last element of array

shadi · March 30, 2011, 7:24pm

Hi,

Anyone knows how can I just copy the last element of an array from GPU to CPU?

Thanks,
Shadi

seibert · March 30, 2011, 9:09pm

You can do pointer arithmetic on device pointers from the host (just don’t dereference them!), so this is totally valid:

cudaMemcpy(h_array, d_array + n - 1, sizeof(float), cudaMemcpyDeviceToHost)

where n is the number of entries in your array, and I’ve assumed it is an array of floats.

shadi · March 30, 2011, 9:28pm

You can do pointer arithmetic on device pointers from the host (just don’t dereference them!), so this is totally valid:
cudaMemcpy(h_array, d_array + n - 1, sizeof(float), cudaMemcpyDeviceToHost)
where n is the number of entries in your array, and I’ve assumed it is an array of floats.

Thanks a lot