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assemble_MPI_vector.f90
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assemble_MPI_vector.f90
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!=====================================================================
!
! S p e c f e m 3 D V e r s i o n 1 . 4
! ---------------------------------------
!
! Dimitri Komatitsch and Jeroen Tromp
! Seismological Laboratory - California Institute of Technology
! (c) California Institute of Technology September 2006
!
! This program is free software; you can redistribute it and/or modify
! it under the terms of the GNU General Public License as published by
! the Free Software Foundation; either version 2 of the License, or
! (at your option) any later version.
!
! This program is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License along
! with this program; if not, write to the Free Software Foundation, Inc.,
! 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
!
!=====================================================================
!----
!---- assemble the contributions between slices and chunks using MPI
!----
subroutine assemble_MPI_vector(array_val,iproc_xi,iproc_eta,addressing, &
iboolleft_xi,iboolright_xi,iboolleft_eta,iboolright_eta, &
buffer_send_faces_vector,buffer_received_faces_vector,npoin2D_xi,npoin2D_eta, &
NPROC_XI,NPROC_ETA,NPOIN2DMAX_XMIN_XMAX,NPOIN2DMAX_YMIN_YMAX,NPOIN2DMAX_XY)
implicit none
include "constants.h"
! include values created by the mesher
include "OUTPUT_FILES/values_from_mesher.h"
! array to assemble
real(kind=CUSTOM_REAL), dimension(NDIM,NGLOB_AB_VAL) :: array_val
integer iproc_xi,iproc_eta
integer npoin2D_xi,npoin2D_eta
integer NPOIN2DMAX_XMIN_XMAX,NPOIN2DMAX_YMIN_YMAX,NPOIN2DMAX_XY
integer NPROC_XI,NPROC_ETA
! for addressing of the slices
integer, dimension(0:NPROC_XI-1,0:NPROC_ETA-1) :: addressing
! 2-D addressing and buffers for summation between slices
integer, dimension(NPOIN2DMAX_XMIN_XMAX) :: iboolleft_xi,iboolright_xi
integer, dimension(NPOIN2DMAX_YMIN_YMAX) :: iboolleft_eta,iboolright_eta
real(kind=CUSTOM_REAL), dimension(NDIM,NPOIN2DMAX_XY) :: buffer_send_faces_vector,buffer_received_faces_vector
integer ipoin
integer sender,receiver
integer, external :: proc_null
! $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
! here we have to assemble all the contributions between slices using MPI
!----
!---- first assemble along xi using the 2-D topology
!----
! assemble along xi only if more than one slice
if(NPROC_XI > 1) then
! slices copy the right face into the buffer
do ipoin=1,npoin2D_xi
buffer_send_faces_vector(:,ipoin) = array_val(:,iboolright_xi(ipoin))
enddo
! send messages forward along each row
if(iproc_xi == 0) then
sender = proc_null()
else
sender = addressing(iproc_xi - 1,iproc_eta)
endif
if(iproc_xi == NPROC_XI-1) then
receiver = proc_null()
else
receiver = addressing(iproc_xi + 1,iproc_eta)
endif
call sendrecv_all_cr(buffer_send_faces_vector,NDIM*npoin2D_xi,receiver,itag2, &
buffer_received_faces_vector,NDIM*npoin2D_xi,sender,itag)
! all slices add the buffer received to the contributions on the left face
if(iproc_xi > 0) then
do ipoin=1,npoin2D_xi
array_val(:,iboolleft_xi(ipoin)) = array_val(:,iboolleft_xi(ipoin)) + &
buffer_received_faces_vector(:,ipoin)
enddo
endif
! the contributions are correctly assembled on the left side of each slice
! now we have to send the result back to the sender
! all slices copy the left face into the buffer
do ipoin=1,npoin2D_xi
buffer_send_faces_vector(:,ipoin) = array_val(:,iboolleft_xi(ipoin))
enddo
! send messages backward along each row
if(iproc_xi == NPROC_XI-1) then
sender = proc_null()
else
sender = addressing(iproc_xi + 1,iproc_eta)
endif
if(iproc_xi == 0) then
receiver = proc_null()
else
receiver = addressing(iproc_xi - 1,iproc_eta)
endif
call sendrecv_all_cr(buffer_send_faces_vector,NDIM*npoin2D_xi,receiver,itag2, &
buffer_received_faces_vector,NDIM*npoin2D_xi,sender,itag)
! all slices copy the buffer received to the contributions on the right face
if(iproc_xi < NPROC_XI-1) then
do ipoin=1,npoin2D_xi
array_val(:,iboolright_xi(ipoin)) = buffer_received_faces_vector(:,ipoin)
enddo
endif
endif
!----
!---- then assemble along eta using the 2-D topology
!----
! assemble along eta only if more than one slice
if(NPROC_ETA > 1) then
! slices copy the right face into the buffer
do ipoin=1,npoin2D_eta
buffer_send_faces_vector(:,ipoin) = array_val(:,iboolright_eta(ipoin))
enddo
! send messages forward along each row
if(iproc_eta == 0) then
sender = proc_null()
else
sender = addressing(iproc_xi,iproc_eta - 1)
endif
if(iproc_eta == NPROC_ETA-1) then
receiver = proc_null()
else
receiver = addressing(iproc_xi,iproc_eta + 1)
endif
call sendrecv_all_cr(buffer_send_faces_vector,NDIM*npoin2D_eta,receiver,itag2, &
buffer_received_faces_vector,NDIM*npoin2D_eta,sender,itag)
! all slices add the buffer received to the contributions on the left face
if(iproc_eta > 0) then
do ipoin=1,npoin2D_eta
array_val(:,iboolleft_eta(ipoin)) = array_val(:,iboolleft_eta(ipoin)) + &
buffer_received_faces_vector(:,ipoin)
enddo
endif
! the contributions are correctly assembled on the left side of each slice
! now we have to send the result back to the sender
! all slices copy the left face into the buffer
do ipoin=1,npoin2D_eta
buffer_send_faces_vector(:,ipoin) = array_val(:,iboolleft_eta(ipoin))
enddo
! send messages backward along each row
if(iproc_eta == NPROC_ETA-1) then
sender = proc_null()
else
sender = addressing(iproc_xi,iproc_eta + 1)
endif
if(iproc_eta == 0) then
receiver = proc_null()
else
receiver = addressing(iproc_xi,iproc_eta - 1)
endif
call sendrecv_all_cr(buffer_send_faces_vector,NDIM*npoin2D_eta,receiver,itag2, &
buffer_received_faces_vector,NDIM*npoin2D_eta,sender,itag)
! all slices copy the buffer received to the contributions on the right face
if(iproc_eta < NPROC_ETA-1) then
do ipoin=1,npoin2D_eta
array_val(:,iboolright_eta(ipoin)) = buffer_received_faces_vector(:,ipoin)
enddo
endif
endif
end subroutine assemble_MPI_vector