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psblas3/base/internals/psi_crea_ovr_elem.f90

151 lines
4.6 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS version 3.0
!!$ (C) Copyright 2006, 2007, 2008, 2009, 2010
!!$ Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari CNRS-IRIT, Toulouse
!!$
!!$ 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
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!!$ 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: psi_crea_ovr_elem.f90
!
! Subroutine: psi_crea_ovr_elem
! Creates the overlap_elem list: for each overlap index, store the index and
! the number of processes sharing it (minimum: 2). List is ended by -1.
! See also description in base/modules/psb_desc_type.f90
!
! Arguments:
! ovr_elem(:,:) - integer, allocatable Array containing the output list
! desc_a - type(psb_desc_type). The communication descriptor.
! info - integer. return code.
!
subroutine psi_crea_ovr_elem(me,desc_overlap,ovr_elem,info)
use psi_mod, psb_protect_name => psi_crea_ovr_elem
use psb_realloc_mod
use psb_error_mod
use psb_penv_mod
use psb_serial_mod
implicit none
! ...parameter arrays....
integer, intent(in) :: me, desc_overlap(:)
integer, allocatable, intent(out) :: ovr_elem(:,:)
integer, intent(out) :: info
! ...local scalars...
integer :: i,pnt_new_elem,ret,j
integer :: dim_ovr_elem
integer :: pairtree(2)
! ...external function...
integer :: psi_exist_ovr_elem
external :: psi_exist_ovr_elem
integer :: nel, ip, ix, iel, insize, err_act, iproc
integer, allocatable :: telem(:,:)
character(len=20) :: name
info = psb_success_
name='psi_crea_ovr_elem'
if (allocated(ovr_elem)) then
dim_ovr_elem = size(ovr_elem,1)
else
dim_ovr_elem = 0
endif
insize = size(desc_overlap)
insize = max(1,(insize+1)/2)
allocate(telem(insize,3),stat=info)
if (info /= psb_success_) then
info = psb_err_alloc_dealloc_
call psb_errpush(info,name)
goto 9999
endif
i = 1
nel = 0
do while (desc_overlap(i) /= -1)
! ...loop over all procs of desc_overlap list....
iproc = desc_overlap(i)
i = i+1
do j=1,desc_overlap(i)
nel = nel + 1
telem(nel,1) = desc_overlap(i+j)
telem(nel,2) = 1
telem(nel,3) = iproc
enddo
i=i+2*desc_overlap(i)+2
enddo
if (nel > 0) then
call psb_msort(telem(1:nel,1),ix=telem(1:nel,3),flag=psb_sort_keep_idx_)
iel = telem(1,1)
telem(1,2) = 2
telem(1,3) = min(me,telem(1,3))
ix = 1
ip = 2
do
if (ip > nel) exit
if (telem(ip,1) == iel) then
telem(ix,2) = telem(ix,2) + 1
telem(ix,3) = min(telem(ix,3),telem(ip,3))
else
ix = ix + 1
telem(ix,1) = telem(ip,1)
iel = telem(ip,1)
telem(ix,2) = 2
telem(ix,3) = min(me,telem(ip,3))
end if
ip = ip + 1
end do
else
ix = 0
end if
nel = ix
call psb_realloc(nel,3,telem,info)
call psb_move_alloc(telem,ovr_elem,info)
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act == psb_act_abort_) then
call psb_error()
return
end if
return
end subroutine psi_crea_ovr_elem