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[Fix] enable swap_ab for pplx problem size computation (#22991)

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Signed-off-by: Shixian Cui <shixian@amazon.com>
Co-authored-by: Shixian Cui <shixian@amazon.com>
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shixianc 2025-08-15 14:02:12 -07:00 committed by GitHub
parent 8a87cd27d9
commit 7f89ed248f
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GPG Key ID: B5690EEEBB952194
1 changed files with 32 additions and 13 deletions
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45
csrc/quantization/cutlass_w8a8/moe/moe_data.cu
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@ -161,6 +161,7 @@ void get_cutlass_moe_mm_data_caller(
topk_ids.size(1));
}
template <bool SWAP_AB>
__global__ void compute_pplx_data(int32_t* expert_offsets,
int32_t* problem_sizes1,
int32_t* problem_sizes2,
@ -168,14 +169,23 @@ __global__ void compute_pplx_data(int32_t* expert_offsets,
const int padded_m, const int n,
const int k) {
int expert_idx = threadIdx.x;
expert_offsets[expert_idx] = expert_idx * padded_m;
problem_sizes1[expert_idx * 3] = expert_num_tokens[expert_idx];
problem_sizes1[expert_idx * 3 + 1] = 2 * n;
problem_sizes1[expert_idx * 3 + 2] = k;
problem_sizes2[expert_idx * 3] = expert_num_tokens[expert_idx];
problem_sizes2[expert_idx * 3 + 1] = k;
problem_sizes2[expert_idx * 3 + 2] = n;
if constexpr (!SWAP_AB) {
problem_sizes1[expert_idx * 3] = expert_num_tokens[expert_idx];
problem_sizes1[expert_idx * 3 + 1] = 2 * n;
problem_sizes1[expert_idx * 3 + 2] = k;
problem_sizes2[expert_idx * 3] = expert_num_tokens[expert_idx];
problem_sizes2[expert_idx * 3 + 1] = k;
problem_sizes2[expert_idx * 3 + 2] = n;
} else {
problem_sizes1[expert_idx * 3] = 2 * n;
problem_sizes1[expert_idx * 3 + 1] = expert_num_tokens[expert_idx];
problem_sizes1[expert_idx * 3 + 2] = k;
problem_sizes2[expert_idx * 3] = k;
problem_sizes2[expert_idx * 3 + 1] = expert_num_tokens[expert_idx];
problem_sizes2[expert_idx * 3 + 2] = n;
}
}
void get_cutlass_pplx_moe_mm_data_caller(torch::Tensor& expert_offsets,
@ -187,10 +197,19 @@ void get_cutlass_pplx_moe_mm_data_caller(torch::Tensor& expert_offsets,
const int64_t n, const int64_t k) {
auto stream = at::cuda::getCurrentCUDAStream(expert_offsets.device().index());
compute_pplx_data<<<1, num_local_experts, 0, stream>>>(
static_cast<int32_t*>(expert_offsets.data_ptr()),
static_cast<int32_t*>(problem_sizes1.data_ptr()),
static_cast<int32_t*>(problem_sizes2.data_ptr()),
static_cast<const int32_t*>(expert_num_tokens.data_ptr()), padded_m, n,
k);
if (num_local_experts * padded_m > SWAP_AB_THRESHOLD) {
compute_pplx_data<false><<<1, num_local_experts, 0, stream>>>(
static_cast<int32_t*>(expert_offsets.data_ptr()),
static_cast<int32_t*>(problem_sizes1.data_ptr()),
static_cast<int32_t*>(problem_sizes2.data_ptr()),
static_cast<const int32_t*>(expert_num_tokens.data_ptr()), padded_m, n,
k);
} else {
compute_pplx_data<true><<<1, num_local_experts, 0, stream>>>(
static_cast<int32_t*>(expert_offsets.data_ptr()),
static_cast<int32_t*>(problem_sizes1.data_ptr()),
static_cast<int32_t*>(problem_sizes2.data_ptr()),
static_cast<const int32_t*>(expert_num_tokens.data_ptr()), padded_m, n,
k);
}
}