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222 lines
8.0 KiB
Fortran
222 lines
8.0 KiB
Fortran
!
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! Parallel Sparse BLAS version 3.5
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! (C) Copyright 2006-2018
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! Salvatore Filippone
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! Alfredo Buttari
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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!
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!
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! File: psi_i_crea_index.f90
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!
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! Subroutine: psb_crea_index
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! Converts a list of data exchanges from build format to assembled format.
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! See psi_desc_index for a description of the formats.
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! Works by first finding a suitable ordering for the data exchanges,
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! then doing the actual conversion.
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!
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! Arguments:
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! desc_a - type(psb_desc_type) The descriptor; in this context only the index
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! mapping parts are used.
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! index_in(:) - integer The index list, build format
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! index_out(:) - integer(psb_ipk_), allocatable The index list, assembled format
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! nxch - integer The number of data exchanges on the calling process
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! nsnd - integer Total send buffer size on the calling process
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! nrcv - integer Total receive buffer size on the calling process
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!
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!
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subroutine psi_i_crea_index(desc_a,index_in,index_out,nxch,nsnd,nrcv,info)
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use psb_realloc_mod
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use psb_desc_mod
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use psb_error_mod
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use psb_penv_mod
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use psb_timers_mod
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use psi_mod, psb_protect_name => psi_i_crea_index
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implicit none
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type(psb_desc_type), intent(in) :: desc_a
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integer(psb_ipk_), intent(out) :: info,nxch,nsnd,nrcv
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integer(psb_ipk_), intent(in) :: index_in(:)
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integer(psb_ipk_), allocatable, intent(inout) :: index_out(:)
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! ....local scalars...
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type(psb_ctxt_type) :: ctxt
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integer(psb_ipk_) :: me, np, mode, err_act, dl_lda, ldl
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! ...parameters...
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integer(psb_ipk_), allocatable :: length_dl(:), loc_dl(:),&
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& c_dep_list(:), dl_ptr(:)
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integer(psb_ipk_) :: dlmax, dlavg
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integer(psb_ipk_),parameter :: root=psb_root_,no_comm=-1
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integer(psb_ipk_) :: debug_level, debug_unit
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character(len=20) :: name
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logical, parameter :: do_timings=.false., shuffle_dep_list=.false.
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integer(psb_ipk_), save :: idx_phase1=-1, idx_phase2=-1, idx_phase3=-1
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integer(psb_ipk_), save :: idx_phase21=-1, idx_phase22=-1, idx_phase13=-1
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info = psb_success_
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name='psi_crea_index'
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call psb_erractionsave(err_act)
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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ctxt = desc_a%get_ctxt()
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call psb_info(ctxt,me,np)
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if (np == -1) then
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info = psb_err_context_error_
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call psb_errpush(info,name)
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goto 9999
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endif
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if ((do_timings).and.(idx_phase1==-1)) &
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& idx_phase1 = psb_get_timer_idx("PSI_CREA_INDEX: phase1 ")
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if ((do_timings).and.(idx_phase2==-1)) &
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& idx_phase2 = psb_get_timer_idx("PSI_CREA_INDEX: phase2")
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if ((do_timings).and.(idx_phase3==-1)) &
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& idx_phase3 = psb_get_timer_idx("PSI_CREA_INDEX: phase3")
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if ((do_timings).and.(idx_phase21==-1)) &
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& idx_phase21 = psb_get_timer_idx("PSI_CREA_INDEX: phase21 ")
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if ((do_timings).and.(idx_phase22==-1)) &
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& idx_phase22 = psb_get_timer_idx("PSI_CREA_INDEX: phase22")
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!!$ if ((do_timings).and.(idx_phase13==-1)) &
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!!$ & idx_phase13 = psb_get_timer_idx("PSI_CREA_INDEX: phase13")
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! ...extract dependence list (ordered list of identifer process
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! which every process must communcate with...
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if (debug_level >= psb_debug_inner_) &
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& write(debug_unit,*) me,' ',trim(name),': calling extract_loc_dl'
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mode = 1
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if (do_timings) call psb_tic(idx_phase1)
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call psi_extract_loc_dl(ctxt,&
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& desc_a%is_bld(), desc_a%is_upd(),&
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& index_in, loc_dl,length_dl,info)
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dlmax = maxval(length_dl(:))
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dlavg = (sum(length_dl(:))+np-1)/np
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if (do_timings) call psb_toc(idx_phase1)
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if (do_timings) call psb_tic(idx_phase2)
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if (choose_sorting(dlmax,dlavg,np)) then
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if (do_timings) call psb_tic(idx_phase21)
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call psi_bld_glb_dep_list(ctxt,&
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& loc_dl,length_dl,c_dep_list,dl_ptr,info)
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if (info /= 0) then
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write(0,*) me,trim(name),' From bld_glb_list ',info
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end if
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if (do_timings) call psb_toc(idx_phase21)
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if (do_timings) call psb_tic(idx_phase22)
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call psi_sort_dl(dl_ptr,c_dep_list,length_dl,ctxt,info)
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if (info /= 0) then
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write(0,*) me,trim(name),' From sort_dl ',info
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end if
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ldl = length_dl(me)
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loc_dl = c_dep_list(dl_ptr(me):dl_ptr(me)+ldl-1)
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if (do_timings) call psb_toc(idx_phase22)
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else
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! Do nothing
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ldl = length_dl(me)
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loc_dl = loc_dl(1:ldl)
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if (shuffle_dep_list) then
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!
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! Apply a random shuffle to the dependency list
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! should improve the behaviour
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!
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block
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! Algorithm 3.4.2P from TAOCP vol 2.
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integer(psb_ipk_) :: tmp
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integer :: j,k
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real :: u
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do j=ldl,2,-1
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call random_number(u)
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k = min(j,floor(j*u)+1)
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tmp = loc_dl(k)
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loc_dl(k) = loc_dl(j)
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loc_dl(j) = tmp
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end do
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end block
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end if
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end if
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if (do_timings) call psb_toc(idx_phase2)
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if (do_timings) call psb_tic(idx_phase3)
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if(debug_level >= psb_debug_inner_)&
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& write(debug_unit,*) me,' ',trim(name),': calling psi_desc_index',ldl,':',loc_dl(1:ldl)
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! Do the actual format conversion.
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if (dlmax == 0) then
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! There is a sufficiently large number of cases
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! where the initial exchange list is empty that
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! it's worthwhile to take a shortcut.
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call psb_realloc(ione,index_out,info)
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index_out(1) = -1
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else
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call psi_desc_index(desc_a,index_in,loc_dl,ldl,nsnd,nrcv,index_out,info)
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endif
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if(debug_level >= psb_debug_inner_) &
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& write(debug_unit,*) me,' ',trim(name),': out of psi_desc_index',&
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& size(index_out)
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nxch = ldl
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if(info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='psi_desc_index')
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goto 9999
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end if
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if (do_timings) call psb_toc(idx_phase3)
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if (allocated(length_dl)) deallocate(length_dl,stat=info)
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if (info /= 0) then
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info = psb_err_alloc_dealloc_
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goto 9999
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end if
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if(debug_level >= psb_debug_inner_) &
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& write(debug_unit,*) me,' ',trim(name),': done'
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(ctxt,err_act)
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return
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contains
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function choose_sorting(dlmax,dlavg,np) result(val)
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implicit none
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integer(psb_ipk_), intent(in) :: dlmax,dlavg,np
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logical :: val
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val = .not.(((dlmax>(26*4)).or.((dlavg>=(26*2)).and.(np>=128))))
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val = (dlmax<16)
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!val = .true.
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val = .false.
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end function choose_sorting
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end subroutine psi_i_crea_index
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