PGI User Forum

[TheMatt]

As I am debugging my code, a thought occurred to me about the code I was looking at. Namely, should I accelerate code (with the pragmas, or perhaps with CUDA at all) that involves exponentiation? Say I have a code fragment like:

[mkcolg]

Hi Matt,

I'm going to guess that the "aa*aa*aa*..." version is a bit faster in this case but you'll most likely want to do some experimentation.

Another thing that you'll want to try experimenting with, is making "ik" the inner most loop. Because of the backward dependency (ik-1), the ik loop needs to be run sequentially. Having it as the outer most loop, it will be run sequentially on the host and launch the CUDA kernel multiple times. Having it as the inner most loop, the sequential section will be run within the CUDA kernel on the GPU.

Though, with the small loop count it may not matter so definitely try it both ways.

Hope this helps,
Mat