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Improve CAGRA multi-CTA heuristic: max_iterations #2582

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Improve CAGRA multi-CTA heuristic: max_iterations #2582

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10 changes: 7 additions & 3 deletions cpp/src/neighbors/detail/cagra/search_plan.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -201,9 +201,13 @@ struct search_plan_impl : public search_plan_impl_base {
uint32_t _max_iterations = max_iterations;
if (max_iterations == 0) {
if (algo == search_algo::MULTI_CTA) {
constexpr uint32_t mc_itopk_size = 32;
constexpr uint32_t mc_search_width = 1;
_max_iterations = mc_itopk_size / mc_search_width;
constexpr size_t mc_itopk_size = 32;
const size_t minimum_depth = 16;
const auto effective_itopk_size = raft::ceildiv(itopk_size, mc_itopk_size) * mc_itopk_size;
const auto num_ctas = max(search_width, raft::ceildiv(effective_itopk_size, mc_itopk_size));

_max_iterations = minimum_depth + raft::ceildiv(mc_itopk_size - minimum_depth, num_ctas);
_max_iterations += raft::ceildiv(static_cast<size_t>(topk), mc_itopk_size) - 1;
} else {
_max_iterations = itopk_size / search_width;
}
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