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Altera_Forum's avatar
Altera_Forum
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8 years ago

Replication of single work item kernel to increase the performance

Hi Everyone, I have single Work item kernel which consumes less resource on board. Now I want to replicate the same kernel 2 or 4 times on to the board to improve the performance. I have a for ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

There are two version of "num_compute_units()"; one is num_compute_units(X) (one dimensional) which is for ndrange kernels, the other one is num_compute_units(X, Y, Z) (three-dimensional) which is for single work-item autorun kernels that need to be coupled with get_compute_id(). The former is the one that is referenced in the forum thread you mentioned (note that I was talking about single work-group and not single work-item kernels in that thread) and the latter is the one that is mentioned in Altera's documents. There is no way to automatically replicate non-autorun single work-item kernels.

However, in your case, why don't you just partially unroll your loop? Loop unrolling is the most area-efficient way of improving performance.