Copy a 2D array from host to device

Accelerated Computing HPC Compilers Legacy PGI Compilers
#1

Hello. I allocated memory for a 2D array using

int **Ints;
Ints=(int**)malloc(M*sizeof(int*));
for(j=0;j<M;j++){
Ints[j]=(int*)malloc(N*sizeof(int));
}

where Ints is a global int pointer. The allocation is done in a function. The copy is done in another function

#pragma acc data copy(Ints)

but i get this message.
“PGCC-S-0155-Cannot determine bounds for array Ints”

What could be the problem???

#2

Hi kspan,

“Ints” is an unbounded pointer so the compiler doesn’t know it’s shape. To fix, add the starting element and the number of elements to copy. For example:

#pragma acc data copy(Ints[0:M][0:N])

For details see the OpenACC best practices guide, in particular chapter four’s section on “Shaping Arrays”.




Hope this helps,
Mat

#3

mkcolg, I did what you said and it worked. Thanks mate