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mpi_interface.f95
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module mpi_interface
use grid
use mpi
integer :: ierr,total_sum,comm,myid,num_proc,comm2d,ndim,plane
real*8 :: rold,rnew,rnew_tot,rold_tot,alpha_tot,gam,gam_tot,rhs_sum,rhs_sum_tot
integer :: status(mpi_status_size)
integer, dimension(2) :: dims
logical, dimension(2) :: isperiodic,outperiods
integer, dimension(2) :: outdims,outcoords,coords
integer, dimension(3) :: starts,sizes,subsizes
logical :: reorder
integer :: left,right,front,back,topleft,topright,bottomleft,bottomright,local_disp,recvsubarray,resizedrecvsubarray
integer, dimension(:), allocatable :: counts,disps
real*8, dimension(:,:,:), allocatable :: p
real*8 :: c
integer(kind=mpi_address_kind) :: begin, extent
contains
subroutine mpi_begin
dims(1)=0
dims(2)=0
isperiodic(1)=.true.
isperiodic(2)=.true.
reorder=.true.
ndim=2
call mpi_init(ierr)
call mpi_comm_size(mpi_comm_world,num_proc,ierr)
call mpi_dims_create(num_proc,ndim,dims,ierr)
call mpi_cart_create(mpi_comm_world,ndim,dims,isperiodic,reorder,comm2d,ierr)
call mpi_cart_get(comm2d,ndim,outdims,outperiods,outcoords,ierr)
write(*,*) outdims
if(outcoords(2)==0)then
x_dim=N_x-(outdims(2)-1)*(N_x/outdims(2))
else
x_dim=N_x/outdims(2)
endif
if(outcoords(1)==0)then
y_dim=N_y-(outdims(1)-1)*(N_y/outdims(1))
else
y_dim=N_y/outdims(1)
endif
call mpi_comm_rank(comm2d,myid,ierr)
allocate(var(2*NGz+N_vert,2*NGx+x_dim,2*NGy+y_dim,7),g(2*NGz+N_vert,2*NGx+x_dim,2*NGy+y_dim),xt(x_dim),yt(y_dim),zt(N_vert),&
S(N_vert+2,x_dim+2,y_dim+2),f(N_vert,x_dim,y_dim,5))
allocate(p(2+N_vert,2+x_dim,2+y_dim))
end subroutine mpi_begin
subroutine neighbors
implicit none
call mpi_cart_shift(comm2d,0,1,back,front,ierr)
call mpi_cart_shift(comm2d,1,1,left,right,ierr)
end subroutine neighbors
subroutine var_exchange(var)
implicit none
real*8, dimension(N_vert+4,x_dim+4,y_dim+4,6) :: var
integer :: i
do i=1,6
call mpi_type_vector(x_dim,N_vert,2*NGz+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,3,y_dim+2,i),1,plane,front,0,&
var(3,3,2,i),1,plane,back,0,comm2d,status,ierr)
call mpi_type_vector(x_dim,N_vert,2*NGz+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,3,3,i),1,plane,back,1,&
var(3,3,NGy+y_dim+1,i),1,plane,front,1,comm2d,status,ierr)
call mpi_type_vector(x_dim,N_vert,2*NGz+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,3,y_dim+1,i),1,plane,front,2,&
var(3,3,1,i),1,plane,back,2,comm2d,status,ierr)
call mpi_type_vector(x_dim,N_vert,2*NGz+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,3,4,i),1,plane,back,3,&
var(3,3,2*NGy+y_dim,i),1,plane,front,3,comm2d,status,ierr)
enddo
do i=1,6
call mpi_type_vector(y_dim,N_vert,(x_dim+2*Ngx)*(2*NGz+N_vert),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,x_dim+2,3,i),1,plane,right,0,&
var(3,2,3,i),1,plane,left,0,comm2d,status,ierr)
call mpi_type_vector(y_dim,N_vert,(x_dim+2*Ngx)*(2*NGz+N_vert),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,3,3,i),1,plane,left,1,&
var(3,NGx+x_dim+1,3,i),1,plane,right,1,comm2d,status,ierr)
call mpi_type_vector(y_dim,N_vert,(x_dim+2*Ngx)*(2*NGz+N_vert),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,x_dim+1,3,i),1,plane,right,2,&
var(3,1,3,i),1,plane,left,2,comm2d,status,ierr)
call mpi_type_vector(y_dim,N_vert,(x_dim+2*Ngx)*(2*NGz+N_vert),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(var(3,4,3,i),1,plane,left,3,&
var(3,2*NGx+x_dim,3,i),1,plane,right,3,comm2d,status,ierr)
enddo
end subroutine var_exchange
subroutine conj_exchange(p,k)
implicit none
real*8, dimension(N_vert+2,x_dim+2,y_dim+2) :: p
integer :: k
call mpi_type_vector(x_dim,N_vert,2+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,2,1+y_dim),1,plane,front,0,&
p(2,2,1),1,plane,back,0,comm2d,status,ierr)
call mpi_type_vector(x_dim,N_vert,2+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,2,2),1,plane,back,1,&
p(2,2,y_dim+2),1,plane,front,1,comm2d,status,ierr)
call mpi_type_vector(y_dim,N_vert,(2+N_vert)*(2+x_dim),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,2,2),1,plane,left,2,&
p(2,x_dim+2,2),1,plane,right,2,comm2d,status,ierr)
call mpi_type_vector(y_dim,N_vert,(2+N_vert)*(2+x_dim),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,x_dim+1,2),1,plane,right,3,&
p(2,1,2),1,plane,left,3,comm2d,status,ierr)
end subroutine conj_exchange
subroutine v_exchange(p,k)
implicit none
real*8, dimension(N_vert+2,x_dim+2,y_dim+2) :: p
integer :: k
call mpi_type_vector(x_dim,N_vert,2+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,2,1+y_dim),1,plane,front,0,&
p(2,2,1),1,plane,back,0,comm2d,status,ierr)
call mpi_type_vector(x_dim,N_vert,2+N_vert,mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,2,2),1,plane,back,1,&
p(2,2,y_dim+2),1,plane,front,1,comm2d,status,ierr)
call mpi_type_vector(y_dim,N_vert,(2+N_vert)*(2+x_dim),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,2,2),1,plane,left,2,&
p(2,x_dim+2,2),1,plane,right,2,comm2d,status,ierr)
call mpi_type_vector(y_dim,N_vert,(2+N_vert)*(2+x_dim),mpi_double_precision,plane,ierr)
call mpi_type_commit(plane,ierr)
call mpi_sendrecv(p(2,x_dim+1,2),1,plane,right,3,&
p(2,1,2),1,plane,left,3,comm2d,status,ierr)
end subroutine v_exchange
subroutine get_ranks
implicit none
integer :: i
if(outcoords(2)>0)then
local_disp=(N_x-(outdims(2)-1)*(N_x/outdims(2)))*N_vert+(outcoords(2)-1)*N_vert*(N_x/outdims(2))
endif
if(outcoords(1) > 0)then
local_disp=local_disp+(N_y-(outdims(1)-1)*(N_y/outdims(1)))*N_x*N_vert+(outcoords(1)-1)*(N_y/outdims(1))*N_vert*N_x
endif
if(myid==0)then
allocate(counts(num_proc),disps(num_proc))
counts=1
endif
call mpi_gather(local_disp,1,mpi_int,disps,1,mpi_int,0,comm2d,ierr)
end subroutine get_ranks
subroutine get_full_array(var)
implicit none
real*8, dimension(N_vert,x_dim,y_dim,7) :: var
integer :: i
do i=1,7
sizes(1)=N_vert; sizes(2)=N_x; sizes(3)=N_y
subsizes(1)=N_vert; subsizes(2)=x_dim; subsizes(3)=y_dim
starts(1)=0; starts(2)=0; starts(3)=0
call mpi_type_create_subarray(3, sizes, subsizes, starts, mpi_order_fortran, &
mpi_double_precision, recvsubarray, ierr)
call mpi_type_commit(recvsubarray,ierr)
extent = sizeof(c)
begin = 0
call mpi_type_create_resized(recvsubarray, begin, extent, resizedrecvsubarray, ierr)
call mpi_type_commit(resizedrecvsubarray,ierr)
!counts=1
call mpi_gatherv(var(1,1,1,i),x_dim*y_dim*N_vert,mpi_double_precision,write_array(:,:,:,i),counts,disps,&
resizedrecvsubarray,0,comm2d,ierr)
enddo
end subroutine get_full_array
subroutine mpi_end
implicit none
call mpi_finalize(ierr)
end subroutine mpi_end
end module mpi_interface