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psblas3/base/tools/psb_cddec.f90

281 lines
8.8 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS v2.0
!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$
!!$ 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_cddec(nloc, ictxt, desc_a, info)
20 years ago
! Purpose
! =======
!
! Allocate special descriptor for decoupled index space
!
!
!
! INPUT
!======
! NLOC : (Local Input) Integer
! Number of local indices
! required.
!
! ictxt : (Global Input)Integer BLACS context for an NPx1 grid
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! required.
!
! OUTPUT
!=========
! desc_a : TYPEDESC
! desc_a OUTPUT FIELDS:
!
! MATRIX_DATA : Pointer to integer Array
! contains some
! local and global information about matrix:
!
! NOTATION STORED IN EXPLANATION
! ------------ ---------------------- -------------------------------------
! DEC_TYPE MATRIX_DATA[DEC_TYPE_] Decomposition type, temporarly is
! setted to 1( matrix not yet assembled)
! M MATRIX_DATA[M_] Total number of equations
! N MATRIX_DATA[N_] Total number of variables
! N_ROW MATRIX_DATA[N_ROW_] Number of local equations
! N_COL MATRIX_DATA[N_COL_] Number of local columns (see below)
! CTXT_A MATRIX_DATA[CTXT_] The BLACS context handle,
! indicating
! the global context of the operation
! on the matrix.
! The context itself is global.
!
! GLOB_TO_LOC Array of dimension equal to number of global
! rows/cols (MATRIX_DATA[M_]). On exit,
! for all global indices either:
! 1. The index belongs to the current process; the entry
! is set to the next free local row index.
! 2. The index belongs to process P (0<=P<=NP-1); the entry
! is set to
! -(NP+P+1)
!
! LOC_TO_GLOB An array of dimension equal to number of local cols N_COL
! i.e. all columns of the matrix such that there is at least
! one nonzero entry within the local row range. At the time
! this routine is called N_COL cannot be know, so we set
! N_COL=N_ROW, and dimension this vector on N_ROW plus an
! estimate. On exit the vector elements are set
! to the index of the corresponding entry in GLOB_TO_LOC, or
! to -1 for indices I>N_ROW.
!
!
! HALO_INDEX Not touched here, as it depends on the matrix pattern
!
! OVRLAP_INDEX On exit from this routine, the overlap indices are stored in
! triples (Proc, 1, Index), similar to the assembled format
! but neither optimized, nor deadlock free.
! List is terminated with -1
!
! OVRLAP_ELEM On exit from this routine, just a list of pairs (index,#p).
! List is terminated with -1.
!
!
! END OF desc_a OUTPUT FIELDS
!
!
use psb_descriptor_type
use psb_serial_mod
use psb_const_mod
use psb_error_mod
use psi_mod
use psb_penv_mod
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implicit None
!....Parameters...
Integer, intent(in) :: nloc,ictxt
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integer, intent(out) :: info
Type(psb_desc_type), intent(out) :: desc_a
!locals
Integer :: i,j,np,me,err,n,itmpov, k,&
& l_ov_ix,l_ov_el,idx, err_act,m, ip,glx
Integer :: INT_ERR(5), thalo(1), tovr(1)
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integer, allocatable :: nlv(:)
logical, parameter :: debug=.false.
character(len=20) :: name
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if(psb_get_errstatus() /= 0) return
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info=0
err=0
name = 'psb_cddec'
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call psb_info(ictxt, me, np)
if (debug) write(*,*) 'psb_cdalll: ',np,me
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n = nloc
!... check nloc and n parameters....
if (nloc < 1) then
info = 10
int_err(1) = 1
int_err(2) = nloc
else if (n < 1) then
info = 10
int_err(1) = 2
int_err(2) = n
endif
if (info /= 0) then
call psb_errpush(info,name,i_err=int_err)
goto 9999
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end if
if (debug) write(*,*) 'psb_cdall: doing global checks'
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!global check on m and n parameters
allocate(nlv(0:np-1))
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nlv(:) = 0
nlv(me) = nloc
call psb_sum(ictxt,nlv(1:np))
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m = sum(nlv)
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call psb_nullify_desc(desc_a)
!count local rows number
if ( m >psb_cd_get_large_threshold()) then
allocate(desc_a%loc_to_glob(nloc), desc_a%lprm(1),&
& desc_a%ptree(2),desc_a%matrix_data(psb_mdata_size_),stat=info)
if (info == 0) call InitPairSearchTree(desc_a%ptree,info)
if (info /= 0) then
info=2025
int_err(1)=nloc
call psb_errpush(info,name,i_err=int_err)
goto 9999
end if
! set LOC_TO_GLOB array to all "-1" values
desc_a%lprm(1) = 0
desc_a%loc_to_glob(:) = -1
desc_a%matrix_data(psb_n_row_) = nloc
desc_a%matrix_data(psb_n_col_) = nloc
desc_a%matrix_data(psb_m_) = m
desc_a%matrix_data(psb_n_) = m
desc_a%matrix_data(psb_dec_type_) = psb_desc_large_bld_
desc_a%matrix_data(psb_ctxt_) = ictxt
call psb_get_mpicomm(ictxt,desc_a%matrix_data(psb_mpi_c_))
do ip=0, np-1
if (ip==me) then
do i=1, nlv(ip)
call SearchInsKeyVal(desc_a%ptree,j,i,glx,info)
desc_a%loc_to_glob(i) = j
j = j + 1
enddo
else
do i=1, nlv(ip)
j = j + 1
enddo
endif
enddo
tovr = -1
thalo = -1
desc_a%lprm(:) = 0
call psi_cnv_dsc(thalo,tovr,desc_a,info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='psi_bld_cdesc')
goto 9999
end if
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desc_a%matrix_data(psb_dec_type_) = psb_desc_large_asb_
else
allocate(desc_a%glob_to_loc(m),desc_a%matrix_data(psb_mdata_size_),&
& desc_a%loc_to_glob(m),desc_a%lprm(1),stat=info)
if (info /= 0) then
info=2025
int_err(1)=m
call psb_errpush(info,name,i_err=int_err)
goto 9999
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endif
desc_a%matrix_data(psb_n_row_) = nloc
desc_a%matrix_data(psb_n_col_) = nloc
desc_a%matrix_data(psb_m_) = m
desc_a%matrix_data(psb_n_) = m
desc_a%matrix_data(psb_dec_type_) = psb_desc_bld_
desc_a%matrix_data(psb_ctxt_) = ictxt
call psb_get_mpicomm(ictxt,desc_a%matrix_data(psb_mpi_c_))
j = 1
do ip=0, np-1
if (ip==me) then
do i=1, nlv(ip)
desc_a%glob_to_loc(j) = i
desc_a%loc_to_glob(i) = j
j = j + 1
enddo
else
do i=1, nlv(ip)
desc_a%glob_to_loc(j) = -(np+ip+1)
j = j + 1
enddo
endif
enddo
tovr = -1
thalo = -1
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desc_a%lprm(:) = 0
desc_a%matrix_data(psb_ovl_state_) = psb_cd_ovl_bld_
call psi_cnv_dsc(thalo,tovr,desc_a,info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='psi_bld_cdesc')
goto 9999
end if
desc_a%matrix_data(psb_dec_type_) = psb_desc_asb_
endif
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call psb_erractionrestore(err_act)
return
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9999 continue
call psb_erractionrestore(err_act)
if (err_act == act_abort) then
call psb_error(ictxt)
return
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end if
return
end subroutine psb_cddec