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195 lines
6.3 KiB
Fortran
195 lines
6.3 KiB
Fortran
!!$
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!!$ Parallel Sparse BLAS v2.0
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!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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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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!
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! Purpose:
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! Provide a set of subroutines to define a data distribution based on
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! a graph partitioning routine from METIS. May serve as the basis
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! for interfacing other graph partitioning tools.
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!
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! Subroutines:
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!
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! BUILD_MTPART(A,NPARTS): This subroutine will be called by the root
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! process to build define the data distribuition mapping.
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! Input parameters:
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! TYPE(D_SPMAT) :: A The input matrix. The coefficients are
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! ignored; only the structure is used.
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! INTEGER :: NPARTS How many parts we are requiring to the
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! partition utility
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!
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! DISTR_MTPART(RROOT,CROOT,ICTXT): This subroutine will be called by
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! all processes to distribute the information computed by the root
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! process, to be used subsequently.
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!
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!
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! PART_GRAPH : The subroutine to be passed to PSBLAS sparse library;
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! uses information prepared by the previous two subroutines.
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!
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module psb_metispart_mod
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public part_graph, build_mtpart, distr_mtpart,&
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& getv_mtpart, free_part
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private
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integer, allocatable, save :: graph_vect(:)
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contains
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subroutine part_graph(global_indx,n,np,pv,nv)
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integer, intent(in) :: global_indx, n, np
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integer, intent(out) :: nv
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integer, intent(out) :: pv(*)
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IF (.not.allocated(graph_vect)) then
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write(0,*) 'Fatal error in PART_GRAPH: vector GRAPH_VECT ',&
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& 'not initialized'
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return
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endif
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if ((global_indx<1).or.(global_indx > size(graph_vect))) then
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write(0,*) 'Fatal error in PART_GRAPH: index GLOBAL_INDX ',&
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& 'outside GRAPH_VECT bounds',global_indx,size(graph_vect)
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return
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endif
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nv = 1
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pv(nv) = graph_vect(global_indx)
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return
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end subroutine part_graph
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subroutine distr_mtpart(root, ictxt)
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use psb_base_mod
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integer :: root, ictxt
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integer :: n, me, np
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call psb_info(ictxt,me,np)
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if (.not.((root>=0).and.(root<np))) then
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write(0,*) 'Fatal error in DISTR_MTPART: invalid ROOT ',&
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& 'coordinates '
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call psb_abort(ictxt)
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return
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endif
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if (me == root) then
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if (.not.allocated(graph_vect)) then
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write(0,*) 'Fatal error in DISTR_MTPART: vector GRAPH_VECT ',&
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& 'not initialized'
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call psb_abort(ictxt)
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return
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endif
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n = size(graph_vect)
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call psb_bcast(ictxt,n,root=root)
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else
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call psb_bcast(ictxt,n,root=root)
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allocate(graph_vect(n),stat=info)
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if (info /= 0) then
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write(0,*) 'Fatal error in DISTR_MTPART: memory allocation ',&
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& ' failure.'
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return
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endif
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endif
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call psb_bcast(ictxt,graph_vect(1:n),root=root)
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return
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end subroutine distr_mtpart
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subroutine getv_mtpart(ivg)
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integer, allocatable, intent(out) :: ivg(:)
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if (allocated(graph_vect)) then
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allocate(ivg(size(graph_vect)))
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ivg(:) = graph_vect(:)
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end if
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end subroutine getv_mtpart
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subroutine build_mtpart(n,fida,ia1,ia2,nparts)
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use psb_base_mod
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integer :: nparts
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integer :: ia1(:), ia2(:)
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integer :: n, i, ib, ii,numflag,nedc,wgflag
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character(len=5) :: fida
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integer, parameter :: nb=512
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real(kind(1.d0)), parameter :: seed=12345.d0
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real(kind(1.d0)) :: XV(NB)
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integer :: iopt(10),idummy(2),jdummy(2)
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interface
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subroutine METIS_PartGraphRecursive(n,ixadj,iadj,ivwg,iajw,&
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& wgflag,numflag,nparts,iopt,nedc,part)
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integer :: n,wgflag,numflag,nparts,nedc
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integer :: ixadj(*),iadj(*),ivwg(*),iajw(*),iopt(*),part(*)
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end subroutine METIS_PartGraphRecursive
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end interface
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allocate(graph_vect(n),stat=info)
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if (info /= 0) then
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write(0,*) 'Fatal error in BUILD_MTPART: memory allocation ',&
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& ' failure.'
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return
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endif
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if (nparts.gt.1) then
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if (toupper(fida).eq.'CSR') then
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iopt(1) = 0
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numflag = 1
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wgflag = 0
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call METIS_PartGraphRecursive(n,ia2,ia1,idummy,jdummy,&
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& wgflag,numflag,nparts,iopt,nedc,graph_vect)
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do i=1, n
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graph_vect(i) = graph_vect(i) - 1
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enddo
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else
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write(0,*) 'Fatal error in BUILD_MTPART: matrix format ',&
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& ' failure. ', FIDA
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return
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endif
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else
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do i=1, n
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graph_vect(i) = 0
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enddo
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endif
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return
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end subroutine build_mtpart
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subroutine free_part(info)
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integer :: info
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deallocate(graph_vect,stat=info)
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return
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end subroutine free_part
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end module psb_metispart_mod
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