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psblas3/base/internals/psi_crea_index.f90

159 lines
6.3 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: psi_crea_index.f90
!
! Subroutine: psb_crea_index
! Converts a list of data exchanges from build format to assembled format.
! See psi_desc_index for a description of the formats.
! Works by first finding a suitable ordering for the data exchanges,
! then doing the actual conversion.
!
! Arguments:
! desc_a - type(psb_desc_type) The descriptor; in this context only the index
! mapping parts are used.
! index_in(:) - integer The index list, build format
! index_out(:) - integer(psb_ipk_), allocatable The index list, assembled format
! glob_idx - logical Whether the input indices are in local or global
! numbering; the global numbering is used when
! converting the overlap exchange lists.
! nxch - integer The number of data exchanges on the calling process
! nsnd - integer Total send buffer size on the calling process
! nrcv - integer Total receive buffer size on the calling process
!
!
subroutine psi_crea_index(desc_a,index_in,index_out,glob_idx,nxch,nsnd,nrcv,info)
use psb_realloc_mod
use psb_desc_mod
use psb_error_mod
use psb_penv_mod
use psi_mod, psb_protect_name => psi_crea_index
implicit none
type(psb_desc_type), intent(in) :: desc_a
integer(psb_ipk_), intent(out) :: info,nxch,nsnd,nrcv
integer(psb_ipk_), intent(in) :: index_in(:)
integer(psb_ipk_), allocatable, intent(inout) :: index_out(:)
logical :: glob_idx
! ....local scalars...
integer(psb_ipk_) :: ictxt, me, np, mode, err_act, dl_lda
! ...parameters...
integer(psb_ipk_), allocatable :: dep_list(:,:), length_dl(:)
integer(psb_ipk_),parameter :: root=psb_root_,no_comm=-1
integer(psb_ipk_) :: debug_level, debug_unit
character(len=20) :: name
info = psb_success_
name='psi_crea_index'
call psb_erractionsave(err_act)
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
ictxt = desc_a%get_ctxt()
call psb_info(ictxt,me,np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
! allocate dependency list
! This should be computed more efficiently to save space when
! the number of processors becomes very high
dl_lda=np+1
allocate(dep_list(max(1,dl_lda),0:np),length_dl(0:np),stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
goto 9999
end if
! ...extract dependence list (ordered list of identifer process
! which every process must communcate with...
if (debug_level >= psb_debug_inner_) &
& write(debug_unit,*) me,' ',trim(name),': calling extract_dep_list'
mode = 1
call psi_extract_dep_list(ictxt,&
& desc_a%is_bld(), desc_a%is_upd(),&
& index_in, dep_list,length_dl,np,max(1,dl_lda),mode,info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='extrct_dl')
goto 9999
end if
if (debug_level >= psb_debug_inner_) &
& write(debug_unit,*) me,' ',trim(name),': from extract_dep_list',&
& me,length_dl(0),index_in(1), ':',dep_list(:length_dl(me),me)
! ...now process root contains dependence list of all processes...
if (debug_level >= psb_debug_inner_) &
& write(debug_unit,*) me,' ',trim(name),': root sorting dep list'
call psi_dl_check(dep_list,max(1,dl_lda),np,length_dl)
! ....now i can sort dependency lists.
call psi_sort_dl(dep_list,length_dl,np,info)
if(info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='psi_sort_dl')
goto 9999
end if
if(debug_level >= psb_debug_inner_)&
& write(debug_unit,*) me,' ',trim(name),': calling psi_desc_index'
! Do the actual format conversion.
call psi_desc_index(desc_a,index_in,dep_list(1:,me),&
& length_dl(me),nsnd,nrcv, index_out,glob_idx,info)
if(debug_level >= psb_debug_inner_) &
& write(debug_unit,*) me,' ',trim(name),': out of psi_desc_index',&
& size(index_out)
nxch = length_dl(me)
if(info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='psi_desc_index')
goto 9999
end if
deallocate(dep_list,length_dl)
if(debug_level >= psb_debug_inner_) &
& write(debug_unit,*) me,' ',trim(name),': done'
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end subroutine psi_crea_index