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program FWriter
use mpi
use adios2
implicit none
integer(kind=8), dimension(2) :: shape_dims, start_dims, count_dims
real, dimension(:,:), allocatable :: data
integer :: i, j, inx, iny, irank, isize, ierr
! adios2 handlers
type(adios2_adios):: adios
type(adios2_io):: io
type(adios2_variable):: var
type(adios2_engine):: engine
! Launch MPI
call MPI_Init(ierr)
call MPI_Comm_rank(MPI_COMM_WORLD, irank, ierr)
call MPI_Comm_size(MPI_COMM_WORLD, isize, ierr)
! Application variables
inx = 3
iny = 4
allocate( data(inx, iny) )
do j=1,iny
do i=1,inx
data(i,j) = irank * inx * iny + (j-1)*inx + (i-1)
end do
end do
! Variable dimensions
shape_dims(1) = isize * inx
shape_dims(2) = iny
start_dims(1) = irank * inx
start_dims(2) = 0
count_dims(1) = inx
count_dims(2) = iny
! Create adios handler passing the communicator and error flag
call adios2_init(adios, MPI_COMM_WORLD, ierr)
! Declare an IO process configuration inside adios
call adios2_declare_io(io, adios, "FWriter", ierr)
! Defines a variable to be written in bp format
call adios2_define_variable(var, io, "data2D", adios2_type_real, 2, &
shape_dims, start_dims, count_dims, &
adios2_constant_dims, ierr)
! Open in write mode, this launches an engine
call adios2_open(engine, io, "FWriter.bp", adios2_mode_write, ierr)
! Put data contents to bp buffer
call adios2_put(engine, var, data, ierr)
! Closes engine1 and deallocates it, becomes unreachable
call adios2_close(engine, ierr)
call adios2_finalize(adios, ierr)
deallocate(data)
call MPI_Finalize(ierr)
end program FWriter
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