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psblas3/base/tools/psb_cd_remap.F90

143 lines
4.8 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.
!
!
!
! Subroutine: psb_cdcpy
! Produces a clone of a descriptor.
!
! Arguments:
! desc_in - type(psb_desc_type). The communication descriptor to be cloned.
! desc_out - type(psb_desc_type). The output communication descriptor.
! info - integer. Return code.
subroutine psb_cd_remap(np_remap, desc_in, desc_out, info)
use psb_base_mod, psb_protect_name => psb_cd_remap
implicit none
!....parameters...
integer(psb_ipk_), intent(in) :: np_remap
type(psb_desc_type), intent(inout) :: desc_in
type(psb_desc_type), intent(out) :: desc_out
integer(psb_ipk_), intent(out) :: info
!locals
type(psb_ctxt_type) :: ctxt, newctxt
integer(psb_ipk_) :: np, me, err_act
integer(psb_ipk_) :: rnp, rme
integer(psb_ipk_) :: ipdest, id1, id2, imd, i
integer(psb_ipk_), allocatable :: newnl(:)
integer(psb_ipk_) :: debug_level, debug_unit
character(len=20) :: name
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
if (psb_get_errstatus() /= 0) return
info = psb_success_
call psb_erractionsave(err_act)
name = 'psb_cdcpy'
ctxt = desc_in%get_context()
! check on blacs grid
call psb_info(ctxt, me, np)
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': Entered'
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
write(0,*) ' Remapping from ',np,' onto ', np_remap
if (desc_in%get_fmt() == 'BLOCK') then
! OK
call psb_init(newctxt,np=np_remap,basectxt=ctxt)
call psb_info(newctxt,rme,rnp)
write(0,*) 'Old context: ',me,np,' New context: ',rme,rnp
call psb_bcast(ctxt,rnp)
allocate(newnl(rnp),stat=info)
if (info /= 0) then
info = psb_err_alloc_dealloc_
call psb_errpush(info,name)
goto 9999
endif
if (rnp >= np) then
write(0,*) ' No remapping on larger proc count now'
info = psb_err_internal_error_
call psb_errpush(info,name)
goto 9999
end if
id2 = np/rnp
id1 = id2+1
imd = mod(np,rnp)
if (me < (imd*id1)) then
ipdest = (me/id1)
else
ipdest = ( ((me-imd*id1)/id2) + imd)
end if
write(0,*) ' Sending my data from ',me,' to ', &
& ipdest, 'out of ',rnp,rnp-1
newnl = 0
newnl(ipdest+1) = desc_in%get_local_rows()
call psb_sum(ctxt,newnl)
if (rme>=0) then
call psb_cdall(newctxt,desc_out,info,nl=newnl(rme+1))
call psb_cdasb(desc_out,info)
write(0,*) me,rme,'In ',desc_in%get_local_rows(),desc_in%get_global_rows(),&
& ' out ',desc_out%get_local_rows(),desc_out%get_global_rows()
else
write(0,*) me,rme,'In ',desc_in%get_local_rows(),desc_in%get_global_rows(),&
& ' out ',0,0
end if
call psb_exit(newctxt,close=.false.)
else
write(0,*) 'Right now only BLOCK on input '
info = psb_err_invalid_cd_state_
call psb_errpush(info,name)
goto 9999
endif
!call psb_cdall()
! For the time being cleanup
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ctxt,err_act)
return
end subroutine psb_cd_remap