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psblas3/base/comm/psb_dgather.f90

282 lines
8.3 KiB
Fortran

!
! Parallel Sparse BLAS version 3.5
! (C) Copyright 2006-2018
! Salvatore Filippone
! Alfredo Buttari
!
! 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 PSBLAS 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 PSBLAS 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: psb_dgather.f90
!
! Subroutine: psb_dgather_vect
! This subroutine gathers pieces of a distributed vector into a local one.
!
! Arguments:
! globx - real,dimension(:). The local matrix into which gather
! the distributed pieces.
! locx - type(psb_d_vect_type@ The local piece of the distributed
! vector to be gathered.
! desc_a - type(psb_desc_type). The communication descriptor.
! info - integer. Error code.
! iroot - integer. The process that has to own the
! global matrix. If -1 all
! the processes will have a copy.
!
subroutine psb_dgather_vect(globx, locx, desc_a, info, iroot)
use psb_base_mod, psb_protect_name => psb_dgather_vect
implicit none
type(psb_d_vect_type), intent(inout) :: locx
real(psb_dpk_), intent(out), allocatable :: globx(:)
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_), intent(in), optional :: iroot
! locals
type(psb_ctxt_type) :: ctxt
integer(psb_mpk_) :: np, me, root, iiroot, icomm, myrank, rootrank, loc_rows
integer(psb_ipk_) :: ierr(5), err_act, jlx, ilx, lda_locx, lda_globx, i
integer(psb_lpk_) :: m, n, k, ilocx, jlocx, idx, iglobx, jglobx
real(psb_dpk_), allocatable :: llocx(:)
integer(psb_mpk_), allocatable :: szs(:)
character(len=20) :: name, ch_err
name='psb_dgatherv'
info=psb_success_
call psb_erractionsave(err_act)
if (psb_errstatus_fatal()) then
info = psb_err_internal_error_ ; goto 9999
end if
ctxt=desc_a%get_context()
! check on blacs grid
call psb_info(ctxt, me, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (present(iroot)) then
root = iroot
if((root < -1).or.(root > np)) then
info=psb_err_input_value_invalid_i_
ierr(1)=5; ierr(2)=root;
call psb_errpush(info,name,i_err=ierr)
goto 9999
end if
else
root = -1
end if
jglobx=1
iglobx = 1
jlocx=1
ilocx = 1
m = desc_a%get_global_rows()
n = desc_a%get_global_cols()
lda_globx = m
lda_locx = locx%get_nrows()
k = 1
! there should be a global check on k here!!!
call psb_chkglobvect(m,n,lda_globx,iglobx,jglobx,desc_a,info)
if (info == psb_success_) &
& call psb_chkvect(m,n,locx%get_nrows(),ilocx,jlocx,desc_a,info,ilx,jlx)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_chk(glob)vect'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if ((ilx /= 1).or.(iglobx /= 1)) then
info=psb_err_ix_n1_iy_n1_unsupported_
call psb_errpush(info,name)
goto 9999
end if
llocx = locx%get_vect()
! adjust overlapped elements
do i=1, size(desc_a%ovrlap_elem,1)
if (me /= desc_a%ovrlap_elem(i,3)) then
idx = desc_a%ovrlap_elem(i,1)
llocx(idx) = dzero
end if
end do
allocate(szs(np))
loc_rows = desc_a%get_local_rows()
call psb_gather(ctxt,loc_rows,szs,root=root)
if ((me == root).or.(root == -1)) then
if (sum(szs) /= m) then
info=psb_err_internal_error_
call psb_errpush(info,name)
goto 9999
end if
call psb_realloc(m,globx,info)
if (info /= psb_success_) then
info=psb_err_alloc_dealloc_
call psb_errpush(info,name)
goto 9999
end if
end if
call psb_gatherv(ctxt,llocx(1:loc_rows),globx,szs,root=root)
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ctxt,err_act)
return
end subroutine psb_dgather_vect
! Subroutine: psb_dgather_multivect
! This subroutine gathers pieces of a distributed multivector into a local one.
subroutine psb_dgather_multivect(globx, locx, desc_a, info, iroot)
use psb_base_mod, psb_protect_name => psb_dgather_multivect
implicit none
type(psb_d_multivect_type), intent(inout) :: locx
real(psb_dpk_), intent(out), allocatable :: globx(:,:)
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_), intent(in), optional :: iroot
! locals
type(psb_ctxt_type) :: ctxt
integer(psb_mpk_) :: np, me, root, iiroot, icomm, myrank, rootrank
integer(psb_ipk_) :: ierr(5), err_act, jlx, ilx, lda_locx, lda_globx, i
integer(psb_lpk_) :: m, n, k, ilocx, jlocx, idx, iglobx, jglobx
real(psb_dpk_), allocatable :: llocx(:,:)
character(len=20) :: name, ch_err
name='psb_dgatherv'
info=psb_success_
call psb_erractionsave(err_act)
if (psb_errstatus_fatal()) then
info = psb_err_internal_error_ ; goto 9999
end if
ctxt=desc_a%get_context()
! check on blacs grid
call psb_info(ctxt, me, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (present(iroot)) then
root = iroot
if((root < -1).or.(root > np)) then
info=psb_err_input_value_invalid_i_
ierr(1)=5; ierr(2)=root;
call psb_errpush(info,name,i_err=ierr)
goto 9999
end if
else
root = -1
end if
jglobx=1
iglobx = 1
jlocx=1
ilocx = 1
m = desc_a%get_global_rows()
n = desc_a%get_global_cols()
lda_globx = m
lda_locx = locx%get_nrows()
k = locx%get_ncols()
! there should be a global check on k here!!!
call psb_chkglobvect(m,n,lda_globx,iglobx,jglobx,desc_a,info)
if (info == psb_success_) &
& call psb_chkvect(m,n,locx%get_nrows(),ilocx,jlocx,desc_a,info,ilx,jlx)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_chk(glob)vect'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if ((ilx /= 1).or.(iglobx /= 1)) then
info=psb_err_ix_n1_iy_n1_unsupported_
call psb_errpush(info,name)
goto 9999
end if
call psb_realloc(m,k,globx,info)
if (info /= psb_success_) then
info=psb_err_alloc_dealloc_
call psb_errpush(info,name)
goto 9999
end if
globx(:,:) = dzero
llocx = locx%get_vect()
do i=1,desc_a%get_local_rows()
call psb_loc_to_glob(i,idx,desc_a,info)
globx(idx,:) = llocx(i,:)
end do
! adjust overlapped elements
do i=1, size(desc_a%ovrlap_elem,1)
if (me /= desc_a%ovrlap_elem(i,3)) then
idx = desc_a%ovrlap_elem(i,1)
call psb_loc_to_glob(idx,desc_a,info)
globx(idx,:) = dzero
end if
end do
call psb_sum(ctxt,globx(1:m,1:k),root=root)
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ctxt,err_act)
return
end subroutine psb_dgather_multivect