PVF12.8 vs nvs4200M

hi when I compile OPENACC with GPU card NVS4200m in PVF12.8 it
returned an error call to cuMemcpyDtoH returned error 999 Unknow


program laplace
!#ifdef _OPENACC
  use openacc
!#endif
  implicit none
  integer, parameter :: fp_kind=kind(1.0)
  integer, parameter :: n=4096, m=4096, iter_max=1000
  integer :: i, j, iter
  real(fp_kind), dimension (:,:), allocatable :: A, Anew
  real(fp_kind), dimension (:),   allocatable :: y0
  real(fp_kind) :: pi=2.0_fp_kind*asin(1.0_fp_kind), tol=1.0e-5_fp_kind, error=1.0_fp_kind
  real(fp_kind) :: start_time, stop_time
  allocate ( A(0:n-1,0:m-1), Anew(0:n-1,0:m-1) )
  allocate ( y0(0:m-1) )
  A = 0.0_fp_kind
  ! Set B.C.
  y0 = sin(pi* (/ (j,j=0,m-1) /) /(m-1))
  A(0,:)   = 0.0_fp_kind
  A(n-1,:) = 0.0_fp_kind
  A(:,0)   = y0
  A(:,m-1) = y0*exp(-pi)
  
!#if _OPENACC
  call acc_init(acc_device_nvidia)
!#endif
   
  write(*,'(a,i5,a,i5,a)') 'Jacobi relaxation Calculation:', n, ' x', m, ' mesh'

  call cpu_time(start_time)
  iter=0
!$omp parallel do shared(Anew)
  do i=1,m-1
    Anew(0,i)   = 0.0_fp_kind
    Anew(n-1,i) = 0.0_fp_kind
  end do
!$omp end parallel do
!$omp parallel do shared(Anew)
  do i=1,n-1
    Anew(i,0)   = y0(i)
    Anew(i,m-1) = y0(i)*exp(-pi)
  end do
!$omp end parallel do
!$acc data copy(A), create(Anew)
  do while ( error .gt. tol .and. iter .lt. iter_max )
    error=0.0_fp_kind
!$omp parallel do shared(m, n, Anew, A) reduction( max:error )
!$acc kernels loop gang(32), vector(16)
    do j=1,m-2
!$acc loop gang(16), vector(32)
      do i=1,n-2
        Anew(i,j) = 0.25_fp_kind * ( A(i+1,j  ) + A(i-1,j  ) + &
                                     A(i  ,j-1) + A(i  ,j+1) )
        error = max( error, abs(Anew(i,j)-A(i,j)) )
      end do
!$acc end loop
    end do
!$acc end kernels
!$omp end parallel do
    if(mod(iter,100).eq.0 ) write(*,'(i5,f10.6)'), iter, error
    iter = iter +1
!$omp parallel do shared(m, n, Anew, A)
!$acc kernels loop
    do j=1,m-2
!$acc loop gang(16), vector(32)
      do i=1,n-2
        A(i,j) = Anew(i,j)
      end do
!$acc end loop
    end do
!$acc end kernels
!$omp end parallel do
  end do
!$acc end data
  call cpu_time(stop_time)
  write(*,'(a,f10.3,a)')  ' completed in ', stop_time-start_time, ' seconds'
  deallocate (A,Anew,y0)
end program laplace

hi,Mat, this user told me that he update to PVF 12.9,but this question still exists

hi,Mat, this user told me that he update to PVF 12.9,but this question still exists

Hi Sisiy,

I do apologize, I thought I had responded to this user. This is a compiler error having to do with the default schedule for the reduction being mismatched with the user’s schedule. The work around is to use a 16x16 instead of a 16x32 vector or remove the explicit schedule.

!$acc kernels loop gang(32), vector(16)
    do j=1,m-2
!$acc loop gang(16), vector(16)
      do i=1,n-2
        Anew(i,j) = 0.25_fp_kind * ( A(i+1,j  ) + A(i-1,j  ) + &
                                     A(i  ,j-1) + A(i  ,j+1) )
        error = max( error, abs(Anew(i,j)-A(i,j)) )
      end do
    end do
!$acc end kernels



!$acc kernels loop 
    do j=1,m-2
      do i=1,n-2
        Anew(i,j) = 0.25_fp_kind * ( A(i+1,j  ) + A(i-1,j  ) + &
                                     A(i  ,j-1) + A(i  ,j+1) )
        error = max( error, abs(Anew(i,j)-A(i,j)) )
      end do
    end do
!$acc end kernels

Hope this helps,
Mat