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psblas3/base/comm/psb_dscatter_a.F90

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!
! 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_dscatter.f90
!
! Subroutine: psb_dscatterm
! This subroutine scatters a global matrix locally owned by one process
! into pieces that are local to all the processes.
!
! Arguments:
! globx - real,dimension(:,:). The global matrix to scatter.
! locx - real,dimension(:,:). The local piece of the distributed matrix.
! desc_a - type(psb_desc_type). The communication descriptor.
! info - integer. Error code.
! iroot - integer(optional). The process that owns the global matrix.
! If -1 all the processes have a copy.
! Default -1
subroutine psb_dscatterm(globx, locx, desc_a, info, root)
use psb_base_mod, psb_protect_name => psb_dscatterm
#ifdef MPI_MOD
use mpi
#endif
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
real(psb_dpk_), intent(out), allocatable :: locx(:,:)
real(psb_dpk_), intent(in) :: globx(:,:)
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_), intent(in), optional :: root
! locals
type(psb_ctxt_type) :: ictxt
integer(psb_mpk_) :: np, me, iroot, icomm, myrank, rootrank, iam, nlr
integer(psb_ipk_) :: ierr(5), err_act, nrow,&
& ilocx, jlocx, lda_locx, lda_globx, lock, globk, k, maxk, &
& col,pos
integer(psb_lpk_) :: m, n, i, j, idx, iglobx, jglobx
real(psb_dpk_),allocatable :: scatterv(:)
integer(psb_mpk_), allocatable :: displ(:), all_dim(:)
integer(psb_lpk_), allocatable :: l_t_g_all(:), ltg(:)
character(len=20) :: name, ch_err
name='psb_scatterm'
info=psb_success_
call psb_erractionsave(err_act)
if (psb_errstatus_fatal()) then
info = psb_err_internal_error_ ; goto 9999
end if
ictxt=desc_a%get_context()
! check on blacs grid
call psb_info(ictxt, iam, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (present(root)) then
iroot = root
if((iroot < -1).or.(iroot >= np)) then
info=psb_err_input_value_invalid_i_
ierr(1)=5; ierr(2)=iroot
call psb_errpush(info,name,i_err=ierr)
goto 9999
end if
else
iroot = psb_root_
end if
iglobx = 1
jglobx = 1
lda_globx = size(globx,1)
m = desc_a%get_global_rows()
n = desc_a%get_global_cols()
icomm = psb_get_mpi_comm(ictxt)
myrank = psb_get_mpi_rank(ictxt,me)
if (iroot==-1) then
lda_globx = size(globx, 1)
k = size(globx,2)
else
if (iam==iroot) then
k = size(globx,2)
lda_globx = size(globx, 1)
end if
end if
m = desc_a%get_global_rows()
n = desc_a%get_global_cols()
! there should be a global check on k here!!!
if ((iroot==-1).or.(iam==iroot)) &
& call psb_chkglobvect(m,n,lda_globx,iglobx,jglobx,desc_a,info)
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
nrow=desc_a%get_local_rows()
! root has to gather size information
allocate(displ(np),all_dim(np),ltg(nrow),stat=info)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='Allocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
do i=1, nrow
ltg(i) = i
end do
call psb_loc_to_glob(ltg(1:nrow),desc_a,info)
call psb_geall(locx,desc_a,info,n=k)
if ((iroot == -1).or.(np == 1)) then
! extract my chunk
do j=1,k
do i=1, nrow
locx(i,j)=globx(ltg(i),j)
end do
end do
else
rootrank = psb_get_mpi_rank(ictxt,iroot)
!
! This is potentially unsafe when IPK=8
! But then, IPK=8 is highly experimental anyway.
!
nlr = nrow
call mpi_gather(nlr,1,psb_mpi_mpk_,all_dim,&
& 1,psb_mpi_mpk_,rootrank,icomm,info)
if (iam == iroot) then
displ(1)=0
do i=2,np
displ(i)=displ(i-1)+all_dim(i-1)
end do
! root has to gather loc_glob from each process
allocate(l_t_g_all(sum(all_dim)),scatterv(sum(all_dim)),stat=info)
else
!
! This is to keep debugging compilers from being upset by
! calling an external MPI function with an unallocated array;
! the Fortran side would complain even if the MPI side does
! not use the unallocated stuff.
!
allocate(l_t_g_all(1),scatterv(1),stat=info)
end if
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='Allocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call mpi_gatherv(ltg,nlr,&
& psb_mpi_lpk_,l_t_g_all,all_dim,&
& displ,psb_mpi_lpk_,rootrank,icomm,info)
do col=1, k
! prepare vector to scatter
if(iam == iroot) then
do i=1,np
pos=displ(i)
do j=1, all_dim(i)
idx=l_t_g_all(pos+j)
scatterv(pos+j)=globx(idx,col)
end do
end do
end if
! scatter
call mpi_scatterv(scatterv,all_dim,displ,&
& psb_mpi_r_dpk_,locx(1,col),nrow,&
& psb_mpi_r_dpk_,rootrank,icomm,info)
end do
deallocate(l_t_g_all, scatterv,stat=info)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='deallocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
end if
deallocate(all_dim, displ, ltg,stat=info)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='deallocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end subroutine psb_dscatterm
!!$
!!$ Parallel Sparse BLAS version 3.5
!!$ (C) Copyright 2006-2018
!!$ Salvatore Filippone University of Rome Tor Vergata
!!$ 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.
!!$
!!$
! Subroutine: psb_dscatterv
! This subroutine scatters a global vector locally owned by one process
! into pieces that are local to all the processes.
!
! Arguments:
! globx - real,dimension(:). The global vector to scatter.
! locx - real,dimension(:). The local piece of the ditributed vector.
! desc_a - type(psb_desc_type). The communication descriptor.
! info - integer. Return code
! iroot - integer(optional). The process that owns the global vector. If -1 all
! the processes have a copy.
!
subroutine psb_dscatterv(globx, locx, desc_a, info, root)
use psb_base_mod, psb_protect_name => psb_dscatterv
#ifdef MPI_MOD
use mpi
#endif
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
real(psb_dpk_), intent(out), allocatable :: locx(:)
real(psb_dpk_), intent(in) :: globx(:)
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_), intent(in), optional :: root
! locals
type(psb_ctxt_type) :: ictxt
integer(psb_mpk_) :: np, iam, iroot, iiroot, icomm, myrank, rootrank, nlr
integer(psb_ipk_) :: ierr(5), err_act, nrow,&
& ilocx, jlocx, lda_locx, lda_globx, k, pos, ilx, jlx
integer(psb_lpk_) :: m, n, i, j, idx, iglobx, jglobx
real(psb_dpk_), allocatable :: scatterv(:)
integer(psb_mpk_), allocatable :: displ(:), all_dim(:)
integer(psb_lpk_), allocatable :: l_t_g_all(:), ltg(:)
character(len=20) :: name, ch_err
integer(psb_ipk_) :: debug_level, debug_unit
name='psb_scatterv'
info=psb_success_
call psb_erractionsave(err_act)
if (psb_errstatus_fatal()) then
info = psb_err_internal_error_ ; goto 9999
end if
ictxt=desc_a%get_context()
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
! check on blacs grid
call psb_info(ictxt, iam, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (present(root)) then
iroot = root
if((iroot < -1).or.(iroot > np)) then
info=psb_err_input_value_invalid_i_
ierr(1) = 5; ierr(2)=iroot
call psb_errpush(info,name,i_err=ierr)
goto 9999
end if
else
iroot = psb_root_
end if
icomm = psb_get_mpi_comm(ictxt)
myrank = psb_get_mpi_rank(ictxt,iam)
iglobx = 1
jglobx = 1
ilocx = 1
jlocx = 1
if ((iroot==-1).or.(iam==iroot))&
& lda_globx = size(globx, 1)
m = desc_a%get_global_rows()
n = desc_a%get_global_cols()
k = 1
! there should be a global check on k here!!!
if ((iroot==-1).or.(iam==iroot)) &
& call psb_chkglobvect(m,n,lda_globx,iglobx,jglobx,desc_a,info)
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
nrow = desc_a%get_local_rows()
allocate(displ(np),all_dim(np),ltg(nrow),stat=info)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='Allocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
do i=1, nrow
ltg(i) = i
end do
call psb_loc_to_glob(ltg(1:nrow),desc_a,info)
call psb_geall(locx,desc_a,info)
if ((iroot == -1).or.(np == 1)) then
! extract my chunk
do i=1, nrow
locx(i)=globx(ltg(i))
end do
else
rootrank = psb_get_mpi_rank(ictxt,iroot)
!
! This is potentially unsafe when IPK=8
! But then, IPK=8 is highly experimental anyway.
!
nlr = nrow
call mpi_gather(nlr,1,psb_mpi_mpk_,all_dim,&
& 1,psb_mpi_mpk_,rootrank,icomm,info)
if(iam == iroot) then
displ(1)=0
do i=2,np
displ(i)=displ(i-1) + all_dim(i-1)
end do
if (debug_level >= psb_debug_inner_) then
write(debug_unit,*) iam,' ',trim(name),' displ:',displ(1:np), &
&' dim',all_dim(1:np), sum(all_dim)
endif
! root has to gather loc_glob from each process
allocate(l_t_g_all(sum(all_dim)),scatterv(sum(all_dim)),stat=info)
else
!
! This is to keep debugging compilers from being upset by
! calling an external MPI function with an unallocated array;
! the Fortran side would complain even if the MPI side does
! not use the unallocated stuff.
!
allocate(l_t_g_all(1),scatterv(1),stat=info)
end if
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='Allocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call mpi_gatherv(ltg,nlr,&
& psb_mpi_lpk_,l_t_g_all,all_dim,&
& displ,psb_mpi_lpk_,rootrank,icomm,info)
! prepare vector to scatter
if (iam == iroot) then
do i=1,np
pos=displ(i)
do j=1, all_dim(i)
idx=l_t_g_all(pos+j)
scatterv(pos+j)=globx(idx)
end do
end do
end if
call mpi_scatterv(scatterv,all_dim,displ,&
& psb_mpi_r_dpk_,locx,nrow,&
& psb_mpi_r_dpk_,rootrank,icomm,info)
deallocate(l_t_g_all, scatterv,stat=info)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='deallocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
end if
deallocate(all_dim, displ, ltg,stat=info)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='deallocate'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end subroutine psb_dscatterv