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Tune cub::DeviceTransform for Blackwell #3543

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Jan 28, 2025
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Tune cub::DeviceTransform for Blackwell #3543

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22 changes: 16 additions & 6 deletions cub/cub/device/dispatch/tuning/tuning_transform.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -169,11 +169,11 @@ struct policy_hub<RequiresStableAddress, ::cuda::std::tuple<RandomAccessIterator
};

#ifdef _CUB_HAS_TRANSFORM_UBLKCP
// H100 and H200
struct policy900 : ChainedPolicy<900, policy900, policy300>
template <int BlockSize, int PtxVersion>
struct bulkcopy_policy
{
static constexpr int min_bif = arch_to_min_bytes_in_flight(900);
using async_policy = async_copy_policy_t<256>;
static constexpr int min_bif = arch_to_min_bytes_in_flight(PtxVersion);
using async_policy = async_copy_policy_t<BlockSize>;
static constexpr bool exhaust_smem =
bulk_copy_smem_for_tile_size<RandomAccessIteratorsIn...>(
async_policy::block_threads * async_policy::min_items_per_thread)
Expand All @@ -188,10 +188,20 @@ struct policy_hub<RequiresStableAddress, ::cuda::std::tuple<RandomAccessIterator
static constexpr bool use_fallback =
RequiresStableAddress || !can_memcpy || no_input_streams || exhaust_smem || any_type_is_overalinged;
static constexpr auto algorithm = use_fallback ? Algorithm::prefetch : Algorithm::ublkcp;
using algo_policy = ::cuda::std::_If<use_fallback, prefetch_policy_t<256>, async_policy>;
using algo_policy = ::cuda::std::_If<use_fallback, prefetch_policy_t<BlockSize>, async_policy>;
};

using max_policy = policy900;
struct policy900
: bulkcopy_policy<256, 900>
, ChainedPolicy<900, policy900, policy300>
{};

struct policy1000
: bulkcopy_policy<128, 1000>
, ChainedPolicy<1000, policy1000, policy900>
{};

using max_policy = policy1000;
#else // _CUB_HAS_TRANSFORM_UBLKCP
using max_policy = policy300;
#endif // _CUB_HAS_TRANSFORM_UBLKCP
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