :: lv integer, intent(in) :: what character(len=*), intent(in) :: val integer, intent(out) :: info end subroutine mld_z_base_onelev_setc end interface interface subroutine mld_z_base_onelev_setr(lv,what,val,info) import :: psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, mld_z_onelev_type, psb_long_int_k_, psb_desc_type Implicit None class(mld_z_onelev_type), intent(inout) :: lv integer, intent(in) :: what real(psb_dpk_), intent(in) :: val integer, intent(out) :: info end subroutine mld_z_base_onelev_setr end interface interface subroutine mld_z_base_onelev_dump(lv,level,info,prefix,head,ac,rp,smoother,solver) import :: psb_zspmat_type, psb_z_vect_type, psb_z_base_vect_type, & & psb_zlinmap_type, psb_dpk_, mld_z_onelev_type, psb_long_int_k_, psb_desc_type implicit none class(mld_z_onelev_type), intent(in) :: lv integer, intent(in) :: level integer, intent(out) :: info character(len=*), intent(in), optional :: prefix, head logical, optional, intent(in) :: ac, rp, smoother, solver end subroutine mld_z_base_onelev_dump end interface contains ! ! Function returning the size of the mld_prec_type data structure ! in bytes or in number of nonzeros of the operator(s) involved. ! function z_base_onelev_get_nzeros(lv) result(val) implicit none class(mld_z_onelev_type), intent(in) :: lv integer(psb_long_int_k_) :: val integer :: i val = 0 if (allocated(lv%sm)) & & val = lv%sm%get_nzeros() end function z_base_onelev_get_nzeros function z_base_onelev_sizeof(lv) result(val) implicit none class(mld_z_onelev_type), intent(in) :: lv integer(psb_long_int_k_) :: val integer :: i val = 0 val = val + lv%desc_ac%sizeof() val = val + lv%ac%sizeof() val = val + lv%map%sizeof() if (allocated(lv%sm)) val = val + lv%sm%sizeof() end function z_base_onelev_sizeof subroutine z_base_onelev_nullify(lv) implicit none class(mld_z_onelev_type), intent(inout) :: lv nullify(lv%base_a) nullify(lv%base_desc) end subroutine z_base_onelev_nullify ! ! Multilevel defaults: ! multiplicative vs. additive ML framework; ! Smoothed decoupled aggregation with zero threshold; ! distributed coarse matrix; ! damping omega computed with the max-norm estimate of the ! dominant eigenvalue; ! two-sided smoothing (i.e. V-cycle) with 1 smoothing sweep; ! subroutine z_base_onelev_default(lv) Implicit None ! Arguments class(mld_z_onelev_type), intent(inout) :: lv lv%parms%sweeps = 1 lv%parms%sweeps_pre = 1 lv%parms%sweeps_post = 1 lv%parms%ml_type = mld_mult_ml_ lv%parms%aggr_alg = mld_dec_aggr_ lv%parms%aggr_kind = mld_smooth_prol_ lv%parms%coarse_mat = mld_distr_mat_ lv%parms%smoother_pos = mld_twoside_smooth_ lv%parms%aggr_omega_alg = mld_eig_est_ lv%parms%aggr_eig = mld_max_norm_ lv%parms%aggr_filter = mld_no_filter_mat_ lv%parms%aggr_omega_val = dzero lv%parms%aggr_thresh = dzero if (allocated(lv%sm)) call lv%sm%default() return end subroutine z_base_onelev_default end module mld_z_onelev_mod