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amg4psblas/tests/pdegen/mld_d_pde2d.f90

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!
!
! MLD2P4 version 2.2
! MultiLevel Domain Decomposition Parallel Preconditioners Package
! based on PSBLAS (Parallel Sparse BLAS version 3.5)
!
! (C) Copyright 2008-2018
!
! Salvatore Filippone
! Pasqua D'Ambra
! Daniela di Serafino
!
! 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_d_pde2d.f90
!
! Program: mld_d_pde2d
! This sample program solves a linear system obtained by discretizing a
! PDE with Dirichlet BCs.
!
!
! The PDE is a general second order equation in 2d
!
! a1 dd(u) a2 dd(u) b1 d(u) b2 d(u)
! - ------ - ------ ----- + ------ + c u = f
! dxdx dydy dx dy
!
! with Dirichlet boundary conditions
! u = g
!
! on the unit square 0<=x,y<=1.
!
!
! Note that if b1=b2=c=0., the PDE is the Laplace equation.
!
! There are three choices available for data distribution:
! 1. A simple BLOCK distribution
! 2. A ditribution based on arbitrary assignment of indices to processes,
! typically from a graph partitioner
! 3. A 2D distribution in which the unit square is partitioned
! into rectangles, each one assigned to a process.
!
module mld_d_pde2d_mod
use psb_base_mod, only : psb_dpk_, psb_ipk_, psb_desc_type,&
& psb_dspmat_type, psb_d_vect_type, dzero,&
& psb_d_base_sparse_mat, psb_d_base_vect_type, psb_i_base_vect_type
interface
function d_func_2d(x,y) result(val)
import :: psb_dpk_
real(psb_dpk_), intent(in) :: x,y
real(psb_dpk_) :: val
end function d_func_2d
end interface
interface mld_gen_pde2d
module procedure mld_d_gen_pde2d
end interface mld_gen_pde2d
contains
function d_null_func_2d(x,y) result(val)
real(psb_dpk_), intent(in) :: x,y
real(psb_dpk_) :: val
val = dzero
end function d_null_func_2d
!
! functions parametrizing the differential equation
!
!
! Note: b1 and b2 are the coefficients of the first
! derivative of the unknown function. The default
! we apply here is to have them zero, so that the resulting
! matrix is symmetric/hermitian and suitable for
! testing with CG and FCG.
! When testing methods for non-hermitian matrices you can
! change the B1/B2 functions to e.g. done/sqrt((2*done))
!
function b1(x,y)
use psb_base_mod, only : psb_dpk_, done, dzero
implicit none
real(psb_dpk_) :: b1
real(psb_dpk_), intent(in) :: x,y
b1=dzero
end function b1
function b2(x,y)
use psb_base_mod, only : psb_dpk_, done, dzero
implicit none
real(psb_dpk_) :: b2
real(psb_dpk_), intent(in) :: x,y
b2=dzero
end function b2
function c(x,y)
use psb_base_mod, only : psb_dpk_, done, dzero
implicit none
real(psb_dpk_) :: c
real(psb_dpk_), intent(in) :: x,y
c=0.d0
end function c
function a1(x,y)
use psb_base_mod, only : psb_dpk_, done, dzero
implicit none
real(psb_dpk_) :: a1
real(psb_dpk_), intent(in) :: x,y
a1=done/80
end function a1
function a2(x,y)
use psb_base_mod, only : psb_dpk_, done, dzero
implicit none
real(psb_dpk_) :: a2
real(psb_dpk_), intent(in) :: x,y
a2=done/80
end function a2
function g(x,y)
use psb_base_mod, only : psb_dpk_, done, dzero
implicit none
real(psb_dpk_) :: g
real(psb_dpk_), intent(in) :: x,y
g = dzero
if (x == done) then
g = done
else if (x == dzero) then
g = exp(-y**2)
end if
end function g
!
! subroutine to allocate and fill in the coefficient matrix and
! the rhs.
!
subroutine mld_d_gen_pde2d(ictxt,idim,a,bv,xv,desc_a,afmt,info,&
& f,amold,vmold,imold,partition,nrl,iv)
use psb_base_mod
use psb_util_mod
!
! Discretizes the partial differential equation
!
! a1 dd(u) a2 dd(u) b1 d(u) b2 d(u)
! - ------ - ------ + ----- + ------ + c u = f
! dxdx dydy dx dy
!
! with Dirichlet boundary conditions
! u = g
!
! on the unit square 0<=x,y<=1.
!
!
! Note that if b1=b2=c=0., the PDE is the Laplace equation.
!
implicit none
integer(psb_ipk_) :: idim
type(psb_dspmat_type) :: a
type(psb_d_vect_type) :: xv,bv
type(psb_desc_type) :: desc_a
integer(psb_ipk_) :: ictxt, info
character(len=*) :: afmt
procedure(d_func_2d), optional :: f
class(psb_d_base_sparse_mat), optional :: amold
class(psb_d_base_vect_type), optional :: vmold
class(psb_i_base_vect_type), optional :: imold
integer(psb_ipk_), optional :: partition, nrl,iv(:)
! Local variables.
integer(psb_ipk_), parameter :: nb=20
type(psb_d_csc_sparse_mat) :: acsc
type(psb_d_coo_sparse_mat) :: acoo
type(psb_d_csr_sparse_mat) :: acsr
real(psb_dpk_) :: zt(nb),x,y,z
integer(psb_ipk_) :: nnz,nr,nlr,i,j,ii,ib,k, partition_
integer(psb_lpk_) :: m,n,glob_row,nt
integer(psb_ipk_) :: ix,iy,iz,ia,indx_owner
! For 2D partition
! Note: integer control variables going directly into an MPI call
! must be 4 bytes, i.e. psb_mpk_
integer(psb_mpk_) :: npdims(2), npp, minfo
integer(psb_ipk_) :: npx,npy,iamx,iamy,mynx,myny
integer(psb_ipk_), allocatable :: bndx(:),bndy(:)
! Process grid
integer(psb_ipk_) :: np, iam
integer(psb_ipk_) :: icoeff
integer(psb_lpk_), allocatable :: irow(:),icol(:),myidx(:)
real(psb_dpk_), allocatable :: val(:)
! deltah dimension of each grid cell
! deltat discretization time
real(psb_dpk_) :: deltah, sqdeltah, deltah2
real(psb_dpk_), parameter :: rhs=dzero,one=done,zero=dzero
real(psb_dpk_) :: t0, t1, t2, t3, tasb, talc, ttot, tgen, tcdasb
integer(psb_ipk_) :: err_act
procedure(d_func_2d), pointer :: f_
character(len=20) :: name, ch_err,tmpfmt
info = psb_success_
name = 'create_matrix'
call psb_erractionsave(err_act)
call psb_info(ictxt, iam, np)
if (present(f)) then
f_ => f
else
f_ => d_null_func_2d
end if
deltah = done/(idim+2)
sqdeltah = deltah*deltah
deltah2 = (2*done)* deltah
if (present(partition)) then
if ((1<= partition).and.(partition <= 3)) then
partition_ = partition
else
write(*,*) 'Invalid partition choice ',partition,' defaulting to 3'
partition_ = 3
end if
else
partition_ = 3
end if
! initialize array descriptor and sparse matrix storage. provide an
! estimate of the number of non zeroes
m = (1_psb_lpk_)*idim*idim
n = m
nnz = 7*((n+np-1)/np)
if (iam == psb_root_) write(psb_out_unit,'("Generating Matrix (size=",i0,")...")')n
t0 = psb_wtime()
select case(partition_)
case(1)
! A BLOCK partition
if (present(nrl)) then
nr = nrl
else
!
! Using a simple BLOCK distribution.
!
nt = (m+np-1)/np
nr = max(0,min(nt,m-(iam*nt)))
end if
nt = nr
call psb_sum(ictxt,nt)
if (nt /= m) then
write(psb_err_unit,*) iam, 'Initialization error ',nr,nt,m
info = -1
call psb_barrier(ictxt)
call psb_abort(ictxt)
return
end if
!
! First example of use of CDALL: specify for each process a number of
! contiguous rows
!
call psb_cdall(ictxt,desc_a,info,nl=nr)
myidx = desc_a%get_global_indices()
nlr = size(myidx)
case(2)
! A partition defined by the user through IV
if (present(iv)) then
if (size(iv) /= m) then
write(psb_err_unit,*) iam, 'Initialization error: wrong IV size',size(iv),m
info = -1
call psb_barrier(ictxt)
call psb_abort(ictxt)
return
end if
else
write(psb_err_unit,*) iam, 'Initialization error: IV not present'
info = -1
call psb_barrier(ictxt)
call psb_abort(ictxt)
return
end if
!
! Second example of use of CDALL: specify for each row the
! process that owns it
!
call psb_cdall(ictxt,desc_a,info,vg=iv)
myidx = desc_a%get_global_indices()
nlr = size(myidx)
case(3)
! A 2-dimensional partition
! A nifty MPI function will split the process list
npdims = 0
call mpi_dims_create(np,2,npdims,info)
npx = npdims(1)
npy = npdims(2)
allocate(bndx(0:npx),bndy(0:npy))
! We can reuse idx2ijk for process indices as well.
call idx2ijk(iamx,iamy,iam,npx,npy,base=0)
! Now let's split the 2D square in rectangles
call dist1Didx(bndx,idim,npx)
mynx = bndx(iamx+1)-bndx(iamx)
call dist1Didx(bndy,idim,npy)
myny = bndy(iamy+1)-bndy(iamy)
! How many indices do I own?
nlr = mynx*myny
allocate(myidx(nlr))
! Now, let's generate the list of indices I own
nr = 0
do i=bndx(iamx),bndx(iamx+1)-1
do j=bndy(iamy),bndy(iamy+1)-1
nr = nr + 1
call ijk2idx(myidx(nr),i,j,idim,idim)
end do
end do
if (nr /= nlr) then
write(psb_err_unit,*) iam,iamx,iamy, 'Initialization error: NR vs NLR ',&
& nr,nlr,mynx,myny
info = -1
call psb_barrier(ictxt)
call psb_abort(ictxt)
end if
!
! Third example of use of CDALL: specify for each process
! the set of global indices it owns.
!
call psb_cdall(ictxt,desc_a,info,vl=myidx)
case default
write(psb_err_unit,*) iam, 'Initialization error: should not get here'
info = -1
call psb_barrier(ictxt)
call psb_abort(ictxt)
return
end select
if (info == psb_success_) call psb_spall(a,desc_a,info,nnz=nnz)
! define rhs from boundary conditions; also build initial guess
if (info == psb_success_) call psb_geall(xv,desc_a,info)
if (info == psb_success_) call psb_geall(bv,desc_a,info)
call psb_barrier(ictxt)
talc = psb_wtime()-t0
if (info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='allocation rout.'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
! we build an auxiliary matrix consisting of one row at a
! time; just a small matrix. might be extended to generate
! a bunch of rows per call.
!
allocate(val(20*nb),irow(20*nb),&
&icol(20*nb),stat=info)
if (info /= psb_success_ ) then
info=psb_err_alloc_dealloc_
call psb_errpush(info,name)
goto 9999
endif
! loop over rows belonging to current process in a block
! distribution.
call psb_barrier(ictxt)
t1 = psb_wtime()
do ii=1, nlr,nb
ib = min(nb,nlr-ii+1)
icoeff = 1
do k=1,ib
i=ii+k-1
! local matrix pointer
glob_row=myidx(i)
! compute gridpoint coordinates
call idx2ijk(ix,iy,glob_row,idim,idim)
! x, y coordinates
x = (ix-1)*deltah
y = (iy-1)*deltah
zt(k) = f_(x,y)
! internal point: build discretization
!
! term depending on (x-1,y)
!
val(icoeff) = -a1(x,y)/sqdeltah-b1(x,y)/deltah2
if (ix == 1) then
zt(k) = g(dzero,y)*(-val(icoeff)) + zt(k)
else
call ijk2idx(icol(icoeff),ix-1,iy,idim,idim)
irow(icoeff) = glob_row
icoeff = icoeff+1
endif
! term depending on (x,y-1)
val(icoeff) = -a2(x,y)/sqdeltah-b2(x,y)/deltah2
if (iy == 1) then
zt(k) = g(x,dzero)*(-val(icoeff)) + zt(k)
else
call ijk2idx(icol(icoeff),ix,iy-1,idim,idim)
irow(icoeff) = glob_row
icoeff = icoeff+1
endif
! term depending on (x,y)
val(icoeff)=(2*done)*(a1(x,y) + a2(x,y))/sqdeltah + c(x,y)
call ijk2idx(icol(icoeff),ix,iy,idim,idim)
irow(icoeff) = glob_row
icoeff = icoeff+1
! term depending on (x,y+1)
val(icoeff)=-a2(x,y)/sqdeltah+b2(x,y)/deltah2
if (iy == idim) then
zt(k) = g(x,done)*(-val(icoeff)) + zt(k)
else
call ijk2idx(icol(icoeff),ix,iy+1,idim,idim)
irow(icoeff) = glob_row
icoeff = icoeff+1
endif
! term depending on (x+1,y)
val(icoeff)=-a1(x,y)/sqdeltah+b1(x,y)/deltah2
if (ix==idim) then
zt(k) = g(done,y)*(-val(icoeff)) + zt(k)
else
call ijk2idx(icol(icoeff),ix+1,iy,idim,idim)
irow(icoeff) = glob_row
icoeff = icoeff+1
endif
end do
call psb_spins(icoeff-1,irow,icol,val,a,desc_a,info)
if(info /= psb_success_) exit
call psb_geins(ib,myidx(ii:ii+ib-1),zt(1:ib),bv,desc_a,info)
if(info /= psb_success_) exit
zt(:)=dzero
call psb_geins(ib,myidx(ii:ii+ib-1),zt(1:ib),xv,desc_a,info)
if(info /= psb_success_) exit
end do
tgen = psb_wtime()-t1
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='insert rout.'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
deallocate(val,irow,icol)
call psb_barrier(ictxt)
t1 = psb_wtime()
call psb_cdasb(desc_a,info,mold=imold)
tcdasb = psb_wtime()-t1
call psb_barrier(ictxt)
t1 = psb_wtime()
if (info == psb_success_) then
if (present(amold)) then
call psb_spasb(a,desc_a,info,dupl=psb_dupl_err_,mold=amold)
else
call psb_spasb(a,desc_a,info,dupl=psb_dupl_err_,afmt=afmt)
end if
end if
call psb_barrier(ictxt)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='asb rout.'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if (info == psb_success_) call psb_geasb(xv,desc_a,info,mold=vmold)
if (info == psb_success_) call psb_geasb(bv,desc_a,info,mold=vmold)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='asb rout.'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
tasb = psb_wtime()-t1
call psb_barrier(ictxt)
ttot = psb_wtime() - t0
call psb_amx(ictxt,talc)
call psb_amx(ictxt,tgen)
call psb_amx(ictxt,tasb)
call psb_amx(ictxt,ttot)
if(iam == psb_root_) then
tmpfmt = a%get_fmt()
write(psb_out_unit,'("The matrix has been generated and assembled in ",a3," format.")')&
& tmpfmt
write(psb_out_unit,'("-allocation time : ",es12.5)') talc
write(psb_out_unit,'("-coeff. gen. time : ",es12.5)') tgen
write(psb_out_unit,'("-desc asbly time : ",es12.5)') tcdasb
write(psb_out_unit,'("- mat asbly time : ",es12.5)') tasb
write(psb_out_unit,'("-total time : ",es12.5)') ttot
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end subroutine mld_d_gen_pde2d
end module mld_d_pde2d_mod
program mld_d_pde2d
use psb_base_mod
use mld_prec_mod
use psb_krylov_mod
use psb_util_mod
use data_input
use mld_d_pde2d_mod
implicit none
! input parameters
character(len=20) :: kmethd, ptype
character(len=5) :: afmt
integer(psb_ipk_) :: idim
! miscellaneous
real(psb_dpk_) :: t1, t2, tprec, thier, tslv
! sparse matrix and preconditioner
type(psb_dspmat_type) :: a
type(mld_dprec_type) :: prec
! descriptor
type(psb_desc_type) :: desc_a
! dense vectors
type(psb_d_vect_type) :: x,b,r
! parallel environment
integer(psb_ipk_) :: ictxt, iam, np
! solver parameters
integer(psb_ipk_) :: iter, itmax,itrace, istopc, irst, nlv
integer(psb_epk_) :: amatsize, precsize, descsize
real(psb_dpk_) :: err, resmx, resmxp
! Krylov solver data
type solverdata
character(len=40) :: kmethd ! Krylov solver
integer(psb_ipk_) :: istopc ! stopping criterion
integer(psb_ipk_) :: itmax ! maximum number of iterations
integer(psb_ipk_) :: itrace ! tracing
integer(psb_ipk_) :: irst ! restart
real(psb_dpk_) :: eps ! stopping tolerance
end type solverdata
type(solverdata) :: s_choice
! preconditioner data
type precdata
! preconditioner type
character(len=40) :: descr ! verbose description of the prec
character(len=10) :: ptype ! preconditioner type
integer(psb_ipk_) :: outer_sweeps ! number of outer sweeps: sweeps for 1-level,
! AMG cycles for ML
! general AMG data
character(len=16) :: mlcycle ! AMG cycle type
integer(psb_ipk_) :: maxlevs ! maximum number of levels in AMG preconditioner
! AMG aggregation
character(len=16) :: aggr_prol ! aggregation type: SMOOTHED, NONSMOOTHED
character(len=16) :: par_aggr_alg ! parallel aggregation algorithm: DEC, SYMDEC
character(len=16) :: aggr_ord ! ordering for aggregation: NATURAL, DEGREE
character(len=16) :: aggr_filter ! filtering: FILTER, NO_FILTER
real(psb_dpk_) :: mncrratio ! minimum aggregation ratio
real(psb_dpk_), allocatable :: athresv(:) ! smoothed aggregation threshold vector
integer(psb_ipk_) :: thrvsz ! size of threshold vector
real(psb_dpk_) :: athres ! smoothed aggregation threshold
integer(psb_ipk_) :: csize ! minimum size of coarsest matrix
! AMG smoother or pre-smoother; also 1-lev preconditioner
character(len=16) :: smther ! (pre-)smoother type: BJAC, AS
integer(psb_ipk_) :: jsweeps ! (pre-)smoother / 1-lev prec. sweeps
integer(psb_ipk_) :: novr ! number of overlap layers
character(len=16) :: restr ! restriction over application of AS
character(len=16) :: prol ! prolongation over application of AS
character(len=16) :: solve ! local subsolver type: ILU, MILU, ILUT,
! UMF, MUMPS, SLU, FWGS, BWGS, JAC
integer(psb_ipk_) :: fill ! fill-in for incomplete LU factorization
real(psb_dpk_) :: thr ! threshold for ILUT factorization
! AMG post-smoother; ignored by 1-lev preconditioner
character(len=16) :: smther2 ! post-smoother type: BJAC, AS
integer(psb_ipk_) :: jsweeps2 ! post-smoother sweeps
integer(psb_ipk_) :: novr2 ! number of overlap layers
character(len=16) :: restr2 ! restriction over application of AS
character(len=16) :: prol2 ! prolongation over application of AS
character(len=16) :: solve2 ! local subsolver type: ILU, MILU, ILUT,
! UMF, MUMPS, SLU, FWGS, BWGS, JAC
integer(psb_ipk_) :: fill2 ! fill-in for incomplete LU factorization
real(psb_dpk_) :: thr2 ! threshold for ILUT factorization
! coarsest-level solver
character(len=16) :: cmat ! coarsest matrix layout: REPL, DIST
character(len=16) :: csolve ! coarsest-lev solver: BJAC, SLUDIST (distr.
! mat.); UMF, MUMPS, SLU, ILU, ILUT, MILU
! (repl. mat.)
character(len=16) :: csbsolve ! coarsest-lev local subsolver: ILU, ILUT,
! MILU, UMF, MUMPS, SLU
integer(psb_ipk_) :: cfill ! fill-in for incomplete LU factorization
real(psb_dpk_) :: cthres ! threshold for ILUT factorization
integer(psb_ipk_) :: cjswp ! sweeps for GS or JAC coarsest-lev subsolver
end type precdata
type(precdata) :: p_choice
! other variables
integer(psb_ipk_) :: info, i, k
character(len=20) :: name,ch_err
info=psb_success_
call psb_init(ictxt)
call psb_info(ictxt,iam,np)
if (iam < 0) then
! This should not happen, but just in case
call psb_exit(ictxt)
stop
endif
if(psb_get_errstatus() /= 0) goto 9999
name='mld_d_pde2d'
call psb_set_errverbosity(itwo)
!
! Hello world
!
if (iam == psb_root_) then
write(*,*) 'Welcome to MLD2P4 version: ',mld_version_string_
write(*,*) 'This is the ',trim(name),' sample program'
end if
!
! get parameters
!
call get_parms(ictxt,afmt,idim,s_choice,p_choice)
!
! allocate and fill in the coefficient matrix, rhs and initial guess
!
call psb_barrier(ictxt)
t1 = psb_wtime()
call mld_gen_pde2d(ictxt,idim,a,b,x,desc_a,afmt,info)
call psb_barrier(ictxt)
t2 = psb_wtime() - t1
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='mld_gen_pde2d'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if (iam == psb_root_) &
& write(psb_out_unit,'("Overall matrix creation time : ",es12.5)')t2
if (iam == psb_root_) &
& write(psb_out_unit,'(" ")')
!
! initialize the preconditioner
!
call prec%init(ictxt,p_choice%ptype,info)
select case(trim(psb_toupper(p_choice%ptype)))
case ('NONE','NOPREC')
! Do nothing, keep defaults
case ('JACOBI','GS','FWGS','FBGS')
! 1-level sweeps from "outer_sweeps"
call prec%set('smoother_sweeps', p_choice%jsweeps, info)
case ('BJAC')
call prec%set('smoother_sweeps', p_choice%jsweeps, info)
call prec%set('sub_solve', p_choice%solve, info)
call prec%set('sub_fillin', p_choice%fill, info)
call prec%set('sub_iluthrs', p_choice%thr, info)
case('AS')
call prec%set('smoother_sweeps', p_choice%jsweeps, info)
call prec%set('sub_ovr', p_choice%novr, info)
call prec%set('sub_restr', p_choice%restr, info)
call prec%set('sub_prol', p_choice%prol, info)
call prec%set('sub_solve', p_choice%solve, info)
call prec%set('sub_fillin', p_choice%fill, info)
call prec%set('sub_iluthrs', p_choice%thr, info)
case ('ML')
! multilevel preconditioner
call prec%set('ml_cycle', p_choice%mlcycle, info)
call prec%set('outer_sweeps', p_choice%outer_sweeps,info)
if (p_choice%csize>0)&
& call prec%set('min_coarse_size', p_choice%csize, info)
if (p_choice%mncrratio>1)&
& call prec%set('min_cr_ratio', p_choice%mncrratio, info)
if (p_choice%maxlevs>0)&
& call prec%set('max_levs', p_choice%maxlevs, info)
if (p_choice%athres >= dzero) &
& call prec%set('aggr_thresh', p_choice%athres, info)
if (p_choice%thrvsz>0) then
do k=1,min(p_choice%thrvsz,size(prec%precv)-1)
call prec%set('aggr_thresh', p_choice%athresv(k), info,ilev=(k+1))
end do
end if
call prec%set('aggr_prol', p_choice%aggr_prol, info)
call prec%set('par_aggr_alg', p_choice%par_aggr_alg, info)
call prec%set('aggr_ord', p_choice%aggr_ord, info)
call prec%set('aggr_filter', p_choice%aggr_filter,info)
call prec%set('smoother_type', p_choice%smther, info)
call prec%set('smoother_sweeps', p_choice%jsweeps, info)
select case (psb_toupper(p_choice%smther))
case ('GS','BWGS','FBGS','JACOBI')
! do nothing
case default
call prec%set('sub_ovr', p_choice%novr, info)
call prec%set('sub_restr', p_choice%restr, info)
call prec%set('sub_prol', p_choice%prol, info)
call prec%set('sub_solve', p_choice%solve, info)
call prec%set('sub_fillin', p_choice%fill, info)
call prec%set('sub_iluthrs', p_choice%thr, info)
end select
if (psb_toupper(p_choice%smther2) /= 'NONE') then
call prec%set('smoother_type', p_choice%smther2, info,pos='post')
call prec%set('smoother_sweeps', p_choice%jsweeps2, info,pos='post')
select case (psb_toupper(p_choice%smther2))
case ('GS','BWGS','FBGS','JACOBI')
! do nothing
case default
call prec%set('sub_ovr', p_choice%novr2, info,pos='post')
call prec%set('sub_restr', p_choice%restr2, info,pos='post')
call prec%set('sub_prol', p_choice%prol2, info,pos='post')
call prec%set('sub_solve', p_choice%solve2, info,pos='post')
call prec%set('sub_fillin', p_choice%fill2, info,pos='post')
call prec%set('sub_iluthrs', p_choice%thr2, info,pos='post')
end select
end if
call prec%set('coarse_solve', p_choice%csolve, info)
if (psb_toupper(p_choice%csolve) == 'BJAC') &
& call prec%set('coarse_subsolve', p_choice%csbsolve, info)
call prec%set('coarse_mat', p_choice%cmat, info)
call prec%set('coarse_fillin', p_choice%cfill, info)
call prec%set('coarse_iluthrs', p_choice%cthres, info)
call prec%set('coarse_sweeps', p_choice%cjswp, info)
end select
! build the preconditioner
call psb_barrier(ictxt)
t1 = psb_wtime()
call prec%hierarchy_build(a,desc_a,info)
thier = psb_wtime()-t1
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_hierarchy_bld')
goto 9999
end if
call psb_barrier(ictxt)
t1 = psb_wtime()
call prec%smoothers_build(a,desc_a,info)
tprec = psb_wtime()-t1
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='mld_smoothers_bld')
goto 9999
end if
call psb_amx(ictxt, thier)
call psb_amx(ictxt, tprec)
if(iam == psb_root_) then
write(psb_out_unit,'(" ")')
write(psb_out_unit,'("Preconditioner: ",a)') trim(p_choice%descr)
write(psb_out_unit,'("Preconditioner time: ",es12.5)')thier+tprec
write(psb_out_unit,'(" ")')
end if
!
! iterative method parameters
!
call psb_barrier(ictxt)
t1 = psb_wtime()
call psb_krylov(s_choice%kmethd,a,prec,b,x,s_choice%eps,&
& desc_a,info,itmax=s_choice%itmax,iter=iter,err=err,itrace=s_choice%itrace,&
& istop=s_choice%istopc,irst=s_choice%irst)
call psb_barrier(ictxt)
tslv = psb_wtime() - t1
call psb_amx(ictxt,tslv)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='solver routine'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call psb_barrier(ictxt)
tslv = psb_wtime() - t1
call psb_amx(ictxt,tslv)
! compute residual norms
call psb_geall(r,desc_a,info)
call r%zero()
call psb_geasb(r,desc_a,info)
call psb_geaxpby(done,b,dzero,r,desc_a,info)
call psb_spmm(-done,a,x,done,r,desc_a,info)
resmx = psb_genrm2(r,desc_a,info)
resmxp = psb_geamax(r,desc_a,info)
amatsize = a%sizeof()
descsize = desc_a%sizeof()
precsize = prec%sizeof()
call psb_sum(ictxt,amatsize)
call psb_sum(ictxt,descsize)
call psb_sum(ictxt,precsize)
call prec%descr(iout=psb_out_unit)
if (iam == psb_root_) then
write(psb_out_unit,'("Computed solution on ",i8," processors")') np
write(psb_out_unit,'("Krylov method : ",a)') trim(s_choice%kmethd)
write(psb_out_unit,'("Preconditioner : ",a)') trim(p_choice%descr)
write(psb_out_unit,'("Iterations to convergence : ",i12)') iter
write(psb_out_unit,'("Relative error estimate on exit : ",es12.5)') err
write(psb_out_unit,'("Number of levels in hierarchy : ",i12)') prec%get_nlevs()
write(psb_out_unit,'("Time to build hierarchy : ",es12.5)') thier
write(psb_out_unit,'("Time to build smoothers : ",es12.5)') tprec
write(psb_out_unit,'("Total time for preconditioner : ",es12.5)') tprec+thier
write(psb_out_unit,'("Time to solve system : ",es12.5)') tslv
write(psb_out_unit,'("Time per iteration : ",es12.5)') tslv/iter
write(psb_out_unit,'("Total time : ",es12.5)') tslv+tprec+thier
write(psb_out_unit,'("Residual 2-norm : ",es12.5)') resmx
write(psb_out_unit,'("Residual inf-norm : ",es12.5)') resmxp
write(psb_out_unit,'("Total memory occupation for A : ",i12)') amatsize
write(psb_out_unit,'("Total memory occupation for DESC_A : ",i12)') descsize
write(psb_out_unit,'("Total memory occupation for PREC : ",i12)') precsize
write(psb_out_unit,'("Storage format for A : ",a )') a%get_fmt()
write(psb_out_unit,'("Storage format for DESC_A : ",a )') desc_a%get_fmt()
end if
!
! cleanup storage and exit
!
call psb_gefree(b,desc_a,info)
call psb_gefree(x,desc_a,info)
call psb_spfree(a,desc_a,info)
call prec%free(info)
call psb_cdfree(desc_a,info)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='free routine'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call psb_exit(ictxt)
stop
9999 continue
call psb_error(ictxt)
contains
!
! get iteration parameters from standard input
!
!
! get iteration parameters from standard input
!
subroutine get_parms(icontxt,afmt,idim,solve,prec)
implicit none
integer(psb_ipk_) :: icontxt, idim
character(len=*) :: afmt
type(solverdata) :: solve
type(precdata) :: prec
integer(psb_ipk_) :: iam, nm, np, inp_unit
character(len=1024) :: filename
call psb_info(icontxt,iam,np)
if (iam == psb_root_) then
if (command_argument_count()>0) then
call get_command_argument(1,filename)
inp_unit = 30
open(inp_unit,file=filename,action='read',iostat=info)
if (info /= 0) then
write(psb_err_unit,*) 'Could not open file ',filename,' for input'
call psb_abort(icontxt)
stop
else
write(psb_err_unit,*) 'Opened file ',trim(filename),' for input'
end if
else
inp_unit=psb_inp_unit
end if
! read input data
!
call read_data(afmt,inp_unit) ! matrix storage format
call read_data(idim,inp_unit) ! Discretization grid size
! Krylov solver data
call read_data(solve%kmethd,inp_unit) ! Krylov solver
call read_data(solve%istopc,inp_unit) ! stopping criterion
call read_data(solve%itmax,inp_unit) ! max num iterations
call read_data(solve%itrace,inp_unit) ! tracing
call read_data(solve%irst,inp_unit) ! restart
call read_data(solve%eps,inp_unit) ! tolerance
! preconditioner type
call read_data(prec%descr,inp_unit) ! verbose description of the prec
call read_data(prec%ptype,inp_unit) ! preconditioner type
! First smoother / 1-lev preconditioner
call read_data(prec%smther,inp_unit) ! smoother type
call read_data(prec%jsweeps,inp_unit) ! (pre-)smoother / 1-lev prec sweeps
call read_data(prec%novr,inp_unit) ! number of overlap layers
call read_data(prec%restr,inp_unit) ! restriction over application of AS
call read_data(prec%prol,inp_unit) ! prolongation over application of AS
call read_data(prec%solve,inp_unit) ! local subsolver
call read_data(prec%fill,inp_unit) ! fill-in for incomplete LU
call read_data(prec%thr,inp_unit) ! threshold for ILUT
! Second smoother/ AMG post-smoother (if NONE ignored in main)
call read_data(prec%smther2,inp_unit) ! smoother type
call read_data(prec%jsweeps2,inp_unit) ! (post-)smoother sweeps
call read_data(prec%novr2,inp_unit) ! number of overlap layers
call read_data(prec%restr2,inp_unit) ! restriction over application of AS
call read_data(prec%prol2,inp_unit) ! prolongation over application of AS
call read_data(prec%solve2,inp_unit) ! local subsolver
call read_data(prec%fill2,inp_unit) ! fill-in for incomplete LU
call read_data(prec%thr2,inp_unit) ! threshold for ILUT
! general AMG data
call read_data(prec%mlcycle,inp_unit) ! AMG cycle type
call read_data(prec%outer_sweeps,inp_unit) ! number of 1lev/outer sweeps
call read_data(prec%maxlevs,inp_unit) ! max number of levels in AMG prec
call read_data(prec%csize,inp_unit) ! min size coarsest mat
! aggregation
call read_data(prec%aggr_prol,inp_unit) ! aggregation type
call read_data(prec%par_aggr_alg,inp_unit) ! parallel aggregation alg
call read_data(prec%aggr_ord,inp_unit) ! ordering for aggregation
call read_data(prec%aggr_filter,inp_unit) ! filtering
call read_data(prec%mncrratio,inp_unit) ! minimum aggregation ratio
call read_data(prec%thrvsz,inp_unit) ! size of aggr thresh vector
if (prec%thrvsz > 0) then
call psb_realloc(prec%thrvsz,prec%athresv,info)
call read_data(prec%athresv,inp_unit) ! aggr thresh vector
else
read(inp_unit,*) ! dummy read to skip a record
end if
call read_data(prec%athres,inp_unit) ! smoothed aggr thresh
! coasest-level solver
call read_data(prec%csolve,inp_unit) ! coarsest-lev solver
call read_data(prec%csbsolve,inp_unit) ! coarsest-lev subsolver
call read_data(prec%cmat,inp_unit) ! coarsest mat layout
call read_data(prec%cfill,inp_unit) ! fill-in for incompl LU
call read_data(prec%cthres,inp_unit) ! Threshold for ILUT
call read_data(prec%cjswp,inp_unit) ! sweeps for GS/JAC subsolver
if (inp_unit /= psb_inp_unit) then
close(inp_unit)
end if
end if
call psb_bcast(icontxt,afmt)
call psb_bcast(icontxt,idim)
call psb_bcast(icontxt,solve%kmethd)
call psb_bcast(icontxt,solve%istopc)
call psb_bcast(icontxt,solve%itmax)
call psb_bcast(icontxt,solve%itrace)
call psb_bcast(icontxt,solve%irst)
call psb_bcast(icontxt,solve%eps)
call psb_bcast(icontxt,prec%descr)
call psb_bcast(icontxt,prec%ptype)
! broadcast first (pre-)smoother / 1-lev prec data
call psb_bcast(icontxt,prec%smther)
call psb_bcast(icontxt,prec%jsweeps)
call psb_bcast(icontxt,prec%novr)
call psb_bcast(icontxt,prec%restr)
call psb_bcast(icontxt,prec%prol)
call psb_bcast(icontxt,prec%solve)
call psb_bcast(icontxt,prec%fill)
call psb_bcast(icontxt,prec%thr)
! broadcast second (post-)smoother
call psb_bcast(icontxt,prec%smther2)
call psb_bcast(icontxt,prec%jsweeps2)
call psb_bcast(icontxt,prec%novr2)
call psb_bcast(icontxt,prec%restr2)
call psb_bcast(icontxt,prec%prol2)
call psb_bcast(icontxt,prec%solve2)
call psb_bcast(icontxt,prec%fill2)
call psb_bcast(icontxt,prec%thr2)
! broadcast AMG parameters
call psb_bcast(icontxt,prec%mlcycle)
call psb_bcast(icontxt,prec%outer_sweeps)
call psb_bcast(icontxt,prec%maxlevs)
call psb_bcast(icontxt,prec%aggr_prol)
call psb_bcast(icontxt,prec%par_aggr_alg)
call psb_bcast(icontxt,prec%aggr_ord)
call psb_bcast(icontxt,prec%aggr_filter)
call psb_bcast(icontxt,prec%mncrratio)
call psb_bcast(icontxt,prec%thrvsz)
if (prec%thrvsz > 0) then
if (iam /= psb_root_) call psb_realloc(prec%thrvsz,prec%athresv,info)
call psb_bcast(icontxt,prec%athresv)
end if
call psb_bcast(icontxt,prec%athres)
call psb_bcast(icontxt,prec%csize)
call psb_bcast(icontxt,prec%cmat)
call psb_bcast(icontxt,prec%csolve)
call psb_bcast(icontxt,prec%csbsolve)
call psb_bcast(icontxt,prec%cfill)
call psb_bcast(icontxt,prec%cthres)
call psb_bcast(icontxt,prec%cjswp)
end subroutine get_parms
end program mld_d_pde2d
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