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psblas3/base/internals/psi_compute_size.f90

135 lines
4.2 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.
!
!
!
! Compute maximum data exchange size; small utility for assembly of descriptors.
!
subroutine psi_compute_size(desc_data, index_in, dl_lda, info)
use psi_mod, psb_protect_name => psi_compute_size
use psb_const_mod
use psb_desc_mod
use psb_error_mod
use psb_penv_mod
implicit none
! ....scalars parameters....
integer(psb_ipk_) :: info, dl_lda
! .....array parameters....
integer(psb_ipk_) :: desc_data(:), index_in(:)
! ....local scalars....
integer(psb_ipk_) :: i,np,me,proc, max_index
integer(psb_ipk_) :: err_act
type(psb_ctxt_type) :: ictxt
! ...local array...
integer(psb_ipk_) :: int_err(5)
integer(psb_ipk_), allocatable :: counter_recv(:), counter_dl(:)
! ...parameters
integer(psb_ipk_) :: debug_level, debug_unit
character(len=20) :: name
name='psi_compute_size'
call psb_get_erraction(err_act)
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
info = psb_success_
ictxt = desc_data(psb_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(counter_dl(0:np-1),counter_recv(0:np-1),stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
goto 9999
end if
! ..initialize counters...
do i=0,np-1
counter_recv(i)=0
counter_dl(i)=0
enddo
! ....verify local correctness of halo_in....
i=1
do while (index_in(i) /= -1)
proc=index_in(i)
if ((proc > np-1).or.(proc < 0)) then
info = psb_err_invalid_pid_arg_
int_err(1) = 11
int_err(2) = proc
call psb_errpush(info,name,i_err=int_err)
goto 9999
endif
counter_dl(proc)=1
! ..update no of elements to receive from proc proc..
counter_recv(proc)=counter_recv(proc)+&
& index_in(i+1)
i=i+index_in(i+1)+2
enddo
! ...computing max_halo: max halo points to be received from
! same processor
max_index=0
dl_lda=0
do i=0,np-1
if (counter_recv(i) > max_index) max_index = counter_recv(i)
if (counter_dl(i) == 1) dl_lda = dl_lda+1
enddo
! computing max global value of dl_lda
call psb_amx(ictxt, dl_lda)
if (debug_level>=psb_debug_inner_) then
write(debug_unit,*) me,' ',trim(name),': ',dl_lda
endif
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end subroutine psi_compute_size