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sumfln_stochy.f
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!>@brief The module 'sumfln_stochy_mod' contains the subroutine sumfln_stochy
module sumfln_stochy_mod
implicit none
contains
!>@brief The subrountine 'sumfln_stochy' converts the spherical harmonics to fourier coefficients
!>@details This code is taken from the legacy spectral GFS
subroutine sumfln_stochy(flnev,flnod,lat1s,plnev,plnod,
& nvars,ls_node,latl2,
& workdim,nvarsdim,four_gr,
& ls_nodes,max_ls_nodes,
& lats_nodes,global_lats,
& lats_node,ipt_lats_node,
& lons_lat,londi,latl,nvars_0)
!
use stochy_resol_def , only : jcap,latgd
use spectral_layout_mod, only : len_trie_ls,len_trio_ls,
& ls_dim,ls_max_node,me,nodes
use kinddef
use spectral_layout_mod, only : num_parthds_stochy => ompthreads
use mpi_wrapper, only : mp_alltoall
implicit none
!
external esmf_dgemm
!
integer lat1s(0:jcap),latl2
!
integer nvars,nvars_0
real(kind=kind_dbl_prec) flnev(len_trie_ls,2*nvars)
real(kind=kind_dbl_prec) flnod(len_trio_ls,2*nvars)
!
real(kind=kind_dbl_prec) plnev(len_trie_ls,latl2)
real(kind=kind_dbl_prec) plnod(len_trio_ls,latl2)
!
integer ls_node(ls_dim,3)
!
!cmr ls_node(1,1) ... ls_node(ls_max_node,1) : values of L
!cmr ls_node(1,2) ... ls_node(ls_max_node,2) : values of jbasev
!cmr ls_node(1,3) ... ls_node(ls_max_node,3) : values of jbasod
!
! local scalars
! -------------
!
integer j, k, l, lat, lat1, n, kn, n2,indev,indod
!
! local arrays
! ------------
!
real(kind=kind_dbl_prec), dimension(nvars*2,latl2) :: apev, apod
integer num_threads, nvar_thread_max, nvar_1, nvar_2
&, thread
! xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
!
integer nvarsdim, latl, workdim, londi
&, lats_node, ipt_lats_node
!
real(kind=kind_dbl_prec) four_gr(londi,nvarsdim,workdim)
!
integer ls_nodes(ls_dim,nodes)
integer, dimension(nodes) :: max_ls_nodes, lats_nodes
integer, dimension(latl) :: global_lats, lons_lat
!jfe integer global_lats(latg+2*jintmx+2*nypt*(nodes-1))
!
real(kind=4),target,dimension(2,nvars,ls_dim*workdim,nodes)::
& workr,works
! real(kind=4),dimension(2*nvars*ls_dim*workdim*nodes)::
! & work1dr,work1ds
real(kind=4),pointer:: work1dr(:),work1ds(:)
integer, dimension(nodes) :: kpts, kptr, sendcounts, recvcounts,
& sdispls
!
integer ierr,ilat,ipt_ls, lmax,lval,i,jj,lonl,nv
integer node,nvar,arrsz,my_pe
integer ilat_list(nodes) ! for OMP buffer copy
!
! statement functions
! -------------------
!
integer indlsev, jbasev, indlsod, jbasod
!
include 'function_indlsev'
include 'function_indlsod'
!
real(kind=kind_dbl_prec), parameter :: cons0=0.0d0, cons1=1.0d0
!
! xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
!
arrsz=2*nvars*ls_dim*workdim*nodes
num_threads = min(num_parthds_stochy,nvars)
nvar_thread_max = (nvars+num_threads-1)/num_threads
kpts = 0
! write(0,*)' londi=',londi,'nvarsdim=',nvarsdim,'workdim=',workdim
!
do j = 1, ls_max_node ! start of do j loop #####################
!
l = ls_node(j,1)
jbasev = ls_node(j,2)
jbasod = ls_node(j,3)
indev = indlsev(l,l)
indod = indlsod(l+1,l)
!
lat1 = lat1s(l)
if ( kind_dbl_prec == 8 ) then !------------------------------------
!$omp parallel do num_threads(num_threads)
!$omp+private(thread,nvar_1,nvar_2,n2)
do thread=1,num_threads ! start of thread loop ..............
nvar_1 = (thread-1)*nvar_thread_max + 1
nvar_2 = min(nvar_1+nvar_thread_max-1,nvars)
if (nvar_2 >= nvar_1) then
n2 = 2*(nvar_2-nvar_1+1)
! compute the even and odd components of the fourier coefficients
!
! compute the sum of the even real terms for each level
! compute the sum of the even imaginary terms for each level
!
! call dgemm('t','n',latl2-lat1+1, 2*(nvar_2-nvar_1+1),
! & (jcap+2-l)/2,cons1, !constant
! & plnev(indev,lat1), len_trio_ls,
! & flnev(indev,2*nvar_1-1),len_trio_ls,cons0,
! & apev(2*nvar_1-1,lat1),latl2)
call esmf_dgemm(
& 't',
& 'n',
& n2,
& latl2-lat1+1,
& (jcap+3-l)/2,
& cons1,
& flnev(indev,2*nvar_1-1),
& len_trie_ls,
& plnev(indev,lat1),
& len_trie_ls,
& cons0,
& apev(2*nvar_1-1,lat1),
& 2*nvars
& )
!
! compute the sum of the odd real terms for each level
! compute the sum of the odd imaginary terms for each level
!
! call dgemm('t','n',latl2-lat1+1, 2*(nvar_2-nvar_1+1),
! & (jcap+2-l)/2,cons1, !constant
! & plnod(indod,lat1), len_trio_ls,
! & flnod(indod,2*nvar_1-1),len_trio_ls,cons0,
! & apod(2*nvar_1-1,lat1), latl2)
call esmf_dgemm(
& 't',
& 'n',
& n2,
& latl2-lat1+1,
& (jcap+2-l)/2,
& cons1,
& flnod(indod,2*nvar_1-1),
& len_trio_ls,
& plnod(indod,lat1),
& len_trio_ls,
& cons0,
& apod(2*nvar_1-1,lat1),
& 2*nvars
& )
!
endif
enddo ! end of thread loop ..................................
else !------------------------------------------------------------
!$omp parallel do num_threads(num_threads)
!$omp+private(thread,nvar_1,nvar_2)
do thread=1,num_threads ! start of thread loop ..............
nvar_1 = (thread-1)*nvar_thread_max + 1
nvar_2 = min(nvar_1+nvar_thread_max-1,nvars)
enddo ! end of thread loop ..................................
endif !-----------------------------------------------------------
!
ccxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
!
! compute the fourier coefficients for each level
! -----------------------------------------------
!
ilat_list(1) = 0
do node = 1, nodes - 1
ilat_list(node+1) = ilat_list(node) + lats_nodes(node)
end do
!$omp parallel do num_threads(num_threads)
!$omp+private(node,jj,ilat,lat,ipt_ls,nvar,kn,n2)
do node=1,nodes
do jj=1,lats_nodes(node)
ilat = ilat_list(node) + jj
lat = global_lats(ilat)
ipt_ls = min(lat,latl-lat+1)
if ( ipt_ls >= lat1s(ls_nodes(j,me+1)) ) then
kpts(node) = kpts(node) + 1
kn = kpts(node)
!
if ( lat <= latl2 ) then
! northern hemisphere
do nvar=1,nvars
n2 = nvar + nvar
works(1,nvar,kn,node) = apev(n2-1,ipt_ls)
& + apod(n2-1,ipt_ls)
works(2,nvar,kn,node) = apev(n2, ipt_ls)
& + apod(n2, ipt_ls)
enddo
else
! southern hemisphere
do nvar=1,nvars
n2 = nvar + nvar
works(1,nvar,kn,node) = apev(n2-1,ipt_ls)
& - apod(n2-1,ipt_ls)
works(2,nvar,kn,node) = apev(n2, ipt_ls)
& - apod(n2, ipt_ls)
enddo
endif
endif
enddo
enddo
!
enddo ! end of do j loop #######################################
!
kptr = 0
do node=1,nodes
do l=1,max_ls_nodes(node)
lval = ls_nodes(l,node)+1
do j=1,lats_node
lat = global_lats(ipt_lats_node-1+j)
if ( min(lat,latl-lat+1) >= lat1s(lval-1) ) then
kptr(node) = kptr(node) + 1
endif
enddo
enddo
enddo
!
!
n2 = nvars + nvars
!$omp parallel do num_threads(num_threads) private(node)
do node=1,nodes
sendcounts(node) = kpts(node) * n2
recvcounts(node) = kptr(node) * n2
sdispls(node) = (node-1) * n2 * ls_dim * workdim
end do
work1dr(1:arrsz)=>workr
work1ds(1:arrsz)=>works
call mp_alltoall(work1ds,sendcounts,sdispls,
& work1dr,recvcounts,sdispls)
nullify(work1dr)
nullify(work1ds)
!$omp parallel do num_threads(num_threads)
!$omp+private(j,lat,lmax,nvar,lval,n2,lonl,nv)
do j=1,lats_node
lat = global_lats(ipt_lats_node-1+j)
lonl = lons_lat(lat)
lmax = min(jcap,lonl/2)
n2 = lmax + lmax + 3
! write(0,*)' j=',j,' lat=',lat,' lmax=',lmax,' n2=',n2
! &,' nvars=',nvars,' lonl=',lonl
if ( n2 <= lonl+2 ) then
do nvar=1,nvars
nv = nvars_0 + nvar
do lval = n2, lonl+2
! write(0,*)' lval=',lval,' nvar=',nvar,nvars_0
! &,' n2=',n2,' lonl=',lonl,' nv=',nv,' j=',j
! &,'size=',size(four_gr,1),size(four_gr,2),size(four_gr,3)
four_gr(lval,nv,j) = cons0
enddo
enddo
endif
enddo
!
kptr = 0
! write(0,*)' kptr=',kptr(1)
!!
!$omp parallel do num_threads(num_threads)
!$omp+private(node,l,lval,j,lat,nvar,kn,n2)
do node=1,nodes
do l=1,max_ls_nodes(node)
lval = ls_nodes(l,node)+1
n2 = lval + lval
do j=1,lats_node
lat = global_lats(ipt_lats_node-1+j)
if ( min(lat,latl-lat+1) >= lat1s(lval-1) ) then
kptr(node) = kptr(node) + 1
kn = kptr(node)
do nvar=1,nvars
four_gr(n2-1,nvars_0+nvar,j) = workr(1,nvar,kn,node)
four_gr(n2, nvars_0+nvar,j) = workr(2,nvar,kn,node)
enddo
endif
enddo
enddo
enddo
!
return
end subroutine sumfln_stochy
end module sumfln_stochy_mod