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psblas3/base/comm/internals/psi_lswapdata.F90

764 lines
23 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_lswapdata.F90
!
!
!
! Subroutine: psi_lswapdata_vect
! Implements the data exchange among processes. Essentially this is doing
! a variable all-to-all data exchange (ALLTOALLV in MPI parlance), but
! it is capable of pruning empty exchanges, which are very likely in out
! application environment. All the variants have the same structure
! In all these subroutines X may be: I Integer
! S real(psb_spk_)
! D real(psb_dpk_)
! C complex(psb_spk_)
! Z complex(psb_dpk_)
! Basically the operation is as follows: on each process, we identify
! sections SND(Y) and RCV(Y); then we do a SEND(PACK(GTH(SND(Y))));
! then we receive, and we do an update with Y = SCT(RCV(Y)) + BETA * Y
! but only on the elements involved in the SCT operation.
! Thus: for halo data exchange, the receive section is confined in the
! halo indices, and BETA=0, whereas for overlap exchange the receive section
! is scattered in the owned indices, and BETA=1.
! The first routine picks the desired exchange index list and passes it to the second.
! This version works on encapsulated vectors, and uses their methods to do GTH and SCT,
! so that special versions (i.e. GPU vectors can override them
!
! Arguments:
! flag - integer Choose the algorithm for data exchange:
! this is chosen through bit fields.
! swap_mpi = iand(flag,psb_swap_mpi_) /= 0
! swap_sync = iand(flag,psb_swap_sync_) /= 0
! swap_send = iand(flag,psb_swap_send_) /= 0
! swap_recv = iand(flag,psb_swap_recv_) /= 0
! if (swap_mpi): use underlying MPI_ALLTOALLV.
! if (swap_sync): use PSB_SND and PSB_RCV in
! synchronized pairs
! if (swap_send .and. swap_recv): use mpi_irecv
! and mpi_send
! if (swap_send): use psb_snd (but need another
! call with swap_recv to complete)
! if (swap_recv): use psb_rcv (completing a
! previous call with swap_send)
!
!
! n - integer Number of columns in Y
! beta - integer Choose overwrite or sum.
! y - type(psb_@x@_vect_type) The data area
! desc_a - type(psb_desc_type). The communication descriptor.
! work(:) - integer Buffer space. If not sufficient, will do
! our own internal allocation.
! info - integer. return code.
! data - integer which list is to be used to exchange data
! default psb_comm_halo_
! psb_comm_halo_ use halo_index
! psb_comm_ext_ use ext_index
! psb_comm_ovrl_ use ovrl_index
! psb_comm_mov_ use ovr_mst_idx
!
!
!
subroutine psi_lswapdata_vect(flag,beta,y,desc_a,work,info,data)
use psi_mod, psb_protect_name => psi_lswapdata_vect
use psb_l_base_vect_mod
use psb_error_mod
use psb_desc_mod
use psb_penv_mod
#ifdef MPI_MOD
use mpi
#endif
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
integer(psb_ipk_), intent(in) :: flag
integer(psb_ipk_), intent(out) :: info
class(psb_l_base_vect_type) :: y
integer(psb_lpk_) :: beta
integer(psb_lpk_), target :: work(:)
type(psb_desc_type), target :: desc_a
integer(psb_ipk_), optional :: data
! locals
integer(psb_ipk_) :: ictxt, np, me, icomm, idxs, idxr, totxch, data_, err_act
class(psb_i_base_vect_type), pointer :: d_vidx
character(len=20) :: name
info=psb_success_
name='psi_swap_datav'
call psb_erractionsave(err_act)
ictxt = desc_a%get_context()
icomm = desc_a%get_mpic()
call psb_info(ictxt,me,np)
if (np == -1) then
info=psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (.not.psb_is_asb_desc(desc_a)) then
info=psb_err_invalid_cd_state_
call psb_errpush(info,name)
goto 9999
endif
if(present(data)) then
data_ = data
else
data_ = psb_comm_halo_
end if
call desc_a%get_list(data_,d_vidx,totxch,idxr,idxs,info)
if (info /= psb_success_) then
call psb_errpush(psb_err_internal_error_,name,a_err='psb_cd_get_list')
goto 9999
end if
call psi_swapdata(ictxt,icomm,flag,beta,y,d_vidx,totxch,idxs,idxr,work,info)
if (info /= psb_success_) goto 9999
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end subroutine psi_lswapdata_vect
!
!
! Subroutine: psi_lswap_vidx_vect
! Data exchange among processes.
!
! Takes care of Y an exanspulated vector. Relies on the gather/scatter methods
! of vectors.
!
! The real workhorse: the outer routine will only choose the index list
! this one takes the index list and does the actual exchange.
!
!
!
subroutine psi_lswap_vidx_vect(iictxt,iicomm,flag,beta,y,idx, &
& totxch,totsnd,totrcv,work,info)
use psi_mod, psb_protect_name => psi_lswap_vidx_vect
use psb_error_mod
use psb_realloc_mod
use psb_desc_mod
use psb_penv_mod
use psb_l_base_vect_mod
#ifdef MPI_MOD
use mpi
#endif
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
integer(psb_ipk_), intent(in) :: iictxt,iicomm,flag
integer(psb_ipk_), intent(out) :: info
class(psb_l_base_vect_type) :: y
integer(psb_lpk_) :: beta
integer(psb_lpk_), target :: work(:)
class(psb_i_base_vect_type), intent(inout) :: idx
integer(psb_ipk_), intent(in) :: totxch,totsnd, totrcv
! locals
integer(psb_mpk_) :: ictxt, icomm, np, me,&
& proc_to_comm, p2ptag, p2pstat(mpi_status_size), iret
integer(psb_mpk_), allocatable :: prcid(:)
integer(psb_ipk_) :: nesd, nerv,&
& err_act, i, idx_pt, totsnd_, totrcv_,&
& snd_pt, rcv_pt, pnti, n
logical :: swap_mpi, swap_sync, swap_send, swap_recv,&
& albf,do_send,do_recv
logical, parameter :: usersend=.false., debug=.false.
character(len=20) :: name
info=psb_success_
name='psi_swap_datav'
call psb_erractionsave(err_act)
ictxt = iictxt
icomm = iicomm
call psb_info(ictxt,me,np)
if (np == -1) then
info=psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
n=1
swap_mpi = iand(flag,psb_swap_mpi_) /= 0
swap_sync = iand(flag,psb_swap_sync_) /= 0
swap_send = iand(flag,psb_swap_send_) /= 0
swap_recv = iand(flag,psb_swap_recv_) /= 0
do_send = swap_mpi .or. swap_sync .or. swap_send
do_recv = swap_mpi .or. swap_sync .or. swap_recv
totrcv_ = totrcv * n
totsnd_ = totsnd * n
call idx%sync()
if (debug) write(*,*) me,'Internal buffer'
if (do_send) then
if (allocated(y%comid)) then
if (any(y%comid /= mpi_request_null)) then
!
! Unfinished communication? Something is wrong....
!
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/-2/))
goto 9999
end if
end if
if (debug) write(*,*) me,'do_send start'
call y%new_buffer(ione*size(idx%v),info)
call y%new_comid(totxch,info)
y%comid = mpi_request_null
call psb_realloc(totxch,prcid,info)
! First I post all the non blocking receives
pnti = 1
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
rcv_pt = 1+pnti+psb_n_elem_recv_
prcid(i) = psb_get_mpi_rank(ictxt,proc_to_comm)
if ((nerv>0).and.(proc_to_comm /= me)) then
if (debug) write(*,*) me,'Posting receive from',prcid(i),rcv_pt
p2ptag = psb_long_swap_tag
call mpi_irecv(y%combuf(rcv_pt),nerv,&
& psb_mpi_lpk_,prcid(i),&
& p2ptag, icomm,y%comid(i,2),iret)
end if
pnti = pnti + nerv + nesd + 3
end do
if (debug) write(*,*) me,' Gather '
!
! Then gather for sending.
!
pnti = 1
do i=1, totxch
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
snd_pt = 1+pnti+nerv+psb_n_elem_send_
rcv_pt = 1+pnti+psb_n_elem_recv_
idx_pt = snd_pt
call y%gth(idx_pt,nesd,idx)
pnti = pnti + nerv + nesd + 3
end do
!
! Then wait
!
call y%device_wait()
if (debug) write(*,*) me,' isend'
!
! Then send
!
pnti = 1
snd_pt = 1
rcv_pt = 1
p2ptag = psb_long_swap_tag
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
snd_pt = 1+pnti+nerv+psb_n_elem_send_
rcv_pt = 1+pnti+psb_n_elem_recv_
if ((nesd>0).and.(proc_to_comm /= me)) then
call mpi_isend(y%combuf(snd_pt),nesd,&
& psb_mpi_lpk_,prcid(i),&
& p2ptag,icomm,y%comid(i,1),iret)
end if
if(iret /= mpi_success) then
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/iret/))
goto 9999
end if
pnti = pnti + nerv + nesd + 3
end do
end if
if (do_recv) then
if (debug) write(*,*) me,' do_Recv'
if (.not.allocated(y%comid)) then
!
! No matching send? Something is wrong....
!
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/-2/))
goto 9999
end if
call psb_realloc(totxch,prcid,info)
if (debug) write(*,*) me,' wait'
pnti = 1
p2ptag = psb_long_swap_tag
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
snd_pt = 1+pnti+nerv+psb_n_elem_send_
rcv_pt = 1+pnti+psb_n_elem_recv_
if (proc_to_comm /= me)then
if (nesd>0) then
call mpi_wait(y%comid(i,1),p2pstat,iret)
if(iret /= mpi_success) then
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/iret/))
goto 9999
end if
end if
if (nerv>0) then
call mpi_wait(y%comid(i,2),p2pstat,iret)
if(iret /= mpi_success) then
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/iret/))
goto 9999
end if
end if
else if (proc_to_comm == me) then
if (nesd /= nerv) then
write(psb_err_unit,*) &
& 'Fatal error in swapdata: mismatch on self send',&
& nerv,nesd
end if
y%combuf(rcv_pt:rcv_pt+nerv-1) = y%combuf(snd_pt:snd_pt+nesd-1)
end if
pnti = pnti + nerv + nesd + 3
end do
if (debug) write(*,*) me,' scatter'
pnti = 1
snd_pt = 1
rcv_pt = 1
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
idx_pt = 1+pnti+psb_n_elem_recv_
snd_pt = 1+pnti+nerv+psb_n_elem_send_
rcv_pt = 1+pnti+psb_n_elem_recv_
if (debug) write(0,*)me,' Received from: ',prcid(i),&
& y%combuf(rcv_pt:rcv_pt+nerv-1)
call y%sct(rcv_pt,nerv,idx,beta)
pnti = pnti + nerv + nesd + 3
end do
!
! Waited for everybody, clean up
!
y%comid = mpi_request_null
!
! Then wait for device
!
if (debug) write(*,*) me,' wait'
call y%device_wait()
if (debug) write(*,*) me,' free buffer'
call y%maybe_free_buffer(info)
if (info == 0) call y%free_comid(info)
if (info /= 0) then
call psb_errpush(psb_err_alloc_dealloc_,name)
goto 9999
end if
if (debug) write(*,*) me,' done'
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(iictxt,err_act)
return
end subroutine psi_lswap_vidx_vect
!
!
! Subroutine: psi_lswapdata_multivect
! Data exchange among processes.
!
! Takes care of Y an encaspulated multivector.
!
!
subroutine psi_lswapdata_multivect(flag,beta,y,desc_a,work,info,data)
use psi_mod, psb_protect_name => psi_lswapdata_multivect
use psb_l_base_multivect_mod
use psb_error_mod
use psb_desc_mod
use psb_penv_mod
#ifdef MPI_MOD
use mpi
#endif
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
integer(psb_ipk_), intent(in) :: flag
integer(psb_ipk_), intent(out) :: info
class(psb_l_base_multivect_type) :: y
integer(psb_lpk_) :: beta
integer(psb_lpk_), target :: work(:)
type(psb_desc_type), target :: desc_a
integer(psb_ipk_), optional :: data
! locals
integer(psb_ipk_) :: ictxt, np, me, icomm, idxs, idxr, totxch, data_, err_act
class(psb_i_base_vect_type), pointer :: d_vidx
character(len=20) :: name
info=psb_success_
name='psi_swap_datav'
call psb_erractionsave(err_act)
ictxt = desc_a%get_context()
icomm = desc_a%get_mpic()
call psb_info(ictxt,me,np)
if (np == -1) then
info=psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (.not.psb_is_asb_desc(desc_a)) then
info=psb_err_invalid_cd_state_
call psb_errpush(info,name)
goto 9999
endif
if(present(data)) then
data_ = data
else
data_ = psb_comm_halo_
end if
call desc_a%get_list(data_,d_vidx,totxch,idxr,idxs,info)
if (info /= psb_success_) then
call psb_errpush(psb_err_internal_error_,name,a_err='psb_cd_get_list')
goto 9999
end if
call psi_swapdata(ictxt,icomm,flag,beta,y,d_vidx,totxch,idxs,idxr,work,info)
if (info /= psb_success_) goto 9999
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end subroutine psi_lswapdata_multivect
!
!
! Subroutine: psi_lswap_vidx_multivect
! Data exchange among processes.
!
! Takes care of Y an encapsulated multivector. Relies on the gather/scatter methods
! of multivectors.
!
! The real workhorse: the outer routine will only choose the index list
! this one takes the index list and does the actual exchange.
!
!
!
subroutine psi_lswap_vidx_multivect(iictxt,iicomm,flag,beta,y,idx, &
& totxch,totsnd,totrcv,work,info)
use psi_mod, psb_protect_name => psi_lswap_vidx_multivect
use psb_error_mod
use psb_realloc_mod
use psb_desc_mod
use psb_penv_mod
use psb_l_base_multivect_mod
#ifdef MPI_MOD
use mpi
#endif
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
integer(psb_ipk_), intent(in) :: iictxt,iicomm,flag
integer(psb_ipk_), intent(out) :: info
class(psb_l_base_multivect_type) :: y
integer(psb_lpk_) :: beta
integer(psb_lpk_), target :: work(:)
class(psb_i_base_vect_type), intent(inout) :: idx
integer(psb_ipk_), intent(in) :: totxch,totsnd, totrcv
! locals
integer(psb_mpk_) :: ictxt, icomm, np, me,&
& proc_to_comm, p2ptag, p2pstat(mpi_status_size), iret
integer(psb_mpk_), allocatable :: prcid(:)
integer(psb_ipk_) :: nesd, nerv,&
& err_act, i, idx_pt, totsnd_, totrcv_,&
& snd_pt, rcv_pt, pnti, n
logical :: swap_mpi, swap_sync, swap_send, swap_recv,&
& albf,do_send,do_recv
logical, parameter :: usersend=.false., debug=.false.
character(len=20) :: name
info=psb_success_
name='psi_swap_datav'
call psb_erractionsave(err_act)
ictxt = iictxt
icomm = iicomm
call psb_info(ictxt,me,np)
if (np == -1) then
info=psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
n = y%get_ncols()
swap_mpi = iand(flag,psb_swap_mpi_) /= 0
swap_sync = iand(flag,psb_swap_sync_) /= 0
swap_send = iand(flag,psb_swap_send_) /= 0
swap_recv = iand(flag,psb_swap_recv_) /= 0
do_send = swap_mpi .or. swap_sync .or. swap_send
do_recv = swap_mpi .or. swap_sync .or. swap_recv
totrcv_ = totrcv * n
totsnd_ = totsnd * n
call idx%sync()
if (debug) write(*,*) me,'Internal buffer'
if (do_send) then
if (allocated(y%comid)) then
if (any(y%comid /= mpi_request_null)) then
!
! Unfinished communication? Something is wrong....
!
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/-2/))
goto 9999
end if
end if
if (debug) write(*,*) me,'do_send start'
call y%new_buffer(ione*size(idx%v),info)
call y%new_comid(totxch,info)
y%comid = mpi_request_null
call psb_realloc(totxch,prcid,info)
! First I post all the non blocking receives
pnti = 1
snd_pt = totrcv_+1
rcv_pt = 1
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
prcid(i) = psb_get_mpi_rank(ictxt,proc_to_comm)
if ((nerv>0).and.(proc_to_comm /= me)) then
if (debug) write(*,*) me,'Posting receive from',prcid(i),rcv_pt
p2ptag = psb_long_swap_tag
call mpi_irecv(y%combuf(rcv_pt),n*nerv,&
& psb_mpi_lpk_,prcid(i),&
& p2ptag, icomm,y%comid(i,2),iret)
end if
rcv_pt = rcv_pt + n*nerv
snd_pt = snd_pt + n*nesd
pnti = pnti + nerv + nesd + 3
end do
if (debug) write(*,*) me,' Gather '
!
! Then gather for sending.
!
pnti = 1
snd_pt = totrcv_+1
rcv_pt = 1
do i=1, totxch
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
idx_pt = 1+pnti+nerv+psb_n_elem_send_
call y%gth(idx_pt,snd_pt,nesd,idx)
rcv_pt = rcv_pt + n*nerv
snd_pt = snd_pt + n*nesd
pnti = pnti + nerv + nesd + 3
end do
!
! Then wait for device
!
call y%device_wait()
if (debug) write(*,*) me,' isend'
!
! Then send
!
pnti = 1
snd_pt = totrcv_+1
rcv_pt = 1
p2ptag = psb_long_swap_tag
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
if ((nesd>0).and.(proc_to_comm /= me)) then
call mpi_isend(y%combuf(snd_pt),n*nesd,&
& psb_mpi_lpk_,prcid(i),&
& p2ptag,icomm,y%comid(i,1),iret)
end if
if(iret /= mpi_success) then
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/iret/))
goto 9999
end if
rcv_pt = rcv_pt + n*nerv
snd_pt = snd_pt + n*nesd
pnti = pnti + nerv + nesd + 3
end do
end if
if (do_recv) then
if (debug) write(*,*) me,' do_Recv'
if (.not.allocated(y%comid)) then
!
! No matching send? Something is wrong....
!
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/-2/))
goto 9999
end if
call psb_realloc(totxch,prcid,info)
if (debug) write(*,*) me,' wait'
pnti = 1
snd_pt = totrcv_+1
rcv_pt = 1
p2ptag = psb_long_swap_tag
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
if (proc_to_comm /= me)then
if (nesd>0) then
call mpi_wait(y%comid(i,1),p2pstat,iret)
if(iret /= mpi_success) then
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/iret/))
goto 9999
end if
end if
if (nerv>0) then
call mpi_wait(y%comid(i,2),p2pstat,iret)
if(iret /= mpi_success) then
info=psb_err_mpi_error_
call psb_errpush(info,name,m_err=(/iret/))
goto 9999
end if
end if
else if (proc_to_comm == me) then
if (nesd /= nerv) then
write(psb_err_unit,*) &
& 'Fatal error in swapdata: mismatch on self send',&
& nerv,nesd
end if
y%combuf(rcv_pt:rcv_pt+n*nerv-1) = y%combuf(snd_pt:snd_pt+n*nesd-1)
end if
rcv_pt = rcv_pt + n*nerv
snd_pt = snd_pt + n*nesd
pnti = pnti + nerv + nesd + 3
end do
if (debug) write(*,*) me,' scatter'
pnti = 1
snd_pt = totrcv_+1
rcv_pt = 1
do i=1, totxch
proc_to_comm = idx%v(pnti+psb_proc_id_)
nerv = idx%v(pnti+psb_n_elem_recv_)
nesd = idx%v(pnti+nerv+psb_n_elem_send_)
idx_pt = 1+pnti+psb_n_elem_recv_
if (debug) write(0,*)me,' Received from: ',prcid(i),&
& y%combuf(rcv_pt:rcv_pt+n*nerv-1)
call y%sct(idx_pt,rcv_pt,nerv,idx,beta)
rcv_pt = rcv_pt + n*nerv
snd_pt = snd_pt + n*nesd
pnti = pnti + nerv + nesd + 3
end do
!
! Waited for com, cleanup comid
!
y%comid = mpi_request_null
!
! Then wait for device
!
if (debug) write(*,*) me,' wait'
call y%device_wait()
if (debug) write(*,*) me,' free buffer'
call y%free_buffer(info)
if (info == 0) call y%free_comid(info)
if (info /= 0) then
call psb_errpush(psb_err_alloc_dealloc_,name)
goto 9999
end if
if (debug) write(*,*) me,' done'
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(iictxt,err_act)
return
end subroutine psi_lswap_vidx_multivect