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