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Support zero-copy for low-latency combine

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Chenggang Zhao
2025-03-18 15:41:50 +08:00
parent 82dcf48fd3
commit dcaf73e5ff
7 changed files with 80 additions and 28 deletions
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3
csrc/kernels/api.cuh
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@@ -147,7 +147,8 @@ void combine(void* combined_x,
int* next_clean, int num_next_clean_int,
int num_combined_tokens, int hidden, int num_max_dispatch_tokens_per_rank,
int num_topk, int num_experts, int rank, int num_ranks,
void* workspace, cudaStream_t stream, int phases);
void* workspace, cudaStream_t stream,
int phases, bool zero_copy);
} // namespace internode_ll

10
csrc/kernels/internode_ll.cu
View File

@@ -353,7 +353,7 @@ combine(void* combined_x,
int num_combined_tokens, int hidden, int num_topk,
int num_max_dispatch_tokens_per_rank,
int num_experts, int rank, int num_ranks,
int phases) {
int phases, bool zero_copy) {
const auto sm_id = static_cast<int>(blockIdx.x);
const auto num_sms = static_cast<int>(gridDim.x);
const auto thread_id = static_cast<int>(threadIdx.x);
@@ -420,7 +420,8 @@ combine(void* combined_x,
UNROLLED_WARP_COPY(7, lane_id, hidden_bf16_int4, dst_int4_ptr, x_int4, ld_nc_global, st_na_global);
} else {
const auto buf_int4_ptr = reinterpret_cast<int4*>(buf_ptr);
UNROLLED_WARP_COPY(7, lane_id, hidden_bf16_int4, buf_int4_ptr, x_int4, ld_nc_global, st_na_global);
if (not zero_copy)
UNROLLED_WARP_COPY(7, lane_id, hidden_bf16_int4, buf_int4_ptr, x_int4, ld_nc_global, st_na_global);
nvshmemi_ibgda_put_nbi_warp(dst_ptr, buf_ptr, hidden * sizeof(nv_bfloat16), dst_rank, local_expert_idx, lane_id, token_idx - offset);
}
}
@@ -500,7 +501,8 @@ void combine(void* combined_x,
int* next_clean, int num_next_clean_int,
int num_combined_tokens, int hidden, int num_max_dispatch_tokens_per_rank,
int num_topk, int num_experts, int rank, int num_ranks,
void* workspace, cudaStream_t stream, int phases) {
void* workspace, cudaStream_t stream,
int phases, bool zero_copy) {
constexpr int kNumWarpsPerGroup = 10;
constexpr int kNumWarpGroups = 3;
constexpr int kNumMaxTopk = 9;
@@ -524,7 +526,7 @@ LAUNCH_KERNEL(&cfg, combine_func, \
num_combined_tokens, hidden, num_topk, \
num_max_dispatch_tokens_per_rank, \
num_experts, rank, num_ranks, \
phases); } break
phases, zero_copy); } break
SETUP_LAUNCH_CONFIG(num_sms, num_warps * 32, stream);
SWITCH_HIDDEN(COMBINE_LAUNCH_CASE);