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utility.F90
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subroutine gather_matrix(na, a, lda, na_cols, nblk, my_prow, my_pcol, np_rows, np_cols, op_comm, ctxt, a_global)
implicit none
include 'mpif.h'
integer, intent(in) :: na, lda, na_cols, nblk, my_prow, my_pcol, np_rows, np_cols, op_comm, ctxt
real*8, intent(in) :: a(lda, na_cols)
real*8, intent(out) :: a_global(na,na)
integer i, j, lr, lc, myid, mpierr
integer steps, starti, endi
integer, allocatable :: l_row(:), l_col(:)
#if defined(PRINT_GATHER_DEBUG)
character*16 :: filename
#endif
! allocate and set index arrays
allocate(l_row(na))
allocate(l_col(na))
! Mapping of global rows/cols to local
l_row(:) = 0
l_col(:) = 0
lr = 0 ! local row counter
lc = 0 ! local column counter
call mpi_comm_rank(op_comm,myid,mpierr)
do i = 1, na
if( MOD((i-1)/nblk,np_rows) == my_prow) then
! row i is on local processor
lr = lr+1
l_row(i) = lr
#if defined(PRINT_GATHER_DEBUG2)
write(*,*) myid,' has row ',i,' on ',lr
#endif
endif
if( MOD((i-1)/nblk,np_cols) == my_pcol) then
! column i is on local processor
lc = lc+1
l_col(i) = lc
#if defined(PRINT_GATHER_DEBUG2)
write(*,*) myid,' has col ',i,' on ',lc
#endif
endif
enddo
a_global = 0
do i=1,na
if(l_col(i) > 0) then
do j=1,i
if(l_row(j)>0) a_global(j,i) = a(l_row(j),l_col(i))
enddo
endif
if(l_row(i) > 0) then
do j=1,i-1
if(l_col(j)>0) a_global(i,j) = a(l_row(i),l_col(j))
enddo
endif
enddo
#if defined(PRINT_GATHER_DEBUG)
write(filename,"(A6,I3.3,A4)") "gather",myid,".txt"
open(12,file=filename,status="unknown")
write(12,"(34E26.13E2)") (a_global(i,:),i=1,34)
close(12)
#endif
#if 0
! global reduction that stitches together the a_global
! Doesn't work for large enough matrices (na >> 15k on edison) because of
! limitations on BLACS buffer space
call DGSUM2D(ctxt,'A',' ',na,na,a_global,na,-1,-1,-1)
#elif 1
steps = 8
do i=1,steps
starti = (i-1)*(na/steps)+1
endi = i*(na/steps)
if(myid==0) write(*,*) i,starti,endi
call DGSUM2D(ctxt,'A',' ',na,endi-starti+1,a_global(:,starti:endi),na,-1,-1,-1)
enddo
if (.not. (endi == na)) then
starti=endi+1
endi=na
if(myid==0) write(*,*) i,starti,endi
call DGSUM2D(ctxt,'A',' ',na,endi-starti+1,a_global(:,starti:endi),na,-1,-1,-1)
endif
#endif
#if defined(PRINT_GATHER_DEBUG)
write(filename,"(A6,I3.3,A4)") "collect",myid,".txt"
open(12,file=filename,status="unknown")
write(12,"(34E26.13E2)") (a_global(i,:),i=1,PRINT_GATHER_DEBUG_N)
close(12)
#endif
deallocate(l_row, l_col)
end subroutine gather_matrix
!----------------------------------------------------------------------------------
subroutine section_matrix(na, a, lda, nblk, my_prow, my_pcol, np_rows, np_cols, op_comm, a_global)
implicit none
include 'mpif.h'
integer, intent(in) :: na, lda, nblk, my_prow, my_pcol, np_rows, np_cols, op_comm
real*8, intent(out) :: a(lda, *)
real*8, intent(in) :: a_global(na,na)
integer i, j, lr, lc, myid, mpierr
integer, allocatable :: l_row(:), l_col(:)
real*8, allocatable :: col(:)
#if defined(PRINT_SECTION_DEBUG)
character*16 :: filename
#endif
! allocate and set index arrays
allocate(l_row(na))
allocate(l_col(na))
! Mapping of global rows/cols to local
l_row(:) = 0
l_col(:) = 0
lr = 0 ! local row counter
lc = 0 ! local column counter
do i = 1, na
if( MOD((i-1)/nblk,np_rows) == my_prow) then
! row i is on local processor
lr = lr+1
l_row(i) = lr
endif
if( MOD((i-1)/nblk,np_cols) == my_pcol) then
! column i is on local processor
lc = lc+1
l_col(i) = lc
endif
enddo
call mpi_comm_rank(op_comm,myid,mpierr)
allocate(col(na))
do i=1,na
col(1:i) = a_global(1:i,i)
if(l_col(i) > 0) then
do j=1,i
if(l_row(j)>0) a(l_row(j),l_col(i)) = col(j)
enddo
endif
if(l_row(i) > 0) then
do j=1,i-1
if(l_col(j)>0) a(l_row(i),l_col(j)) = col(j)
enddo
endif
enddo
#if defined(PRINT_SECTION_DEBUG)
write(filename,"(A6,I3.3,A4)") "sectio",myid,".txt"
open(12,file=filename,status="unknown")
write(12,"(34E26.13E2)") (a_global(i,:),i=1,34)
close(12)
#endif
deallocate(l_row, l_col, col)
end subroutine section_matrix
!----------------------------------------------------------------------------------
subroutine bcast_matrix(na, a, lda, nblk, my_prow, my_pcol, np_rows, np_cols, op_comm, a_global)
implicit none
include 'mpif.h'
integer, intent(in) :: na, lda, nblk, my_prow, my_pcol, np_rows, np_cols, op_comm
real*8, intent(out) :: a(lda, *)
real*8, intent(in) :: a_global(na,na)
integer i, j, lr, lc, myid, mpierr
integer, allocatable :: l_row(:), l_col(:)
real*8, allocatable :: col(:)
character*16 :: filename
! allocate and set index arrays
allocate(l_row(na))
allocate(l_col(na))
! Mapping of global rows/cols to local
l_row(:) = 0
l_col(:) = 0
lr = 0 ! local row counter
lc = 0 ! local column counter
do i = 1, na
if( MOD((i-1)/nblk,np_rows) == my_prow) then
! row i is on local processor
lr = lr+1
l_row(i) = lr
endif
if( MOD((i-1)/nblk,np_cols) == my_pcol) then
! column i is on local processor
lc = lc+1
l_col(i) = lc
endif
enddo
call mpi_comm_rank(op_comm,myid,mpierr)
allocate(col(na))
do i=1,na
if(myid==0) col(1:i) = a_global(1:i,i)
call mpi_bcast(col,i,MPI_REAL8,0,op_comm,mpierr)
if(l_col(i) > 0) then
do j=1,i
if(l_row(j)>0) a(l_row(j),l_col(i)) = col(j)
enddo
endif
if(l_row(i) > 0) then
do j=1,i-1
if(l_col(j)>0) a(l_row(i),l_col(j)) = col(j)
enddo
endif
enddo
deallocate(l_row, l_col, col)
end subroutine bcast_matrix
!-------------------------------------------------------------------------------
subroutine read_matrix(iunit, na, a, lda, nblk, my_prow, my_pcol, np_rows, np_cols)
implicit none
include 'mpif.h'
integer, intent(in) :: iunit, na, lda, nblk, my_prow, my_pcol, np_rows, np_cols
real*8, intent(out) :: a(lda, *)
integer i, j, lr, lc, myid, mpierr
integer, allocatable :: l_row(:), l_col(:)
real*8, allocatable :: col(:)
! allocate and set index arrays
allocate(l_row(na))
allocate(l_col(na))
! Mapping of global rows/cols to local
l_row(:) = 0
l_col(:) = 0
lr = 0 ! local row counter
lc = 0 ! local column counter
do i = 1, na
if( MOD((i-1)/nblk,np_rows) == my_prow) then
! row i is on local processor
lr = lr+1
l_row(i) = lr
endif
if( MOD((i-1)/nblk,np_cols) == my_pcol) then
! column i is on local processor
lc = lc+1
l_col(i) = lc
endif
enddo
call mpi_comm_rank(mpi_comm_world,myid,mpierr)
allocate(col(na))
do i=1,na
if(myid==0) read(iunit,*) col(1:i)
call mpi_bcast(col,i,MPI_REAL8,0,MPI_COMM_WORLD,mpierr)
if(l_col(i) > 0) then
do j=1,i
if(l_row(j)>0) a(l_row(j),l_col(i)) = col(j)
enddo
endif
if(l_row(i) > 0) then
do j=1,i-1
if(l_col(j)>0) a(l_row(i),l_col(j)) = col(j)
enddo
endif
enddo
deallocate(l_row, l_col, col)
end subroutine read_matrix