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112 lines
5.0 KiB
Fortran
112 lines
5.0 KiB
Fortran
!!$
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!!$ Parallel Sparse BLAS version 3.4
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!!$ (C) Copyright 2006, 2010, 2015
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari CNRS-IRIT, Toulouse
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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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module psb_s_mat_dist_mod
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use psb_base_mod, only : psb_ipk_, psb_spk_, psb_desc_type, psb_parts, &
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& psb_sspmat_type, psb_s_base_sparse_mat, psb_s_vect_type
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interface psb_matdist
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subroutine psb_smatdist(a_glob, a, ictxt, desc_a,&
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& info, b_glob, b, x_glob, x, parts, v, inroot,fmt,mold)
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!
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! an utility subroutine to distribute a matrix among processors
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! according to a user defined data distribution, using
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! sparse matrix subroutines.
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!
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! type(psb_sspmat) :: a_glob
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! on entry: this contains the global sparse matrix as follows:
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!
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! type(psb_sspmat_type) :: a
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! on exit : this will contain the local sparse matrix.
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!
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! interface parts
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! ! .....user passed subroutine.....
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! subroutine parts(global_indx,n,np,pv,nv)
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! implicit none
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! integer(psb_ipk_), intent(in) :: global_indx, n, np
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! integer(psb_ipk_), intent(out) :: nv
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! integer(psb_ipk_), intent(out) :: pv(*)
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!
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! end subroutine parts
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! end interface
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! on entry: subroutine providing user defined data distribution.
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! for each global_indx the subroutine should return
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! the list pv of all processes owning the row with
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! that index; the list will contain nv entries.
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! usually nv=1; if nv >1 then we have an overlap in the data
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! distribution.
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!
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! integer(psb_ipk_) :: ictxt
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! on entry: the PSBLAS parallel environment context.
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!
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! type (desc_type) :: desc_a
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! on exit : the updated array descriptor
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!
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! real(psb_spk_), optional :: b_glob(:)
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! on entry: RHS
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!
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! type(psb_s_vect_type), optional :: b
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! on exit : this will contain the local right hand side.
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!
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! real(psb_spk_), optional :: x_glob(:)
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! on entry: initial guess
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!
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! type(psb_s_vect_type), optional :: x
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! on exit : this will contain the local right hand side.
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!
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! integer(psb_ipk_), optional :: inroot
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! on entry: specifies processor holding a_glob. default: 0
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! on exit : unchanged.
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!
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import :: psb_ipk_, psb_sspmat_type, psb_spk_, psb_desc_type,&
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& psb_s_base_sparse_mat, psb_s_vect_type, psb_parts
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implicit none
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! parameters
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type(psb_sspmat_type) :: a_glob
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integer(psb_ipk_) :: ictxt
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type(psb_sspmat_type) :: a
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type(psb_desc_type) :: desc_a
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integer(psb_ipk_), intent(out) :: info
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real(psb_spk_), optional :: b_glob(:)
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type(psb_s_vect_type), optional :: b
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real(psb_spk_), optional :: x_glob(:)
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type(psb_s_vect_type), optional :: x
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integer(psb_ipk_), optional :: inroot
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character(len=*), optional :: fmt
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class(psb_s_base_sparse_mat), optional :: mold
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procedure(psb_parts), optional :: parts
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integer(psb_ipk_), optional :: v(:)
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end subroutine psb_smatdist
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end interface
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end module psb_s_mat_dist_mod
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